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quiz4spr01

# quiz4spr01 - ENSC 3313 Spring 2001.nswer 1 anv 4 Questions...

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5'CI o~ Quiz 4 Name ENSC 3313, Spring 2001 .nswer anv 4 Questions onlv, 1 point each 1. A ~ tensile test specimen of gauge length 10 inches and width 2.5 inches was cut from plate 0.5 inches thick. The Joad- elongation plot is as shown. Calculate the a) elastic modulus, b) yield strength, c) tensile strength, d) % elongation. The width = 2.5", the thickness = 0.5". Therefore the cross sectional area = 1.25 in2. Hence, load/1.25 = Stress. The gauge length = 10"; hence strain = elongation /10. a) E -(7 ,000/1.25)/(0.01/1 0) -5.6 x 106 psi b) YS -9,000/1.25- UQQ psi c) TS -14,000/1.25 -11.200psi d) % Elongation -(0.092/10)100, -~ The temperature is 14 °K. This plot is inappropriate for a regular steel. Why? 2 150 This plot is for a ductile metal. Regular steels are BCC and brittle at low temperatures. (J (ksi) (Recollect overhead projector diagram 10-2, 0.6 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

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• Fall '11
• staff
• Tensile strength, Tensile Test Specimen, gauge length, probable slip plane, brittle cleavage crack, probable slip direction

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quiz4spr01 - ENSC 3313 Spring 2001.nswer 1 anv 4 Questions...

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