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The von Mises criterion predicts yielding when

  • A.The strain energy reaches zero
  • B.Distortion energy reaches its yield value
  • C.The largest principal stress reaches yield
  • D.The hydrostatic stress reaches yield

Answer: B

Distortion energy rather than total strain energy governs, which is why a purely hydrostatic state does not cause yielding however large. It agrees well with test data for ductile metals and is slightly less conservative than Tresca.

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