Three metals have the following monotonic properties Metal X Metal Y 10 x 103 Me
ID: 1767394 • Letter: T
Question
Three metals have the following monotonic properties Metal X Metal Y 10 x 103 Metal Z 30 x 103 10.0 120.0 240.0 95 2.995 0.30 0.15 0.0487 0.03 2 x 103 80.0 50 0.69 210.0 Which metal will (a) cyclically soften? (b) cyclically harden? (c) endure the largest completely reversed strain for a life of 102 reversals? (d) endure the 1argest completely reversed strain for a life of 106 reversals? (e) endure the 1argest completely reversed stress (f) have the smallest ratio of o-max fatigue for a life of 106 reversals? strength over completely reversed fatigue strength at 106 reversals?Explanation / Answer
a) cylindrically soften - material X. The material X has got the least young's modulus of 2x103ksi. Ususlly soft materials will have very less young's modulus.
b) cylindrically harden - material Z. The material Z has got the largest young's modulus of 30x103ksi. Ususlly hard materials will have very high young's modulus.
c) Metal Z will have 102 cycles with 0.0487 strain. As the metal is hard it cannot withstand more strain.
d) Metal X will have 106 cycles with a strain of 2.995 cycles. As the metal is soft, it can withstand more strain.
e) Metal Z will have largest fatigue cycles as its fatigue limit is 240ksi.
f) Metal Z has the smallest ratio of 0.03.
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