Abaqus: Hyperelastic model with stress softening

This test program is recommended for modeling rubbers and other polymers that exhibit stress softening, also known as Mullins effect.

Abaqus Keywords

Test Program
We recommend the following base tests:

Test ID
Description # Repeats # Specimens
UT003 Tensile test 2 2

Depending on the complexity of loading or deformation, we may recommend the following additional tests:

Test ID Description # Repeats # Specimens
PT003 Planar tension test 2 2
UC003 Compression test 2 2
VC003 Volumetric compression test 2 2


  • These tests are performed at room temperature.  For other temperatures see ABQ006.
  • Stabilized/pre-conditioned stress softening response will be provided for up to 3 or 4 strain levels, except for VC003.
  • Virgin elastic response will also be provided for all the tests.
  • UC003 may provide non-homogeneous stress/strain data.  Inverse calibration procedures may be necessary.
  • Veryst will provide a calibrated material model for the observed response and the material.
  • The resulting set of parameters can be used directly in Abaqus CAE or the input file.

Specimen Requirements

  • 3 tensile (dog-bone) specimens
  • 3 planar tension specimens
  • 3 compression cylinder specimens
  • 3 volumetric compression specimens

See the description of individual tests for details on specimen geometries.  Note that we request extra specimens to ensure a sufficient supply of specimens for valid testing.

Veryst can also assist in molding standard and non-standard test specimens.  Please contact us if you are interested in discussing this option.

Additional Validation
Veryst can perform additional validation, depending on the target material and the simulation application, through any of the following tests and component level FE simulation:

  • Impact testing
  • Micro-to-macro indentation responses

More information
For a customized quotation, please write to us at testing@veryst.com and indicate the Test ID (ABQ003), type of material, test temperatures, specimen geometries available, or other relevant details.

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