1. When you are assigned to design bumpers or shock absorbers for acar, what pro
ID: 1713240 • Letter: 1
Question
1. When you are assigned to design bumpers or shock absorbers for acar, what property of important for you to know? Answer materis 5 pointe 2. As shown in the following conventional or engineering stress-strain disgram,comparing tensile test of three steel specimens: 1018 CF, 1045 CF and 1095 CF (a). which one is the "strongest" steel? (5 points) (b). which one is "softest" steel? (5 points) (c). which one steel doest have the largest "modulus of toughness" (5 points) (d). which one is the "weakest" steel? (5 points) (e). which one is the "stiffest or hardest" steel? (5 points) (1) 1018 CF, 2) 1045 CF.(3) 1095 CF,(4) all the same, (5) none of them (1) 1018 CF, (2) 1045 CF, 3) 1095 CF, (4) all the same, (5) none of them (1) 1018 CF, (2) 1045 CF, (3) 1095 CF, (4) all the same, (5) none of them (1) 1018 CF, (2) 1045 CF, (3) 1095 CF, (4) all the same, (5) none of them (1) 1018 CF, (2) 1045 CF, (3) 1095 CF, (4) all the same, (5) none of them 1096CF -1045CF O18CF Strain (in in 3. Give the following experimental data for the tensile test of a circular steel specimen at vield point by 0.2% off-set axial load=11,150|b Initial 0.505 Fracture 0.404 2.010 2.487 ultimate load-17,510 load at fracture 14.660 load at proportional limit-7,200 strain (in %-0.515 % Calculate the following (5 points for each question from (a) to (h) and 10 points for each from () to (k) (a) Yield stress in psi (b) Ultimate strength in psi (c) Fracture stress in psi (d) Percent Elongation in gage length, in % (e) Percent Reduction in Area at fracture, in % () Is the material ductile? If yes or no, explain why (g) Is the material brittle? If yes or no, explain why (h) True or actual fracture stress in psi (i) Allowable Stress if the Factor of Safety is 3 G) Young's Modulus or Modulus of Elasticity in psi (k) Modulus of Resilience Page 1Explanation / Answer
1. Resilience property is the one we look for. More resilience better spring.
2. a) 1095 CF
b) 1018 CF
c) ALL ARE SAME
d) 1018 CF
e) 1094CF
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