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.