Define a stress versus strain curve that is referenced by a nonlinear material
property.
SimSolid assumes an engineering stress-strain curve.
- Engineering stress
- Assumes a constant non-changing cross-section area during deformation.
- True Stress
- Assumes the cross-section area that changes at every instant during
deformation.
Some sources use true stress-strain curves. They can be imported by SimSolid from a CSV file.
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In the Project Tree, click on the Assembly branch to
open the Assembly workbench.
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On the workbench toolbar, click the (Apply materials) icon.
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In the dialog, choose a material to activate the Stress-strain curve
button.
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Click the Stress-strain curve button.
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In the Stress-strain curve dialog, use one of the
following methods to define a stress-strain curve:
Method |
Process |
Import from CSV |
- Click the Import CSV button.
- In the File browser, choose the desired CSV and click
Open.
|
Create from N-values |
Create stress-strain curve using a K-n power law function.
- Click the Create by n-value button.
- Specify K and n.
Some sample K-n values for typical materials are given in the
drop-down menu. |
Create manually |
- Select the Add row button.
- Enter the stress and strain values. At minimum, 3 points are
required.
|
The results will be plotted in the XY
graph in the dialog. You can use the scroll wheel to zoom in, the left mouse
button to pan, or the Refit button to reset the
graph.
- Optional:
Click the Edit elasticity modulus button to update the
elasticity modulus of a selected material.
The stress-strain curve is automatically updated to reflect the
elasticity modulus entered.
If the elasticity modulus defined is less than
the elasticity modulus derived from the curve, the stress-strain curve is
trimmed by intersecting the line that defines the new elasticity modulus and
the stress-strain curve.
Note: If an x-value input is outside the range of
x-values specified on the Table, the corresponding y-value look up is
performed using linear extrapolation from the two end
points.