Question
Which of the following statements is true?
The correct answer is
Shear stress on principal planes is zero.
Principal Planes Defined
Principal planes are specific orientations within a material under stress where the shear stresses are zero. Only normal stresses, known as principal stresses, act on these planes.
Shear Stress on Principal Planes
- By definition, principal planes are the planes on which the shear stress is zero.
- On these planes, the resultant stress is purely normal (either tensile or compressive).
- Therefore, the statement "Shear stress on principal planes is zero" is the defining characteristic.
Conclusion
The key property of principal planes is the absence of shear stress. Hence, shear stress is zero on these planes.
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