Test program for elastic-plastic modeling of thermoplastic materials (no temperature or rate dependence)

This test program is recommended for generating experimental data useful for modeling the elastic-plastic behavior of a thermoplastic material with no rate or temperature dependence.

Test Program
We recommend the following base tests:

Test ID Description # repeats # Specimens
UT001 Tensile test 2 2
UC001 Compression test 2 2

Depending on the material, we may also recommend the following additional tests:

Test ID Description # repeats # Specimens
VC001 Volumetric compression test 2 2


  • These tests are performed at a fixed temperature [Room Temperature (RT), High Temperature (HT) or Cryogenic Temperature (CT)].
  • UC001 may provide non-homogeneous stress / strain data.  Inverse calibration procedure may be necessary.
  • VC001 is not needed for an incompressible material.
  • The test program assumes the material is isotropic.  If the material is anisotropic, Veryst recommends a different suite of tests.  Write to us at for more info.

Specimen Requirements

  • 3 tensile (dog-bone) 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.

Material Model Calibration 
Veryst can use the above test program to calibrate an appropriate elastic-plastic constitutive model for use in finite element simulations.  Veryst can calibrate models built-in to commercial finite element (FE) codes (Abaqus, ANSYS, COMSOL Multiphysics, LS-DYNA, etc.) or advanced models from the PolyUMod® library, which may also be used with most commercial FE codes.

Typical candidate material models include advanced polymer viscoplasticity models [Bergstrom-Boyce, three-network model (TNM), parallel network model (PNM), parallel rheological flow (PRF), etc.]  The specific model selected depends on the material behavior and your FE software. 

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

More Information
For a customized quotation, please write to us at and indicate the Test ID (TP001), type of material, test temperatures, specimen geometries available, or other relevant details.

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