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8 Cards in this Set
- Front
- Back
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18.1 Which of the following are bulk deformation processes (three correct answers): (a) bending, (b) deepdrawing, (c) extrusion, (d) forging, (e) rolling, and (f) shearing? |
Answer. (c), (d), and (e). |
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18.2 Which of the following is typical of the starting work geometry in sheet metal processes: (a) highvolume-to-area ratio or (b) low volume-to-area ratio? |
Answer. (b). |
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18.3 The flow curve expresses the behavior of a metal in which of the following regions of thestress-strain curve: (a) elastic region or (b) plastic region? |
Answer. (b). |
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18.4 The average flow stress is the flow stress multiplied by which of the following factors: (a) n, (b)(1+n), (c) 1/n, or (d) 1/(1+n), where n is the strain-hardening exponent? |
Answer. (d). |
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18.5 Hot working of metals refers to which one of the following temperature regions relative to themelting point of the given metal on an absolute temperature scale: (a) room temperature, (b) 0.2Tm,(c) 0.4Tm, or (d) 0.6Tm? |
Answer. (d). |
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18.6 Which of the following are advantages and characteristics of hot working relative to cold working(four correct answers): (a) fracture of workpart is less likely, (b) friction is reduced, (c) increasedstrength properties, (d) isotropic mechanical properties, (e) less overall energy is required, (f) lowerdeformation forces is required, (g) more significant shape changes are possible, and (h) strain-ratesensitivity is reduced? |
Answer. (a), (d), (f), and (g). |
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18.7 Increasing strain rate tends to have which one of the following effects on flow stress during hotforming of metal: (a) decreases flow stress, (b) has no effect, or (c) increases flow stress? |
Answer. (c). |
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18.8 The coefficient of friction between the part and the tool in cold working tends to be (a) higher, (b)lower, or (c) no different relative to its value in hot working? |
Answer. (b). |
