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History "Constant on elements"

Figure 01 - History "Constant on elements"

 Material Model "Isotropic Plastic"

Figure 02 - Material Model "Isotropic Plastic"
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FAQ 002703 EN

27 March 2019

Bastian Kuhn General RFEM Concrete Structures Steel Structures Finite Element Analysis Nonlinear Analysis

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

Answer

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

Furthermore, the stresses are related to the principal stresses $ \ sigma_1 $ or $ \ sigma_2 $.

Even taking these conditions into account, deviations from the defined limit stress may occur. They usually result from the defined solidification modulus. This fact is explained in detail in the technical article, which you can access under Links below.

Keywords

Material Model Nonlinear Plastic Solidification Modulus Nonlinear material

Links

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