quiz4spr2000 - 7 Name cfw_s~ ENGSC 3313, Spring 2000 Quiz4...

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7 Name Answer anv 4 Questions only, 1 point each .1. Mechanical properties matter. Handbooks will quote at least 4 properties obtained from a tensile test. Name 4! yield strength tensile strength elastic modulus % elongation --and maybe % reduction in area. I showed this diagram on the overhead projector. State 4 features that it (supposedly) illustrates. 2. STEELS I. 2. 3. 4. 5. 6. Steels go brittle at low temperature; The elastic modulus decreases as temperature increases. The yield strength, likewise. The tensile strength, likewise. The ductility increases as temperature increases. There is no strain hardening at "high" temperatures. STRESS I' I c:. . 1.1 ; t T STRAJN Show that in a rod extended to twice its length in tension, or compressed to half its length, the true strains but not the engineering strain are equivalent. 3. The engineering strains would be (for an initial length x) O.5x-x=~ x comDresslon ~=ill x tension The true strains would be . comQression
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quiz4spr2000 - 7 Name cfw_s~ ENGSC 3313, Spring 2000 Quiz4...

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