Stress Rupture & Creep Testing

Accredited Testing of Metals

Stress rupture testingStress Rupture Testing and Creep Testing services are performed conveniently and reliably at Laboratory Testing Inc. on metallic materials. Both tests are valuable in evaluating the effects of long-term stress on materials in order to prevent failures.

A stress rupture test applies a constant load to a metal test specimen at a specified temperature until failure. The creep test, also called a creep rupture test, shows deformation in a metallic material at temperatures that are generally elevated and under a constant load over time.

Fully Qualified for Fast, Reliable Results

At Laboratory Testing Inc., stress rupture testing and creep testing are Nadcap accredited, A2LA accredited to ISO/IEC 17025 and in compliance with ASTM standards. The highest quality specimens are prepared right in our on-premises machine shop for fast turnaround of test results.

The Lab, near Philadelphia, PA in the United States, is equipped with fully-automated machines that perform the tests at temperatures up to 2000°F. The equipment provides reliable temperature control using calibrated thermocouples attached to the test specimens. The load is adjusted automatically at various time intervals for efficiency.

GE Aviation has approved LTI for stress rupture testing. Pratt & Whitney (P&W) has qualified LTI as a commercial laboratory for performing Reference MCL Manual Section Appendix 56: Code 3 stress rupture testing. The stress rupture and creep test systems used at LTI also meet with ISO 9000 and ASTM compliance.

stress_ruptureTest Methods/Specifications

  • ASTM E139
  • ASTM E292
  • NASM-1312-10

Ask us to provide a fast quote for your test specifications.

The Test Processes

Creep and stress rupture testing services are generally performed at elevated temperatures which may be as high as nearly a few thousand degrees Fahrenheit. Stress rupture and creep test machines are designed to apply a static stress to a test specimen at a specific temperature. During the test, data is plotted showing stress versus time.

What is a Stress Rupture Test?

The stress rupture test is used to determine the time necessary to produce failure while material is subjected to constant load at a constant temperature. The test measures time to rupture and the effect of temperature on long-time load-bearing characteristics. The reported results are very useful in the selection of materials where dimensional tolerances are not critical, but rupture cannot be allowed. Stress rupture testing is similar to creep testing, except the stresses are higher.

What is a Creep Test?

The creep test is time dependent and measures dimensional changes that occur to a specimen due to high temperature when a constant stress or load, below its yield strength, is applied. The elongation or deformation of the specimen is measured by an extensometer, thereby calculating how a component or part will change in shape during service. Creep testing is valuable for determining the speed at which a component or part will deform at a given load and temperature. This is of particular importance when dimensional control is crucial, so components can be safely designed for high temperature service. This information can then be used to extrapolate time-to-failure for longer time periods.

Test Specimens Machined at LTI

Precision specimens in all configurations are prepared by the fully-capable in-house Machine Shop at LTI. A test specimen is machined from a sample of the metal material in question, according to specific guidelines usually published in a specification. The variety of test specimens required for stress rupture testing and creep testing include smooth, notched, combination smooth & notched, and flat.

LTI Capabilities

  • Temperatures – up to 2000°F
  • Standards – comply with ASTM standards E139, E292, and NASM-1312-10
  • Materials Tested – metals
  • Test Specimens – LTI’s Machine Shop can provide smooth, notched, combination smooth & notched and flat stress rupture test and creep test specimens
  • Approvals:
    • GE Aviation
    • P&W qualified as a commercial laboratory for Reference MCL Manual Section Appendix 56: Code 3 stress rupture testing

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