QUIZ - QUIZ "Introduction to Materials Science and...

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QUIZ “Introduction to Materials Science and Engineering” National United University, Dept. of Materials Science and Engineering. 2007/5/4 Class: Name: ID#: 1. Answer the following questions briefly; (10%) (i). Explain (a) why there may be significant scatter in the fracture strength for some given ceramic material, and (b) why fracture strength increases with decreasing specimen size. Answer: (a) There may be significant scatter in the fracture strength for some given ceramic material because the fracture strength depends on the probability of the existence of a flaw that is capable of initiating a crack; this probability varies from specimen to specimen of the same material. (b) The fracture strength increases with decreasing specimen size because as specimen size decreases, the probably of the existence of a flaw of that is capable of initiating a crack diminishes. (ii). Describe (a) a metal fatigue failure, and (b) what two distinct types of surface areas are usually recognized on a fatigue failure surface?. Answer:
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QUIZ - QUIZ "Introduction to Materials Science and...

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