GuiCommand:Container| {{GuiCommand Name: FEM MaterialMechanicalNonlinear MenuLocation: Model , Materials , Nonlinear mechanical material Workbenches: FEM_Workbench SeeAlso: FEM_tutorial }} {{GuiCommandFemInfo Solvers: CalculiX }}
FEM MaterialMechanicalNonlinear
Description
Creates a nonlinear mechanical material. Currently, only plasticity with simple (isotropic) hardening is available. (v1.0) : Kinematic hardening is also available.
Usage
- To create a new MaterialMechanicalNonlinear object do the following:
- Add a
Material for solid first and select it. - Click the
Nonlinear mechanical material button or choose the Model → Materials → Nonlinear mechanical material option from the menu.
- Add a
- To edit an existing MaterialMechanicalNonlinear object:
- Select it in the Tree view.
- Select the material model (isotropic (simple) hardening or (v1.0) : kinematic hardening).
- Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the ... button next to Yield Points to input the points using a user-friendly list. The syntax is described in the Notes section.
Notes
- In FreeCAD 0.19 and older versions, only 3 yield points can be specified. Since version 0.20 a list of yield points can contain as many as required.
- The syntax should be:
:
stress_1, 0
stress_2, plastic_strain_2
...
: With dot as the decimal separator since that\'s what CalculiX uses.
: For example to define a bilinear model with hardening for S275 steel:
:
275, 0
490, 0.2
: Or, to define perfect plasticity with no hardening for this material:
:
275, 0
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This page is retrieved from https://github.com/FreeCAD/FreeCAD-documentation/blob/main/wiki/FEM_MaterialMechanicalNonlinear.md