899 lines
42 KiB
Plaintext
899 lines
42 KiB
Plaintext
处理第 1/832 条数据...
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[
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{
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"question": "How does a temperature indicator made from a coiled metal strip work when the temperature increases?",
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"answer": "Bimetallic materials are produced by bonding two materials having different coefficients of thermal expansion to one another, forming a laminar composite. When the temperature changes, one of the materials will expand or contract more than the other material. This difference in expansion or contraction causes the bimetallic material to change shape; if the original shape is that of a coil, then the device will coil or uncoil, depending on the direction of the temperature change."
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},
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{
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"question": "From what kind of material would the temperature indicator be made?",
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"answer": "The temperature indicator is made from bimetallic materials, which consist of two materials with different coefficients of thermal expansion bonded together."
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},
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{
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"question": "What are the important properties that the material in the temperature indicator must possess?",
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"answer": "The two materials must have very different coefficients of thermal expansion and should have high enough modulus of elasticity so that no permanent deformation of the material occurs."
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}
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]
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[
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{
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"question": "What properties should the head of a carpenter's hammer possess?",
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"answer": "The striking face and claws of the hammer should be hard-the metal should not dent or deform when driving or removing nails. Yet these portions must also possess some impact resistance, particularly so that chips do not flake off the striking face and cause injuries."
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},
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{
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"question": "How would you manufacture a hammer head?",
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"answer": "The head for a carpenter's hammer is produced by forging, a metalworking process; a simple steel shape is heated and formed in several steps while hot into the required shape. The head is then heat treated to produce the required mechanical and physical properties."
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}
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]
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[
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{
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"question": "Using the densities and atomic weights, calculate the number of atoms per cubic centimeter in lead.",
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"answer": "3.3 × 10^22 atoms/cm^3"
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},
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{
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"question": "Using the densities and atomic weights, calculate the number of atoms per cubic centimeter in lithium.",
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"answer": "4.63 × 10^22 atoms/cm^3"
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}
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]
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```json
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[
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{
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"question": "In order to plate a steel part having a surface area of 200 in.² with a 0.002 in. thick layer of nickel, how many atoms of nickel are required?",
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"answer": "5.98 × 10²³ atoms"
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},
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{
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"question": "In order to plate a steel part having a surface area of 200 in.² with a 0.002 in. thick layer of nickel, how many moles of nickel are required?",
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"answer": "0.994 mol ni required"
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}
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]
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```
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[
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{
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"question": "Calculate the atomic radius in cm for a BCC metal with a0=0.3294 nm and one atom per lattice point.",
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"answer": "1.426 x 10^-8 cm"
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},
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{
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"question": "Calculate the atomic radius in cm for an FCC metal with a0=4.0862 A and one atom per lattice point.",
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"answer": "1.4447 x 10^-8 cm"
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}
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]
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处理第 12/832 条数据...
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```json
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[
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{
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"question": "Determine the crystal structure for a metal with a0=4.9489 Å, r=1.75 Å and one atom per lattice point.",
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"answer": "fcc."
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},
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{
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"question": "Determine the crystal structure for a metal with a0=0.42906 nm, r=0.1858 nm and one atom per lattice point.",
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"answer": "bcc."
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}
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]
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```
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```json
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[
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{
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"question": "The density of potassium, which has the BCC structure and one atom per lattice point, is 0.855 g/cm³. The atomic weight of potassium is 39.09 g/mol. Calculate the lattice parameter.",
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"answer": "5.3355 × 10⁻⁸ cm"
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},
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{
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"question": "The density of potassium, which has the BCC structure and one atom per lattice point, is 0.855 g/cm³. The atomic weight of potassium is 39.09 g/mol. Calculate the atomic radius of potassium.",
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"answer": "2.3103 × 10⁻⁸ cm"
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}
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]
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```
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[
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{
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"question": "The density of thorium, which has the FCC structure and one atom per lattice point, is 11.72 g/cm³. The atomic weight of thorium is 232 g/mol. Calculate the lattice parameter.",
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"answer": "5.0856 × 10⁻⁸ cm"
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},
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{
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"question": "The density of thorium, which has the FCC structure and one atom per lattice point, is 11.72 g/cm³. The atomic weight of thorium is 232 g/mol. Calculate the atomic radius of thorium.",
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"answer": "1.7980 × 10⁻⁸ cm"
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}
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]
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处理第 18/832 条数据...
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```json
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[
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{
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"question": "Bismuth has a hexagonal structure, with a0=0.4546 nm and c0=1.186 nm. The density is 9.808 g/cm3 and the atomic weight is 208.98 g/mol. Determine the volume of the unit cell.",
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"answer": "0.21226 nm3 or 2.1226 x 10^-22 cm3"
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},
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{
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"question": "Bismuth has a hexagonal structure, with a0=0.4546 nm and c0=1.186 nm. The density is 9.808 g/cm3 and the atomic weight is 208.98 g/mol. Determine the number of atoms in each unit cell.",
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"answer": "6 atoms/cell"
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}
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]
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```
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[
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{
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"question": "Gallium has an orthorhombic structure, with a0=0.45258 nm, b0=0.45186 nm, and c0=0.76570 nm. The atomic radius is 0.1218 nm. The density is 5.904 g/cm3 and the atomic weight is 69.72 g/mol. Determine the number of atoms in each unit cell.",
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"answer": "8 atoms/cell."
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},
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{
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"question": "Gallium has an orthorhombic structure, with a0=0.45258 nm, b0=0.45186 nm, and c0=0.76570 nm. The atomic radius is 0.1218 nm. The density is 5.904 g/cm3 and the atomic weight is 69.72 g/mol. Determine the packing factor in the unit cell.",
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"answer": "0.387."
