The principal plane in a 2D stressed body is defined as the plane on which:
AShear stress is maximum
BShear stress is zero and normal stress is maximum or minimum
CNormal stress is zero
DBoth normal and shear stresses are equal to zero
Explanation
Principal planes are mutually perpendicular planes on which shear stress is identically zero. The normal stresses acting on these principal planes are called Principal Stresses (major sigma_1 and minor sigma_2).
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