quiz4fall00 - .~ \~ ENSC 3313,Fal12000 .nswer 1. anv Quiz 4...

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..~ \~ ENSC 3313, Fal12000 Quiz 4 Name .nswer anv 4 guestions only, 1 point each 1. A .flm tensile test specimen of gauge length 4 inches and width 1.0 inches was cut from sheet 0.2 inches thick. The lQi!.4: elongation plot is as shown. Calculate the a) elastic modulus, b) yield strength, c) tensile strength, d) % elongation (4"). The width = 1 ", the thickness = 0.2". Therefore the cross sectional area = 0.22 in. Hence, load x 5 = Stress. The gauge length = 4" ; hence strain = elongation/4. a) E = 35 ooo/~ -14 x 106 psi , 4 b) YS -45. .QQ.Q psi c) TS -70.000 psi d) % Elongation -(0.092/4)100, -~ Forces of 500, 1500 and 3000 kgf are noted. 2. This is a text plot that I also showed on the overhead projector. What is the 'y' axis label? Why the step r~ 01 I .~ Elastic modulus! 140 '1 The abrupt discontinuity coITesponds to a phase (structure) change ---actually BCC to FCC. 30 ~ tU "4) - 0 "' = = "'8 ~ 100 101 3. I .~
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quiz4fall00 - .~ \~ ENSC 3313,Fal12000 .nswer 1. anv Quiz 4...

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