ANS007

ANSYS: Linear visco-hyperelastic

Description
This test program is recommended for modeling the viscoelastic response of rubbers and other polymers that exhibit the same relaxation behavior over a wide range of deformation.

ANSYS Commands
TB, HYPER
TB, PRONY

Test Program
We recommend the following base tests:

Test ID Description # Strain Levels # Repeats # Specimens

UT001

Tensile test

1

2

2

UT005

Stress relaxation test

2

2

4

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

Test ID Description # Strain Levels # Repeats # Specimens

PT001

Planar tension test

1

2

2

UC001

Compression test

1

2

2

VC001

Volumetric compression test

1

2

2

VC005

Volumetric stress relaxation test

2

2

4

Notes

  • These tests are performed at room temperature.  For other temperatures see ANS009.

  • Stress relaxation from 2 or more strain levels is recommended to determine if a linear viscoelastic model is appropriate for this material.

  • UC001 may provide non-homogeneous stress/strain data.  Inverse calibration procedures may be necessary.

  • VC001 and VC005 are not needed for an incompressible material.

  • Veryst will provide a calibrated material model for the observed response and the material.

  • The resulting set of parameters can be used directly in ANSYS APDL, ANSYS Workbench, or the input file.


Specimen Requirements

  • 10 tensile (dog-bone) specimens
  • 3 planar tension specimens
  • 3 compression cylinder specimens
  • 10 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 any necessary component level FE simulation:

  • Impact testing

  • Micro-to-macro indentation responses

  • Compression relaxation tests

  • Cyclic tests with loading/unloading between different strain levels and zero stress level at different rates


More information
For a customized quotation, please write to us at testing@veryst.com and indicate the Test ID (ANS007), type of material, test temperatures, specimen geometries available, or other relevant details.

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