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.
Most Common Performance Classes L1 and L2 with Corresponding Basic Values of the Axial Post-Cracking Tensile Strength
Stress-Strain Curve in the Tension Area According to  to Determine Internal Forces and Deformations in Nonlinear Methods
Stress-Strain Curve on the Tension Side According to  for Cross-Section Design in the Ultimate Limit State
Stress-Strain Diagram According to  for the Compression Zone: a) for the Nonlinear Calculation; b) for the Cross-Section Design
- How does the "Orthotropic Plastic" material model work in RFEM?
- What is the best way to consider steel fiber concrete in the structural analysis software RFEM?
- 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?
- 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?
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