A column made of 245 TR aluminum (see Figure 12.11) has an equal-leg cross section of thic...

A column made of 245 TR aluminum (see Figure 12.11) has an equal-leg cross section of thickness t = 0.24 nun and leg length h = 12.0 mm (Figure P12.24).

a. Show that the column undergoes local buckling before Euler buckling.

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b. Calculate the average stress in the column at buckling.

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c. Compare the average stress determined in part b to the Euler buckling stress for a column of length 559 mm and pinned ends.

FIGURE 12.11 Buckling loads for local buckling and Euler buckling for columns made of 245 TR aluminum (E = 74.5 GPa).

FIGURE P12.24