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

1. 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.
2. 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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