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Discussion

The Tresca criterion is generally

  • A.Identical to von Mises in every stress state
  • B.Applicable only to brittle materials
  • C.More conservative than von Mises
  • D.Less conservative than von Mises

Answer: C

Tresca works on the maximum shear stress and inscribes a hexagon within the von Mises ellipse, so it predicts yielding a little earlier in most combined states. The two coincide in uniaxial tension and in pure shear differ by about fifteen per cent.

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