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}
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]
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处理第 20/832 条数据...
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```json
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[
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{
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"question": "Beryllium has a hexagonal crystal structure, with a0=0.22858 nm and c0=0.35842 nm. The atomic radius is 0.1143 nm, the density is 1.848 g/cm3, and the atomic weight is 9.01 g/mol. Determine the number of atoms in each unit cell.",
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"answer": "2 atoms/cell."
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},
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{
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"question": "Beryllium has a hexagonal crystal structure, with a0=0.22858 nm and c0=0.35842 nm. The atomic radius is 0.1143 nm, the density is 1.848 g/cm3, and the atomic weight is 9.01 g/mol. Determine the packing factor in the unit cell.",
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"answer": "0.77"
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}
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]
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```
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```json
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[
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{
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"question": "A typical paper clip weighs 0.59 g and consists of BCC iron. Calculate the number of unit cells in the paper clip.",
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"answer": "3.185 x 10^21 cells"
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},
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{
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"question": "A typical paper clip weighs 0.59 g and consists of BCC iron. Calculate the number of iron atoms in the paper clip.",
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"answer": "6.37 x 10^21 atoms"
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}
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]
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```
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```json
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[
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{
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"question": "Determine the planar density for BCC lithium in the (100) plane.",
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"answer": "planar density = 0.0812 x 10^16 points/cm^2"
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},
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{
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"question": "Determine the packing fraction for BCC lithium in the (100) plane.",
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"answer": "packing fraction = 0.589"
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},
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{
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"question": "Determine the planar density for BCC lithium in the (110) plane.",
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"answer": "planar density = 0.1149 x 10^16 points/cm^2"
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},
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{
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"question": "Determine the packing fraction for BCC lithium in the (110) plane.",
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"answer": "packing fraction = 0.833"
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},
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{
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"question": "Determine the planar density for BCC lithium in the (111) plane.",
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"answer": "planar density = 0.0469 x 10^16 points/cm^2"
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},
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{
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"question": "Determine the packing fraction for BCC lithium in the (111) plane.",
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"answer": "packing fraction = 1/2 / 0.866 a0^2 sqrt(3) a0 / 4"
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},
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{
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"question": "Which, if any, of these planes is close packed in BCC lithium?",
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"answer": "there is no close-packed plane in bcc structures."
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}
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]
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```
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```json
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[
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{
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"question": "Determine the minimum radius of an atom that will just fit into the tetrahedral interstitial site in FCC nickel.",
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"answer": "0.2797 \aa"
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},
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{
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"question": "Determine the minimum radius of an atom that will just fit into the octahedral interstitial site in BCC lithium.",
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"answer": "0.629 \aa"
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}
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]
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```
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API调用错误: Invalid \escape: line 4 column 27 (char 170)
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处理第 43/832 条数据...
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[
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{
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"question": "Would you expect BeO to have the sodium chloride, zinc blende, or fluorite structure?",
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"answer": "BeO has the zinc blende structure."
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},
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{
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"question": "Based on the zinc blende structure of BeO, determine the lattice parameter.",
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"answer": "The lattice parameter is 3.8567 Å."
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},
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{
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"question": "Based on the zinc blende structure of BeO, determine the density.",
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"answer": "The density is 2.897 g/cm³."
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},
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{
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"question": "Based on the zinc blende structure of BeO, determine the packing factor.",
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"answer": "The packing factor is 0.684."
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}
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]
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```json
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[
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{
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"question": "Would you expect CsBr to have the sodium chloride, zinc blende, fluorite, or cesium chloride structure?",
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"answer": "CsBr is expected to have the cesium chloride structure."
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},
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{
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"question": "Based on the cesium chloride structure, determine the lattice parameter for CsBr.",
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"answer": "The lattice parameter a0 = 4.1916 Å."
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},
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{
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"question": "Based on the cesium chloride structure, determine the density for CsBr.",
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"answer": "The density ρ = 4.8 g/cm³."
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},
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{
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"question": "Based on the cesium chloride structure, determine the packing factor for CsBr.",
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"answer": "The packing factor pf = 0.693."
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}
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]
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```
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[
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{
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"question": "Sketch the ion arrangement on the (110) plane of ZnS (with the zinc blende structure).",
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"answer": ""
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},
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{
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"question": "Sketch the ion arrangement on the (110) plane of CaF2 (with the fluorite structure).",
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"answer": ""
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},
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{
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"question": "Compare the ion arrangement on the (110) plane of ZnS (with the zinc blende structure) to that on the (110) plane of CaF2 (with the fluorite structure).",
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"answer": ""
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},
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{
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"question": "Calculate the planar packing fraction (ppf) on the (110) plane for ZnS (with the zinc blende structure).",
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"answer": "for zns on the (110) plane, the planar packing fraction (ppf) is 0.492."
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},
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{
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"question": "Calculate the planar packing fraction (ppf) on the (110) plane for CaF2 (with the fluorite structure).",
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"answer": "for caf2 on the (110) plane, the planar packing fraction (ppf) is 0.699."
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},
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{
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"question": "Compare the planar packing fraction on the (110) planes for ZnS (with the zinc blende structure) and CaF2 (with the fluorite structure).",
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"answer": ""
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}
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]
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处理第 46/832 条数据...
