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Engineering Material

Test 2 Short Answer

QuestionAnswer
Complete the phrase: Because macroscopic plastic deformation corresponds to the motion of large numbers of dislocations, the ability of a material to plastically deform depends upon the capability of it dislocations to move
Name the 4 strengthening mechanisms for metals: Cold Working Grain Size Reduction Precipitation-Hardening Solid-Solution Strengthening
Explain why materials that behave in a ductile fashion at room temperature may behave in a brittle fashion at colder temperatures. The ductile brittle transition temperature (DBBT) is the minimum temperature in which a given material has the ability to absorb a specific amount of energy without fracturing. As temperatures decrease, a material's ability to deform in a ductile matter.
Explain why brittle fracture is undesirable (syntax in answer is mehh but the answer was right...) Because It happens without warning, and spectacularly, without warning, sometimes explosively or destructively so.
Explain the stages of elastic and plastic deformation during a simple tensile test. Refer to the figure below. (has important labels) Important labels to remember: Tensile Strength line Axes Labels (sigma, epsilon) Local-Global vertical line Elastic, Plastic Necking Load is applied, microvoids form, then coalesce, necking begins, shearing at edge, Fracture
Created by: jjardor
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