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Q: Shear stress is___stress.
  • A. Bending
  • B. Normal
  • C. Proof
  • D. Tangential
Correct Answer: Option D - ∎ Shear stress acts tangentially to the surface of material element. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off the section, then the stress induced is called shear stress. ∎ Proof stress is the stress necessary to cause a non-proportional or permanent extension equal to a defined percentage (say 0.1 or 0.2%) of gauge length.
D. ∎ Shear stress acts tangentially to the surface of material element. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off the section, then the stress induced is called shear stress. ∎ Proof stress is the stress necessary to cause a non-proportional or permanent extension equal to a defined percentage (say 0.1 or 0.2%) of gauge length.

Explanations:

∎ Shear stress acts tangentially to the surface of material element. When a body is subjected to two equal and opposite forces, acting tangentially across the resisting section, as a result of which the body tends to shear off the section, then the stress induced is called shear stress. ∎ Proof stress is the stress necessary to cause a non-proportional or permanent extension equal to a defined percentage (say 0.1 or 0.2%) of gauge length.