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[
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{
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"question": "MgO, which has the sodium chloride structure, has a lattice parameter of 0.396 nm. Determine the planar density and the planar packing fraction for the (111) plane of MgO. What ions are present on this plane?",
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"answer": "(111) plane:\n- planar density (p.d.): 0.1473 x 10^16 points/cm^2\n- planar packing fraction (ppf): 0.202\n- ions present: mg^2+ and o^2-"
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},
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{
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"question": "MgO, which has the sodium chloride structure, has a lattice parameter of 0.396 nm. Determine the planar density and the planar packing fraction for the (222) plane of MgO. What ions are present on this plane?",
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"answer": "(222) plane:\n- planar density (p.d.): 0.1473 x 10^16 points/cm^2\n- planar packing fraction (ppf): 0.806\n- ions present: mg^2+ and o^2-"
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}
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]
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```json
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[
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{
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"question": "The density of a sample of HCP beryllium is 1.844 g/cm^3 and the lattice parameters are a_0=0.22858 nm and c_0=0.35842 nm. Calculate the fraction of the lattice points that contain vacancies.",
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"answer": "0.0008"
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},
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{
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"question": "The density of a sample of HCP beryllium is 1.844 g/cm^3 and the lattice parameters are a_0=0.22858 nm and c_0=0.35842 nm. Calculate the total number of vacancies in a cubic centimeter.",
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"answer": "0.986 x 10^20 vacancies/cm^3"
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}
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]
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```
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处理第 51/832 条数据...
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[
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{
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"question": "BCC lithium has a lattice parameter of 3.5089 × 10^-8 cm and contains one vacancy per 200 unit cells. Calculate the number of vacancies per cubic centimeter.",
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"answer": "1.157 × 10^20 vacancies/cm³"
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},
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{
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"question": "BCC lithium has a lattice parameter of 3.5089 × 10^-8 cm and contains one vacancy per 200 unit cells. Calculate the density of Li.",
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"answer": "0.532 g/cm³"
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}
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]
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[
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{
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"question": "FCC lead has a lattice parameter of 0.4949 nm and contains one vacancy per 500 Pb atoms. Calculate the density.",
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"answer": "the density is 11.335 g/cm3."
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},
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{
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"question": "FCC lead has a lattice parameter of 0.4949 nm and contains one vacancy per 500 Pb atoms. Calculate the number of vacancies per gram of Pb.",
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"answer": "the number of vacancies per gram of pb is 5.82 × 10^18 vacancies/g."
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}
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]
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[
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{
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"question": "Suppose we introduce one carbon atom for every 100 iron atoms in an interstitial position in BCC iron, giving a lattice parameter of 0.2867 nm. For the Fe-C alloy, find the density.",
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"answer": "7.89 g/cm3"
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},
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{
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"question": "Suppose we introduce one carbon atom for every 100 iron atoms in an interstitial position in BCC iron, giving a lattice parameter of 0.2867 nm. For the Fe-C alloy, find the packing factor.",
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"answer": "0.681"
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}
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]
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```json
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[
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{
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"question": "The density of BCC iron is 7.882 g/cm³ and the lattice parameter is 0.2886 nm when hydrogen atoms are introduced at interstitial positions. Calculate the atomic fraction of hydrogen atoms.",
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"answer": "0.004"
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},
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{
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"question": "The density of BCC iron is 7.882 g/cm³ and the lattice parameter is 0.2886 nm when hydrogen atoms are introduced at interstitial positions. Calculate the number of unit cells required on average that contain hydrogen atoms.",
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"answer": "123.5"
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}
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]
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```
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[
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{
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"question": "Suppose one Schottky defect is present in every tenth unit cell of MgO. MgO has the sodium chloride crystal structure and a lattice parameter of 0.396 nm. Calculate the number of anion vacancies per cm3.",
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"answer": "the number of anion vacancies per cm3 is 1.61 × 10^21 vacancies/cm^3."
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},
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{
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"question": "Suppose one Schottky defect is present in every tenth unit cell of MgO. MgO has the sodium chloride crystal structure and a lattice parameter of 0.396 nm. Calculate the density of the ceramic.",
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"answer": "the density of the ceramic is 4.205 g/cm^3."
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}
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]
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[
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{
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"question": "ZnS has the zinc blende structure. If the density is 3.02 g/cm³ and the lattice parameter is 0.59583 nm, determine the number of Schottky defects per unit cell.",
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"answer": "0.0535 defects per unit cell."
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},
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{
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"question": "ZnS has the zinc blende structure. If the density is 3.02 g/cm³ and the lattice parameter is 0.59583 nm, determine the number of Schottky defects per cubic centimeter.",
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"answer": "2.517 × 10²⁰ defects per cm³."
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}
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]
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[
|
||
{
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||
"question": "Calculate the length of the Burgers vector in BCC niobium.",
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"answer": "b = 2.853 \u00c5"
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},
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{
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"question": "Calculate the length of the Burgers vector in FCC silver.",
|
||
"answer": "b = 2.889 \u00c5"
|
||
},
|
||
{
|
||
"question": "Calculate the length of the Burgers vector in diamond cubic silicon.",
|
||
"answer": "b = 3.840 \u00c5"
|
||
}
|
||
]
|
||
处理第 61/832 条数据...
|
||
[
|
||
{
|
||
"question": "A single crystal of an FCC metal is oriented so that the direction is parallel to an applied stress of 5000 psi. Calculate the resolved shear stress acting on the (111) slip plane in the [T slip direction.",
|
||
"answer": "the resolved shear stress acting on the (111) slip plane in the [T slip direction is 0."
|
||
},
|
||
{
|
||
"question": "A single crystal of an FCC metal is oriented so that the direction is parallel to an applied stress of 5000 psi. Calculate the resolved shear stress acting on the (111) slip plane in the [T] slip direction.",
|
||
"answer": "the resolved shear stress acting on the (111) slip plane in the [T] slip direction is 2040 psi (active)."
