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AnswerThe add-on module RF-MAT NL is already integrated in RFEM 5. It is assumed that the following material models can be used:Isotropic Plastic 1DIsotropic Plastic 2D/3DIsotropic Nonlinear Elastic 1DIsotropic Nonlinear Elastic 2D/3DOrthotropic plastic 2DOrthotropic 3D plasticIsotropic Masonry 2DIsotropic damage 2D / 3D
AnswerWhen calculating nonlinear material models, especially for plastic material models, the calculation is always performed in relation to the original constant internal forces.Therefore, you should set the smoothing of the FE elements to "Constant."Furthermore, the stresses are related to the principal stresses $ \ sigma_1 $ or $ \ sigma_2 $.Even if all these factors have been taken into account, there may still be deviations from the defined limit stress. These usually result from the defined hardening modulus.This fact is explained in detail for the technical articles listed below.
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