RF-MAT NL Add-on Module for RFEM
Consideration of Nonlinear Material Laws
Further Information
The RF-MAT NL add‑on module allows for consideration of nonlinear material behavior in RFEM.
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Features
The following material models are available in RF − MAT NL:
Isotropic Plastic 1D/2D/3D and Isotropic Nonlinear Elastic 1D/2D/3DYou can select three different definition types here:
- Basic (definition of the equivalent stress under which the material plastifies)
- Bilinear (definition of the equivalent stress and strain hardening modulus)
- Diagram:
- Definition of polygonal stress-strain diagram
- Option to save / import the diagram
- Interface with MS Excel
This material model allows the definition of material properties (modulus of elasticity, shear modulus, Poisson's ratio) and ultimate strengths (tension, compression, shear) in two or three axes.
Isotropic Masonry 2DIt is possible to specify the limit tension stresses σx,limit and σy,limit as well as the hardening factor CH.
Orthotropic Masonry 2DThe material model Orthotropic Masonry 2D is an elastoplastic model that additionally allows material softening, which can be different in the local x- and y-directions of a surface. The material model is suitable for (unreinforced) masonry walls with loads in the plane of the pane.
Isotropic Damage 2D/3DThis material model enables definition of asymmetric stress‑strain diagrams. The elastic modulus is calculated by Ei = (σi-σi-1) / (εi-εi-1) in each step of the stress-strain diagram.
For plastic stresses of ductile materials such as steel, yielding effects occur where the increase in deformation comes along with hardening. They lead to permanent deformations - and in extreme cases, to the destruction of the structural component.
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