|
||
},
|
||
{
|
||
"question": "A single crystal of an FCC metal is oriented so that the direction is parallel to an applied stress of 5000 psi. Which slip system(s) will become active first?",
|
||
"answer": "the slip systems that will become active first are λ011 and λ101."
|
||
}
|
||
]
|
||
处理第 62/832 条数据...
|
||
```json
|
||
[
|
||
{
|
||
"question": "A single crystal of a BCC metal is oriented so that the direction is parallel to the applied stress. If the critical resolved shear stress required for slip is 12,000 psi, calculate the magnitude of the applied stress required to cause slip to begin in the [1,-1,1] direction on the (110) slip plane.",
|
||
"answer": "the magnitude of the applied stress required to cause slip to begin in the [1,-1,1] direction is: sigma = infinity"
|
||
},
|
||
{
|
||
"question": "A single crystal of a BCC metal is oriented so that the direction is parallel to the applied stress. If the critical resolved shear stress required for slip is 12,000 psi, calculate the magnitude of the applied stress required to cause slip to begin in the [1,-1,1] direction on the (011) slip plane.",
|
||
"answer": "the magnitude of the applied stress required to cause slip to begin in the [1,-1,1] direction is: sigma = 29,412 psi"
|
||
},
|
||
{
|
||
"question": "A single crystal of a BCC metal is oriented so that the direction is parallel to the applied stress. If the critical resolved shear stress required for slip is 12,000 psi, calculate the magnitude of the applied stress required to cause slip to begin in the [1,-1,1] direction on the (101) slip plane.",
|
||
"answer": "the magnitude of the applied stress required to cause slip to begin in the [1,-1,1] direction is: sigma = 29,412 psi"
|
||
}
|
||
]
|
||
```
|
||
处理第 63/832 条数据...
|
||
```json
|
||
[
|
||
{
|
||
"question": "The strength of titanium is found to be 65,000 psi when the grain size is 17 x 10^-6 m and 82,000 psi when the grain size is 0.8 x 10^-6 m. Determine the constants in the Hall-Petch equation.",
|
||
"answer": "the constants in the hall-petch equation are k = 19.4 psi/sqrt(d) and sigma_o = 60,290 psi."
|
||
},
|
||
{
|
||
"question": "The strength of titanium is found to be 65,000 psi when the grain size is 17 x 10^-6 m and 82,000 psi when the grain size is 0.8 x 10^-6 m. Determine the strength of the titanium when the grain size is reduced to 0.2 x 10^-6 m.",
|
||
"answer": "the strength of the titanium when the grain size is reduced to 0.2 x 10^-6 m is 103,670 psi."
|
||
}
|
||
]
|
||
```
|
||
处理第 64/832 条数据...
|
||
```json
|
||
[
|
||
{
|
||
"question": "For an ASTM grain size number of 8, calculate the number of grains per square inch at a magnification of 100.",
|
||
"answer": "128 grains/in.^2"
|
||
},
|
||
{
|
||
"question": "For an ASTM grain size number of 8, calculate the number of grains per square inch with no magnification.",
|
||
"answer": "1.28 × 10^6 grains/in.^2"
|
||
}
|
||
]
|
||
```
|
||
处理第 65/832 条数据...
|
||
It's a single issue.
|
||
处理第 66/832 条数据...
|
||
It's a single issue.
|
||
处理第 67/832 条数据...
|
||
It's a single issue.
|
||
处理第 68/832 条数据...
|
||
It's a single issue.
|
||
处理第 69/832 条数据...
|
||
It's a single issue.
|
||
处理第 70/832 条数据...
|
||
[
|
||
{
|
||
"question": "The diffusion coefficient for Cr+3 in Cr2O3 is 6x10-15 cm2/s at 727C and is 1x10-9 cm2/s at 1400C. Calculate (a) the activation energy.",
|
||
"answer": "The activation energy q is 59,230 cal/mol."
|
||
},
|
||
{
|
||
"question": "The diffusion coefficient for Cr+3 in Cr2O3 is 6x10-15 cm2/s at 727C and is 1x10-9 cm2/s at 1400C. Calculate (b) the constant D0.",
|
||
"answer": "The constant D0 is 0.055 cm2/s."
|
||
}
|
||
]
|
||
处理第 71/832 条数据...
|
||
[
|
||
{
|
||
"question": "A 0.2-mm thick wafer of silicon is treated so that a uniform concentration gradient of antimony is produced. One surface contains 1 Sb atom per 10^8 Si atoms and the other surface contains 500 Sb atoms per 10^8 Si atoms. The lattice parameter for Si is 5.407 A (Appendix A). Calculate the concentration gradient in (a) atomic percent Sb per cm.",
|
||
"answer": "-0.02495 at% sb/cm"
|
||
},
|
||
{
|
||
"question": "A 0.2-mm thick wafer of silicon is treated so that a uniform concentration gradient of antimony is produced. One surface contains 1 Sb atom per 10^8 Si atoms and the other surface contains 500 Sb atoms per 10^8 Si atoms. The lattice parameter for Si is 5.407 A (Appendix A). Calculate the concentration gradient in (b) Sb atoms/cm^3.cm.",
|
||
"answer": "-1.246 x 10^19 sb atoms/cm^3.cm"
|
||
}
|
||
]
|
||
处理第 72/832 条数据...
