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Maximum shear stress occurs on planes oriented at ___ to principal planes:

A0°
B90°
C30°
D45°
Answer & Solution
Correct answer: D. 45°
Max shear plane bisects principal directions: 45° from principal planes. Magnitude τ_max = (σ_1 - σ_2)/2 = R (radius of Mohr's circle). At max shear plane, normal stress = (σ_1 + σ_2)/2 (not zero in general).
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