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For pure shear (σ_x = σ_y = 0, τ_xy = τ), principal stresses are:
AZero
BJust τ
CBoth +τ and -τ at 45°
D+τ and -τ
Answer & Solution
Correct answer: D. +τ and -τ
Pure shear: principal stresses ±τ on 45° planes. Mohr's circle: centered at origin, radius τ. Hence pure shear is equivalent to biaxial tension-compression on 45° planes. Important: pure shear test causes failure on diagonal lines.
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