|
||
[
|
||
{
|
||
"question": "When a Cu-Zn alloy solidifies, one portion of the structure contains 25 atomic percent zinc and another portion 0.025 mm away contains 20 atomic percent zinc. The lattice parameter for the FCC alloy is 3.63 x 10^-8 cm. Determine the concentration gradient in (a) atomic percent Zn per cm.",
|
||
"answer": "-2000 at% zn/cm"
|
||
},
|
||
{
|
||
"question": "When a Cu-Zn alloy solidifies, one portion of the structure contains 25 atomic percent zinc and another portion 0.025 mm away contains 20 atomic percent zinc. The lattice parameter for the FCC alloy is 3.63 x 10^-8 cm. Determine the concentration gradient in (b) weight percent Zn per cm.",
|
||
"answer": "-2032 wt% zn/cm"
|
||
}
|
||
]
|
||
处理第 73/832 条数据...
|
||
[
|
||
{
|
||
"question": "A 0.001 -in. BCC iron foil is used to separate a high hydrogen gas from a low hydrogen gas at 650^{\circ} C. 5 x 10^8 H atoms/cm^3 are in equilibrium with the hot side of the foil, while 2 x 10^3 H atoms/cm^3 are in equilibrium with the cold side. Determine the concentration gradient of hydrogen.",
|
||
"answer": "-1969 x 10^8 h atoms/cm^3.cm"
|
||
},
|
||
{
|
||
"question": "A 0.001 -in. BCC iron foil is used to separate a high hydrogen gas from a low hydrogen gas at 650^{\circ} C. 5 x 10^8 H atoms/cm^3 are in equilibrium with the hot side of the foil, while 2 x 10^3 H atoms/cm^3 are in equilibrium with the cold side. Determine the flux of hydrogen through the foil.",
|
||
"answer": "0.33 x 10^8 h atoms/cm^2.s"
|
||
}
|
||
]
|
||
API调用错误: Invalid \escape: line 3 column 121 (char 128)
|
||
处理第 74/832 条数据...
|
||
It's a single issue.
|
||
处理第 75/832 条数据...
|
||
It's a single issue.
|
||
处理第 76/832 条数据...
|
||
It's a single issue.
|
||
处理第 77/832 条数据...
|
||
It's a single issue.
|
||
处理第 78/832 条数据...
|
||
It's a single issue.
|
||
处理第 79/832 条数据...
|
||
It's a single issue.
|
||
处理第 80/832 条数据...
|
||
[
|
||
{
|
||
"question": "Iron containing 0.05 % C is heated to 912 degrees C in an atmosphere that produces 1.20 % C at the surface and is held for 24 h. Calculate the carbon content at 0.05 cm beneath the surface if the iron is BCC.",
|
||
"answer": "for bcc iron, the carbon content at 0.05 cm beneath the surface is 0.95 % c."
|
||
},
|
||
{
|
||
"question": "Iron containing 0.05 % C is heated to 912 degrees C in an atmosphere that produces 1.20 % C at the surface and is held for 24 h. Calculate the carbon content at 0.05 cm beneath the surface if the iron is FCC.",
|
||
"answer": "for fcc iron, the carbon content at 0.05 cm beneath the surface is 0.95 % c."
|
||
},
|
||
{
|
||
"question": "Explain the difference in carbon content between BCC and FCC iron under the given conditions.",
|
||
"answer": "faster diffusion occurs in the looser packed bcc structure, leading to the higher carbon content at point x."
|
||
}
|
||
]
|
||
处理第 81/832 条数据...
|
||
It's a single issue.
|
||
处理第 82/832 条数据...
|
||
It's a single issue.
|
||
处理第 83/832 条数据...
|
||
It's a single issue.
|
||
处理第 84/832 条数据...
|
||
It's a single issue.
|
||
处理第 85/832 条数据...
|
||
It's a single issue.
|
||
处理第 86/832 条数据...
|
||
It's a single issue.
|
||
处理第 87/832 条数据...
|
||
It's a single issue.
|
||
处理第 88/832 条数据...
|
||
It's a single issue.
|
||
处理第 89/832 条数据...
|
||
It's a single issue.
|
||
处理第 90/832 条数据...
|
||
[
|
||
{
|
||
"question": "A ceramic part made of MgO is sintered successfully at 1700 degrees C in 90 minutes. To minimize thermal stresses during the process, we plan to reduce the temperature to 1500 degrees C. Which will limit the rate at which sintering can be done: diffusion of magnesium ions or diffusion of oxygen ions?",
|
||
"answer": "diffusion of oxygen is the slower of the two, due to the larger ionic radius of the oxygen."
|
||
},
|
||
{
|
||
"question": "A ceramic part made of MgO is sintered successfully at 1700 degrees C in 90 minutes. To minimize thermal stresses during the process, we plan to reduce the temperature to 1500 degrees C. What time will be required at the lower temperature?",
|
||
"answer": "the time required at the lower temperature is 955 min or 15.9 h."
|
||
}
|
||
]
|
||
处理第 91/832 条数据...
|
||
[
|
||
{
|
||
"question": "A 850-lb force is applied to a 0.15-in. diameter nickel wire having a yield strength of 45,000 psi and a tensile strength of 55,000 psi. Determine whether the wire will plastically deform.",
|
||
"answer": "the wire will plastically deform (48,100 psi)."
|
||
},
|
||
{
|
||
"question": "A 850-lb force is applied to a 0.15-in. diameter nickel wire having a yield strength of 45,000 psi and a tensile strength of 55,000 psi. Determine whether the wire will experience necking.",
|
||
"answer": "no necking will occur (48,100 psi)."
|
||
}
|
||
]
|
||
处理第 92/832 条数据...
