Material Science homework 1. _______ is stress computed on the load divided by t

Question

Material Science homework

1. _______ is stress computed on the load divided by the initial cross sectional area. 2. On an engineering stress - strain curve, the onset of plastic instability occurs at _______. 3. The ability of a material to resist penetration is ___________. 4. When the applied stress exceeds a critical value called the __________, deformation becomes permanent. 1. The onset of necking is observed in a (n) stress - strain curve. 2. As the hardness of a material increases, the diameter of the hardness indentation decreases/increases. 3. The slope of a stress - strain curve in the elastic region is generally ceramic material than a metal. 4. The fracture stress in compression is larger/smaller than the fracture stress in tension for a brittle ceramic. 5. The upper and lower yield point is observed in alloys containing interstitials/pure materials.

Explanation / Answer

Part - A

1) Engineering stress/Nominal stress

2) Max load i.e., max stress. (Generally, the strain at the maximum load marks the onset of plastic instability.)

3) Hardness

4) Elastic limit

Part - B

1) Engineering stress

2) Decreases

3) Less

4) Larger

5) Alloys containing interstitials

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