Calculations for Internal/Strain Energies (Radioss)

Autumn
Autumn Altair Community Member
edited May 2021 in Community Q&A

Hi,

I am curious to know how Radioss calculates the internal/strain energy of solid elements, specifically when MAT LAW 36 (Tabulated Piecewise Linear Elasto-Plastic) is used (if it makes a difference). I couldn't seem to find what I was looking for in the Theory Manual, but if it is there and I simply missed it, it would be nice to know.

Thank you in advance for your time and help.

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Answers

  • Rogerio Nakano_21179
    Rogerio Nakano_21179 New Altair Community Member
    edited May 2021

    Hi

    I did not find the equation either , but  the expression would be some like:

    the "integral (sigma*eps).d_eps" , that is deformation energy density, and this value is multiplied by the volume of element to have the deformation (or internal) energy.

     

    I hope this is helpful

    Regards

  • Autumn
    Autumn Altair Community Member
    edited May 2021
    Rogerio Nakano_21179 said:

    Hi

    I did not find the equation either , but  the expression would be some like:

    the "integral (sigma*eps).d_eps" , that is deformation energy density, and this value is multiplied by the volume of element to have the deformation (or internal) energy.

     

    I hope this is helpful

    Regards

    Hi @Rogerio Nakano,

    Thanks for this response. I'm assuming based on your use of 'eps' that the strain used in the calculation of the internal energy of an element is based only on the plastic strain (i.e. plastic strain = 0 at yield point) and does not account for elastic strain?

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