|
||
[
|
||
{
|
||
"question": "A force of 100000 N is applied to a 10 mm x 20 mm iron bar having a yield strength of 400 MPa. Determine whether the bar will plastically deform.",
|
||
"answer": "the bar will plastically deform because the applied stress of 500 MPa exceeds the yield strength of 400 MPa."
|
||
},
|
||
{
|
||
"question": "A force of 100000 N is applied to a 10 mm x 20 mm iron bar having a tensile strength of 480 MPa. Determine whether the bar will experience necking.",
|
||
"answer": "the bar will experience necking because the applied stress of 500 MPa exceeds the tensile strength of 480 MPa."
|
||
}
|
||
]
|
||
处理第 93/832 条数据...
|
||
It's a single issue.
|
||
处理第 94/832 条数据...
|
||
[
|
||
{
|
||
"question": "A force of 20,000 N will cause a 1 cm × 1 cm bar of magnesium to stretch from 10 cm to 10.045 cm. Calculate the modulus of elasticity in GPa.",
|
||
"answer": "the modulus of elasticity is 44.4 GPa."
|
||
},
|
||
{
|
||
"question": "A force of 20,000 N will cause a 1 cm × 1 cm bar of magnesium to stretch from 10 cm to 10.045 cm. Calculate the modulus of elasticity in psi.",
|
||
"answer": "the modulus of elasticity is 6.44 × 10^6 psi."
|
||
}
|
||
]
|
||
处理第 95/832 条数据...
|
||
It's a single issue.
|
||
处理第 96/832 条数据...
|
||
It's a single issue.
|
||
处理第 97/832 条数据...
|
||
It's a single issue.
|
||
处理第 98/832 条数据...
|
||
[
|
||
{
|
||
"question": "A 0.4-in. diameter, 12-in-long titanium bar has a yield strength of 50,000 psi, a modulus of elasticity of 16x10^6 psi, and Poisson's ratio of 0.30. Determine the length of the bar when a 500-lb load is applied.",
|
||
"answer": "the final length of the bar is 12.00298 in."
|
||
},
|
||
{
|
||
"question": "A 0.4-in. diameter, 12-in-long titanium bar has a yield strength of 50,000 psi, a modulus of elasticity of 16x10^6 psi, and Poisson's ratio of 0.30. Determine the diameter of the bar when a 500-lb load is applied.",
|
||
"answer": "the final diameter of the bar is 0.39997 in."
|
||
}
|
||
]
|
||
处理第 99/832 条数据...
|
||
```json
|
||
[
|
||
{
|
||
"question": "A three-point bend test is performed on a block of ZrO2 that is 8 in. long, 0.50 in. wide, and 0.25 in. thick and is resting on two supports 4 in. apart. When a force of 400 lb is applied, the specimen deflects 0.037 in. and breaks. Calculate the flexural strength.",
|
||
"answer": "flexural strength = 76,800 psi"
|
||
},
|
||
{
|
||
"question": "A three-point bend test is performed on a block of ZrO2 that is 8 in. long, 0.50 in. wide, and 0.25 in. thick and is resting on two supports 4 in. apart. When a force of 400 lb is applied, the specimen deflects 0.037 in. and breaks. Calculate the flexural modulus, assuming that no plastic deformation occurs.",
|
||
"answer": "flexural modulus = 22.14 × 10^6 psi"
|
||
}
|
||
]
|
||
```
|
||
处理第 100/832 条数据...
|
||
```json
|
||
[
|
||
{
|
||
"question": "A three-point bend test is performed on a block of silicon carbide that is 10 cm long, 1.5 cm wide, and 0.6 cm thick and is resting on two supports 7.5 cm apart. The sample breaks when a deflection of 0.09 mm is recorded. Calculate the force that caused the fracture. The flexural modulus for silicon carbide is 480 GPa. Assume that no plastic deformation occurs.",
|
||
"answer": "the force that caused the fracture is 1327 n."
|
||
},
|
||
{
|
||
"question": "A three-point bend test is performed on a block of silicon carbide that is 10 cm long, 1.5 cm wide, and 0.6 cm thick and is resting on two supports 7.5 cm apart. The sample breaks when a deflection of 0.09 mm is recorded. Calculate the flexural strength. The flexural modulus for silicon carbide is 480 GPa. Assume that no plastic deformation occurs.",
|
||
"answer": "the flexural strength is 276 mpa."
|
||
}
|
||
]
|
||
```
|
||
处理第 101/832 条数据...
|
||
[
|
||
{
|
||
"question": "(a) A thermosetting polymer containing glass beads is required to deflect 0.5 mm when a force of 500 N is applied. The polymer part is 2 cm wide, 0.5 cm thick, and 10 cm long. If the flexural modulus is 6.9 GPa, determine the minimum distance between the supports.",
|
||
"answer": "the minimum distance between the supports is 41 mm."
|
||
},
|
||
{
|
||
"question": "(a) Will the polymer fracture if its flexural strength is 85 MPa? Assume that no plastic deformation occurs.",
|
||
"answer": "the applied stress is 61.5 MPa, which is less than the flexural strength of 85 MPa; the polymer is not expected to fracture."
|
||
}
|
||
]
|
||
处理第 102/832 条数据...
|
||
It's a single issue.
|
||
处理第 103/832 条数据...
|
||
It's a single issue.
|
||
处理第 104/832 条数据...
|
||
It's a single issue.
|
||
处理第 105/832 条数据...
|
||
It's a single issue.
|
||
处理第 106/832 条数据...
|
||
It's a single issue.
