Question $18(2$ points$)$

A material has an endurance limit $(s_n)=54,370$ psi. The shaft is made from cast steel, the desired reliability is $0\mathrm{.}99,$ is subjected to bending stresses, and the size of the shaft is $6\mathrm{.}0$@$.$ What is the modified endurance limit $s_n^{\text{'}}$ in psi?

Your Answer:

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Question $19(2$ points$)$

Bearing $6005$ as described in the table below has a radial load of $500$ lbs on it$.$ The shaft rotates at $2,800rpm.$ Calculate the $L_{10h}$ for the bearing.

Your Answer:

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