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. At Laboratory Testing Inc. The highest quality specimens are prepared right in our on-premises machine shop for fast turnaround of test results.
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. Ask us to provide a fast quote for your test specifications. 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. The differences are described as follows:. Constant load testing is performed on a machine with a straight lever arm. As the specimen elongates, the capstan on the frame automatically adjusts to maintain the lever arm in the horizontal position, keeping the load application at a fixed length along the lever. Constant stress machines have a curved lever or cam.
Unlike the constant load machines, the frames do not have any automatic levelling to the cam. Instead, as the cam lowers, the distance of the applied load from the pivot is reduced and therefore the force acting on the specimen decreases. The design of the cam i. 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. Contact us Get in touch. Lucideon logo Created with Sketch.
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