|
||
处理第 107/832 条数据...
|
||
It's a single issue.
|
||
处理第 108/832 条数据...
|
||
It's a single issue.
|
||
处理第 109/832 条数据...
|
||
[
|
||
{
|
||
"question": "To survive for one million cycles under conditions that provide for equal compressive and tensile stresses, what is the fatigue strength, or maximum stress amplitude, required?",
|
||
"answer": "the fatigue strength at one million cycles is 22 mpa."
|
||
},
|
||
{
|
||
"question": "What are the maximum stress, the minimum stress, and the mean stress on the part during its use under conditions that provide for equal compressive and tensile stresses?",
|
||
"answer": "the maximum stress is +22 mpa, the minimum stress is -22 mpa, and the mean stress is 0 mpa."
|
||
},
|
||
{
|
||
"question": "What effect would the frequency of the stress application have on the fatigue strength, maximum stress, minimum stress, and mean stress on the part during its use?",
|
||
"answer": "a high frequency will cause heating of the polymer. as the temperature of the polymer increases, the fatigue strength will decrease. if the applied stress is not reduced, then the polymer will fail in a shorter time."
|
||
}
|
||
]
|
||
处理第 110/832 条数据...
|
||
It's a single issue.
|
||
处理第 111/832 条数据...
|
||
It's a single issue.
|
||
处理第 112/832 条数据...
|
||
[
|
||
{
|
||
"question": "Using the data in Figure 7-27 for an iron-chromium-nickel alloy, determine the activation energy \(Q_{r}\) for rupture in the temperature range 980 to \(1090^{\circ} \mathrm{C}\).",
|
||
"answer": "the activation energy \(q_{r}\) is \(117,000 \text{ cal/mol}\)."
|
||
},
|
||
{
|
||
"question": "Using the data in Figure 7-27 for an iron-chromium-nickel alloy, determine the constant \(m\) for rupture in the temperature range 980 to \(1090^{\circ} \mathrm{C}\).",
|
||
"answer": "the constant \(m\) for rupture is \(3.9\)."
|
||
}
|
||
]
|
||
API调用错误: Invalid \escape: line 3 column 119 (char 126)
|
||
处理第 113/832 条数据...
|
||
It's a single issue.
|
||
处理第 114/832 条数据...
|
||
It's a single issue.
|
||
处理第 115/832 条数据...
|
||
[
|
||
{
|
||
"question": "A 2-in.-diameter copper rod is reduced to 1.5 in. diameter, then reduced again to a final diameter of 1 in. Calculate the % CW for this case.",
|
||
"answer": "75%"
|
||
},
|
||
{
|
||
"question": "A 2-in.-diameter copper rod is reduced in one step from 2 in. to a 1 in. diameter. Calculate the % CW for this case.",
|
||
"answer": "75%"
|
||
}
|
||
]
|
||
处理第 116/832 条数据...
|
||
[
|
||
{
|
||
"question": "Suppose that liquid nickel is undercooled until homogeneous nucleation occurs. Calculate the critical radius of the nucleus required. Assume that the lattice parameter of the solid FCC nickel is 0.356 nm.",
|
||
"answer": "the critical radius of the nucleus required is 6.65 x 10^-8 cm."
|
||
},
|
||
{
|
||
"question": "Suppose that liquid nickel is undercooled until homogeneous nucleation occurs. Calculate the number of nickel atoms in the nucleus. Assume that the lattice parameter of the solid FCC nickel is 0.356 nm.",
|
||
"answer": "the number of nickel atoms in the nucleus is 109 atoms."
|
||
}
|
||
]
|
||
处理第 117/832 条数据...
|
||
[
|
||
{
|
||
"question": "Suppose that liquid iron is undercooled until homogeneous nucleation occurs. Calculate the critical radius of the nucleus required. Assume that the lattice parameter of the solid BCC iron is 2.92 Å.",
|
||
"answer": "the critical radius of the nucleus required is 10.128 × 10^(-8) cm."
|
||
},
|
||
{
|
||
"question": "Suppose that liquid iron is undercooled until homogeneous nucleation occurs. Calculate the number of iron atoms in the nucleus. Assume that the lattice parameter of the solid BCC iron is 2.92 Å.",
|
||
"answer": "the number of iron atoms in the nucleus is 350 atoms."
|
||
}
|
||
]
|
||
处理第 118/832 条数据...
|
||
It's a single issue.
|
||
处理第 119/832 条数据...
|
||
It's a single issue.
|
||
处理第 120/832 条数据...
|
||
```json
|
||
[
|
||
{
|
||
"question": "Calculate the fraction of solidification that occurs dendritically when iron nucleates at 10 degrees Celsius undercooling. The specific heat of iron is 5.78 J/cm3·°C.",
|
||
"answer": "0.0333"
|
||
},
|
||
{
|
||
"question": "Calculate the fraction of solidification that occurs dendritically when iron nucleates at 100 degrees Celsius undercooling. The specific heat of iron is 5.78 J/cm3·°C.",
|
||
"answer": "0.333"
|
||
},
|
||
{
|
||
"question": "Calculate the fraction of solidification that occurs dendritically when iron nucleates homogeneously. The specific heat of iron is 5.78 J/cm3·°C.",
|
||
"answer": "all dendritically."
|
||
}
|
||
]
|
||
```
|
||
处理第 121/832 条数据...
|
||
[
|
||
{
|
||
"question": "Calculate the fraction of solidification that occurs dendritically when silver nucleates at 10 degrees Celsius undercooling. The specific heat of silver is 3.25 J/cm^3·°C.",
|
||
"answer": "0.0237"
|
||
},
|
||
{
|
||
"question": "Calculate the fraction of solidification that occurs dendritically when silver nucleates at 100 degrees Celsius undercooling. The specific heat of silver is 3.25 J/cm^3·°C.",
|
||
"answer": "0.337"
|
||
},
|
||
{
|
||
"question": "Calculate the fraction of solidification that occurs dendritically when silver nucleates homogeneously. The specific heat of silver is 3.25 J/cm^3·°C.",
|
||
"answer": "0.842"
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}
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]
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处理第 122/832 条数据...
