Discussion
For that same stress state, the larger principal stress is nearest to
Answer: A
The principal stresses are \( \sigma/2 \pm \sqrt{(\sigma/2)^2 + \tau^2} = 40 \pm 50 \), giving \( 90 \) MPa and \( -10 \) MPa. Note that a compressive principal stress appears even though the applied direct stress was wholly tensile.
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