RF-MAT NL Add-on Module for RFEM
Consideration of Nonlinear Material Laws
The RF-MAT NL add‑on module allows for consideration of nonlinear material behavior in RFEM.
The following material models are available in RF − MAT NL:Isotropic Plastic 1D/2D/3D and Isotropic Nonlinear Elastic 1D/2D/3D
You 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)
- 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 2D
It is possible to specify the limit tension stresses σx,limit and σy,limit as well as the hardening factor CH.Orthotropic Masonry 2D
The material model Orthotropic Masonry 2D is an elastoplastic model that additionally allows material softening, which can be different in the local x- and y-direction of a surface. The material model is suitable for (unreinforced) masonry walls with loads in the plane of the pane.Isotropic Damage 2D/3D
This 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.
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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.
The material model Orthotropic Masonry 2D is an elastoplastic model that additionally allows softening of the material, which can be different in the local x- and y-direction of a surface. The material model is suitable for (unreinforced) masonry walls with in-plane loads.
- Can I simulate the cracked state of a concrete cross-section for a bending beam with the "Isotropic Nonlinear Elastic 1D" material model?
- When defining my material, I get Warning No. 1136 and cannot continue working. How can I prevent this warning?
- What is the best way to consider steel fiber reinforced concrete with the structural analysis program RFEM?
- I have edited the material in my model. When starting the calculation, I get an error message. What can be the reason for this?
- When entering a new material using the Diagram definition type, the first row is locked. How can I define the material?
- How is Young's modulus calculated for the "isotropic damage" material model?
- How is it possible to determine which plastic deformation remains in an RFEM model with a plastic material model after the relief?
- What is the difference between the materials Isotropic Plastic 1D and Isotropic Nonlinear Elastic 1D?
- It is not possible to enter a nonlinear stress-strain curve. The diagram is initially displayed correctly, but then an error message appears saying that the positive values have to be only entered in ascending order. How can I avoid this message?
- Is it possible to perform a seismic analysis with the masonry material model?
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