FEM MaterialMechanicalNonlinear: Difference between revisions

From FreeCAD Documentation
mNo edit summary
mNo edit summary
Line 40: Line 40:
<!--T:13-->
<!--T:13-->
* 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.
* 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 beː
* The syntax should be:

</translate>
{{Code|code=
{{Code|code=
stress_1, 0
stress_1, 0
Line 46: Line 48:
...
...
}}
}}
<translate>


with dot as the decimal separator since that's what CalculiX uses.
With dot as the decimal separator since that's what CalculiX uses.


For example to define a bilinear model with hardening for S275 steel:
For exampleː

</translate>
{{Code|code=
{{Code|code=
275, 0
275, 0
490, 0.2
490, 0.2
}}
}}
<translate>
to define a bilinear model with hardening for S275 steel orː

Or, to define perfect plasticity with no hardening for this material:

</translate>
{{Code|code=
{{Code|code=
275, 0
275, 0
}}
}}
<translate>
to define perfect plasticity with no hardening for this material.



<!--T:5-->
<!--T:5-->

Revision as of 13:12, 24 November 2023

FEM MaterialMechanicalNonlinear

Menu location
Model → Materials → Nonlinear mechanical material
Workbenches
FEM
Default shortcut
None
Introduced in version
-
See also
FEM tutorial

Description

Creates a nonlinear mechanical material. Currently, only plasticity with simple (isotropic) hardening is available.

Usage

  1. To create a new MaterialMechanicalNonlinear object do the following:
  2. To edit an existing MaterialMechanicalNonlinear object:
    • Select it in the Tree view.
    • Select the material model (currently, only simple hardening is available).
    • Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the ... button next to DataYield 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