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FAQ 002703 EN-US 03/27/2019

Bastian Kuhn General RFEM

# Why does the limit stress when using a nonlinear material not match the calculated stress?

#### Answer

When calculating non-linear material models, especially in the case of plastic material models, the calculation is always based on the original constant internal forces.
Therefore, the smoothing of the FE elements should be set to "constant".
Furthermore, the voltages are related to the principal stresses $\ sigma_1$ and $\ sigma_2$.
Even if all these factors have been taken into account, there may still be deviations from the defined limit voltage. These usually result from the defined solidification module.

This fact will be explained in detail in the following articles.

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