Discussion
For that same skin, the von Mises equivalent stress is nearest to
Answer: D
For combined direct and shear stress, \( \sigma_{vm} = \sqrt{\sigma^2 + 3\tau^2} = \sqrt{40\,000 + 10\,800} = \sqrt{50\,800} = 225 \) MPa. The factor of three on the shear term is what distinguishes the criterion from a naive combination.
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