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  3. When using multi linear plasticity model, is it possible for von Mises or max principal stress to go beyond ultimate stress?

When using multi linear plasticity model, is it possible for von Mises or max principal stress to go beyond ultimate stress?

Tagged: 2019 R2, materials, mechanical, Nonlinear mechanics, plasticity, structural-mechanics
    • January 25, 2023 at 7:34 am
      FAQFAQ
      Participant

      Equivalent stress must follow the stress-strain curve. For metal plasticity by definition we use the von Mises equation (a.k.a. equivalent stress) to relate the stress tensor to a scalar quantity that we match to the input multilinear stress-strain curve. Maximum principal stress will not follow the stress-strain curve. It is definitely possible that maximum principal stress will be above ultimate stress if the hydrostatic component of stress is large.

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