Defining Stress-Strain Curves
Stress-strain curves are available with the following material models:
Note: For
HyperElastic Ogden
and
HyperElastic Mooney Rivlin
material models, you can define stretch ratio (deformed length/undeformed length) versus nominal stress (force/initial area) data pairs based on experimental data from specimen tests: simple tension, planar tension or pure shear, and biaxial tension.
To define a stress-strain curve:
-
In the Material dialog box, right-click Custom Materials and select New Category. If needed, rename the New Category folder.
-
Right-click the newly defined category and select New Material.
-
On the Properties tab, do the following:
-
Set Model Type to Nonlinear Elastic, Plasticity - von Mises, or Plasticity - Tresca.
-
Select the desired Units.
-
Click Create Stress-Strain Curve.
The Tables & Curves tab opens.
-
Under Type, make sure that Stress-Strain curve is selected.
-
In the Table data, do the following:
-
Select the desired stress Units.
-
Type the strain and stress data pairs in the table. For large strain formulation, type the logarithmic strain data.
-
To open a new row, double-click any cell in the Points column.
-
Click File to read data from a *.dat text file with two columns of data.
-
To view the curve, click View.
-
To save the material to a material library, click Save.
-
Click Apply.
-
Click Close.