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[
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{
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||
"question": "A 2-in. cube solidifies in 4.6 min. Calculate (a) the mold constant in Chvorinov's rule. Assume that n=2.",
|
||
"answer": "the mold constant in chvorinov's rule is 41.48 min/in^2."
|
||
},
|
||
{
|
||
"question": "A 0.5 in. x 0.5 in. x 6 in. bar cast under the same conditions. Calculate (b) the solidification time for the bar. Assume that n=2.",
|
||
"answer": "the solidification time for the bar is 0.60 min."
|
||
}
|
||
]
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处理第 123/832 条数据...
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It's a single issue.
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处理第 124/832 条数据...
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[
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{
|
||
"question": "Calculate the diameter of the cylindrical riser required to prevent shrinkage in a 4 in. × 10 in. × 20 in. casting if the H / D of the riser is 1.5.",
|
||
"answer": "the diameter of the riser d ≥ 6.67 in."
|
||
},
|
||
{
|
||
"question": "Calculate the height of the cylindrical riser required to prevent shrinkage in a 4 in. × 10 in. × 20 in. casting if the H / D of the riser is 1.5.",
|
||
"answer": "the height of the riser h ≥ 10 in."
|
||
},
|
||
{
|
||
"question": "Calculate the volume of the cylindrical riser required to prevent shrinkage in a 4 in. × 10 in. × 20 in. casting if the H / D of the riser is 1.5.",
|
||
"answer": "the volume of the riser v ≥ 349 in.^3"
|
||
}
|
||
]
|
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处理第 125/832 条数据...
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||
[
|
||
{
|
||
"question": "Calculate the diameter of the cylindrical riser required to prevent shrinkage in a 1 in. x 6 in. x 6 in. casting if the H/D of the riser is 1.0.",
|
||
"answer": "the diameter of the riser must be at least 2.25 in."
|
||
},
|
||
{
|
||
"question": "Calculate the height of the cylindrical riser required to prevent shrinkage in a 1 in. x 6 in. x 6 in. casting if the H/D of the riser is 1.0.",
|
||
"answer": "the height of the riser must be at least 2.25 in."
|
||
},
|
||
{
|
||
"question": "Calculate the volume of the cylindrical riser required to prevent shrinkage in a 1 in. x 6 in. x 6 in. casting if the H/D of the riser is 1.0.",
|
||
"answer": "the volume of the riser must be at least 8.95 in^3."
|
||
}
|
||
]
|
||
处理第 126/832 条数据...
|
||
[
|
||
{
|
||
"question": "A 4-in-diameter sphere of liquid copper is allowed to solidify, producing a spherical shrinkage cavity in the center of the casting. What is the shrinkage volume and diameter of the shrinkage cavity in the copper casting?",
|
||
"answer": "for copper:\n- shrinkage volume: 1.709 in.^{3}\n- diameter of shrinkage cavity: 1.30 in."
|
||
},
|
||
{
|
||
"question": "A 4-in-diameter sphere of liquid iron is allowed to solidify, producing a spherical shrinkage cavity in the center of the casting. What is the shrinkage volume and diameter of the shrinkage cavity in the iron casting?",
|
||
"answer": "for iron:\n- shrinkage volume: 1.139 in.^{3}\n- diameter of shrinkage cavity: 1.30 in."
|
||
}
|
||
]
|
||
处理第 127/832 条数据...
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||
It's a single issue.
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处理第 128/832 条数据...
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||
[
|
||
{
|
||
"question": "A 2 cm × 4 cm × 6 cm magnesium casting is produced. After cooling to room temperature, what is the volume of the shrinkage cavity at the center of the casting?",
|
||
"answer": "the volume of the shrinkage cavity at the center of the casting is 46.03 cm³."
|
||
},
|
||
{
|
||
"question": "A 2 cm × 4 cm × 6 cm magnesium casting is produced. After cooling to room temperature, what is the percent shrinkage that must have occurred during solidification?",
|
||
"answer": "the percent shrinkage that must have occurred during solidification is 4.1%."
|
||
}
|
||
]
|
||
处理第 129/832 条数据...
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||
[
|
||
{
|
||
"question": "A 2 in. x 8 in. x 10 in. iron casting is produced and, after cooling to room temperature, is found to weigh 43.9 lb. Determine the percent shrinkage that must have occurred during solidification.",
|
||
"answer": "The percent shrinkage that must have occurred during solidification is 3.4%."
|
||
},
|
||
{
|
||
"question": "A 2 in. x 8 in. x 10 in. iron casting is produced and, after cooling to room temperature, is found to weigh 43.9 lb. Determine the number of shrinkage pores in the casting if all of the shrinkage occurs as pores with a diameter of 0.05 in.",
|
||
"answer": "The number of shrinkage pores in the casting is 83,354 pores."
|
||
}
|
||
]
|
||
处理第 130/832 条数据...
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It's a single issue.
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处理第 131/832 条数据...
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It's a single issue.
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处理第 132/832 条数据...
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It's a single issue.
|
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处理第 133/832 条数据...
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