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002703
2019-03-27

Calculation of Nonlinear Material Models in RFEM

Why do the limit stresses not match the calculated stresses when using a nonlinear material?


Answer:

When calculating nonlinear material models (especially for plastic material models), the calculation is always related to the original constant internal forces. Therefore, the smoothing of the FE elements should be set to "Constant" (see Image 01).

Furthermore, the stresses are related to the principal stresses σ1 or σ2

Even if these conditions are taken into account, deviations from the defined limit stress may occur. They usually result from the defined hardening modulus. This fact is explained in detail in this technical article, which can be found under the links.


Author

Mr. Kuhn is responsible for developing products for timber structures, and provides technical support for our customers.

Links


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