FEM MaterialMechanicalNonlinear/ro: Difference between revisions

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==Description==
==Description==


Adds nonlinear mechanical material model. Currently only plasticity with simple hardening is available.
Creates a nonlinear mechanical material. Currently, only plasticity with simple (isotropic) hardening is available. {{Version|1.0}}: Kinematic hardening is also available.


==Usage==
==Usage==


# To define nonlinear mechanical material model do the following:
# To create a new MaterialMechanicalNonlinear object do the following:
#* Add the {{Button|[[Image:Fem-add-material.svg|16px]] [[FEM_MaterialSolid|MaterialSolid]]}} first and select it.
#* Add a {{Button|[[Image:FEM_MaterialSolid.svg|16px]] [[FEM_MaterialSolid|Material for solid]]}} first and select it.
#* Click the {{Button|[[Image:FEM MaterialMechanicalNonlinear.svg|16px]] [[FEM MaterialMechanicalNonlinear|FEM MaterialMechanicalNonlinear]]}} button or choose the {{MenuCommand|Model → Materials → [[Image:FEM_MaterialMechanicalNonlinear.svg|16px]] Nonlinear mechanical material‏‎}} option from the menu.
#* Click the {{Button|[[Image:FEM MaterialMechanicalNonlinear.svg|16px]] [[FEM MaterialMechanicalNonlinear|Nonlinear mechanical material]]}} button or choose the {{MenuCommand|Model → Materials → [[Image:FEM_MaterialMechanicalNonlinear.svg|16px]] Nonlinear mechanical material‏‎}} option from the menu.
# To edit an existing MaterialMechanicalNonlinear object:
# To edit an existing MaterialMechanicalNonlinear object:
#* Click it in the [[Tree_view|Tree view]].
#* Select it in the [[Tree_view|Tree view]].
#* Select the material model (currently only simple hardening is available).
#* Select the material model (isotropic (simple) hardening or {{Version|1.0}}: kinematic hardening).
#* Define yield points (stress vs plastic strain). The first point must have a zero plastic strain specified.
#* Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the {{Button|...}} button next to {{PropertyData|Yield Points}} to input the points using a user-friendly list. The syntax is described in the [[#Notes|Notes]] section.


==Notes==
==Notes==


* In FreeCAD 0.19 and older versions, it's possible to specify only 3 yield points. Since the 0.20 version, this limitation doesn't exist and a list of yield point can contain as many of them as needed.
* 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:

: {{Code|code=
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:

: {{Code|code=
275, 0
490, 0.2
}}

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

: {{Code|code=
275, 0
}}





Latest revision as of 10:04, 21 April 2024

FEM MaterialMechanicalNonlinear

Menu location
Model → 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. introduced in version 1.0: Kinematic hardening is also 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 (isotropic (simple) hardening or introduced in version 1.0: kinematic hardening).
    • Define yield points (stress [MPa] vs plastic strain). The first point must have a zero plastic strain. Press the ... button next to DateYield 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