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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:

  1. In the Material dialog box, right-click Custom Materials and select New Category. If needed, rename the New Category folder.

  2. Right-click the newly defined category and select New Material.

  3. On the Properties tab, do the following:

    1. Set Model Type to Nonlinear Elastic, Plasticity - von Mises, or Plasticity - Tresca.

    2. Select the desired Units.

    3. Click Create Stress-Strain Curve.

The Tables & Curves tab opens.

    1. Under Type, make sure that Stress-Strain curve is selected.

    2. 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.

  1. To save the material to a material library, click Save.

  2. Click Apply.

  3. Click Close.

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