General Mechanical

General Mechanical

How can i get a tangent modulus?

    • zzang3132

      Hi. I study mechanical engineering.

      I’m trying to analysis nonlinear structure.

      I have a yield strength and tensile strength value.

      But, when i use bilinear, i need a tangent modulus.

      how can i get the tangent modulus?

      is there a equation or formula?

      please share your skill and information.

    • peteroznewman
      Set the Tangent Modulus to 0.0 for a conservative analysis.
      Once you use Plasticity in the material model, you need to know another material property: Elongation (at Break).
      Elongation is the value of Strain when failure occurs in a simple tensile test.
      Without Plasticity, you may have used Ultimate Tensile Strength to calculate a Safety Factor for the design.
      With Plasticity, and a zero Tangent Modulus, the stress will not go above Yield, so you need a new Safety Factor.
      Safety Factor = Elongation/(Equivalent Total Strain)
      A Safety Factor < 1.0 predicts failure.
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