Creep and Stress Rupture Testing

Creep and Rupture tests are essential to evaluate the time-dependent behavior of metals and composites at elevated temperatures under applied stress. Deformation is measured as a function of time.

With 25 creep/stress rupture machines operational, and the capability to test designed specimens up to 10-1/8" in length, our Creep and Rupture lab provides the data essential for this evaluation.

Creep testing (creep-rupture, stress-rupture, stress-relaxation) is conducted to determine the deformation (creep) of a material when subjected to a prolonged load at a constant temperature.

  • A creep test has the objective of measuring creep and creep rates occurring at stresses usually well below those which would result in fracture.
  • In a creep-rupture test, progressive specimen deformation and the time to rupture are measured. In general, deformation during this test is much larger than that developed during a creep test.
  • A stress-rupture test is a test in which time to rupture is measured. Deformation measurements are not acquired during this test.
  • The stress-relaxation test is similar to the creep test, except the load continually decreases instead of remaining constant. The load is reduced at intervals to maintain a constant strain.

Lucideon is capable of conducting the following tests up to 1800°F in temperature and 10,000 lbs in load. Temperature and creep readings are recorded and monitored continuously to ensure accuracy of results.

ASTM Test Methods

ASTM D2990 Compressive Creep and Creep-Rupture of Plastics

ASTM E139 Creep, Creep-Rupture & Stress Rupture Tests of Metallic Materials

ASTM E292 Conducting Time-for-Rupture Notch Tension Tests of Materials

ASTM E328 Stress Relaxation for Materials and Structures.

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