Question: The figure shows a formed round-wire cantilever spring subjected to a varying force. The hardness tests made on 50 springs gave a minimum hardness of

The figure shows a formed round-wire cantilever spring subjected to a varying force. The hardness tests made on 50 springs gave a minimum hardness of 400 Brinell. It is apparent from the mounting details that there is no stress concentration. A visual inspection of the springs indicates that the surface finish corresponds closely to a hot-rolled finish. What number of applications is likely to cause failure? Solve using:
(a) Modified Goodman criterion.
(b) Gerbercriterion.

max 40 lbf in D

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a b Eq 221 Sut 05400 200 kpsi Eq 68 Eq 619 Eq 625 Eq 620 S 05200 100 kpsi kas 1442000718 0321 de ... View full answer

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