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3313Q4Sp02 - Answer any 4 Questions only 1 point tl Name...

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tl ENSC 3313, Spring 2002 Quiz 4 Name Answer any 4 Questions only, 1 point each A .flill tensile test specimen, of gauge length 2 inches and width 0.5 inches, was cut from a sheet of thickness 0.1 inches. The load-elongation plot is as shown. Calculate a) the elastic modulus, b) yield strength, c) tensile strength, d) % elongation. Cross section area = 0.5 x 0.1 = 0.05 in2 Stress = Load/ Area Gauge length is 2"; strain = elongation/2 a) E = (1500/0.05)/(0.006)/2 = ~ b) YS ~ 2000/0.05- 40,000 psi (approx) c) TS 5800/0.05- 116,000 psi d) % Elongation (0.54/2) lOO = 27% Under what conditions is this an appropriate stress strain curve for a steel? Explain! 2. About no strain hardening, high elongation, and high reduction in area, all indicate that we are in the hot work region, well above the recrystallization temperature. The temperature could be lOOO°C. a / E A tensile specimen (2.5 cm long x 0.25 cm diameter) is stretched uniformly to 3 cm, whereupon it begins to neck under a load of 20,000 N. Calculate the engineering and true stresses and strains at necking.
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