Practice Problem 9-2

Practice Problem 9-2

Given: During a field test, an aluminum machine component fails when under a stress state of
s_x = 32 ksi, s_y = 2.0 ksi, and t_xy= 9 ksi. Assume plane stress conditions.

Req'd: Based on the maximum distortion energy theory (von Mises), determine the yield strength of the material S_y.

Sol'n: Based on the von Mises Theory, failure occurs when the von Mises Stress equals the yield strength. From the data, the von Mises stress is:

Therefore, the yield stress of the material is:

S_y = s_o = 34.7 ksi

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Updated: 05/21/09 DJD