Question: A solid round bar of aluminum having diameter d (see figure) is compressed by an axial force P = 60 k. The bar has pinned

A solid round bar of aluminum having diameter d (see figure) is compressed by an axial force P = 60 k. The bar has pinned supports and is made of alloy 2014-T6.
(a) If the diameter d = 2.0 in., what is the maximum allowable length Lmax of the bar?
(b) If the length L = 30 in., what is the minimum required diameter dmin?

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