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Discussion

Under combined bending and torsion, the critical point of a section is found by

  • A.Taking whichever stress is larger
  • B.Ignoring the smaller of the two
  • C.Combining them with a failure criterion
  • D.Adding the two stresses arithmetically

Answer: C

Direct stress from bending and shear stress from torsion act together, and a criterion such as maximum shear stress or von Mises resolves them into an equivalent stress. Simply adding them is dimensionally reasonable but physically wrong.

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