An aircraft strut is l.8 m long, has pinned ends, and is made of 7075-T6 aluminum alloy. T...

An aircraft strut is l.8 m long, has pinned ends, and is made of 7075-T6 aluminum alloy. The cross-sectional dimensions ate shown in Figure P12.14. A support at mid length prevents deflection in the x direction but does not prevent deflection in the y direction or rotation of the column. Assume that the proportional limit of the alun1inum alloy is 0.9 times the yield stress.

a. Determine the critical buckling load using Euler's formula.

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b. Verify that use of Euler's formula is justified. That is, verify that the critical stress for the column is less than the proportional limit.

FIGURE P12.14