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UC005 – Compression stress relaxation testing:

(Up to 12 hours)


A uniaxial compression specimen is loaded to a specified strain. The imposed strain is maintained for up to 12 hours and the stress/strain response of the material is measured. The specimen is unloaded to zero stress at the end of the specified time duration. Strain is determined by measuring the local platen displacement using an extensometer (clip-on or non-contact, laser).

Temperature Options

This test can generally be performed at any temperature between -80ºC and 280ºC.

  • CT: Cryogenic temperatures (-80ºC to 20ºC)

  • RT: Room temperature (~ 20ºC)

  • HT: High temperatures (20ºC to 280ºC)

Note: The use of the temperature chamber for high and low temperature tests limits the crosshead displacement for these tests.  Some combinations of material, temperature and specimen geometries may not be possible to complete to failure.

Strain Rates

Strain rates up to ~ 1/s are possible, depending on specimen geometry.

Applicable Standards

ASTM D575, ASTM D695, ISO 604

Data Provided

Time, Engineering Strain, Engineering Stress, Load, Crosshead Displacement, Extensometer Measurement

Values Reported

Elastic Modulus, Yield Strength (0.2% offset)

Specimen Requirements

Cylinders, prisms or tubes with dimensions as specified in ASTM D575, D695 and ISO 604 are preferred.  Comparable geometries are also possible.

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.

Replicates Recommended


More Information

For a customized quotation, please click the button below and indicate the Test ID (e.g., UC001, UC002), type of material, test temperatures and any other details (specimen geometries available, other unique constraints, etc.)

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