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Calculations for Internal/Strain Energies (Radioss)

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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Radioss

v2020.0

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Rogerio Nakano_21179

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

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?