In the following problem, unless otherwise noted, assume for steel that the modulus of elasticity is 30,000 ksi (207 × 103 MPa), the proportional limit is 48 ksi (331 MPa), and the yield stress is 50 ksi (345 MPa).
A pin-connected axially loaded steel bar is used as a compression member. The bar has a rectangular cross section 1 in. by 2 in. The proportional limit is 30,000 psi. Calculate the minimum length L for Euler’s formula to be applicable. In addition, calculate the critical stress and the critical load if the length of the bar is 5 ft.
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