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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. Deformation is measured as a function of time. M+P routinely performs creep testing to predict the behavior of materials utilized in rotating equipment, such as turbines and generators.

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.

M+P Labs is capable of conducting these tests up to 1800 ^oF in temperature and 10,000 lbs in load.

TEST METHODS:

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

Temperature and creep readings are recorded and monitored continuously to ensure accuracy of results. With 52 creep/stress rupture test stands operational, and the capability to test designed specimens up to 10-1/8" in length, our creep & rupture lab provides the data used to assist engineers evaluate the behavior of materials at elevated temperatures and under applied stresses.

Additional analysis and testing capabilities available at M+P Labs include:

The chemical and thermal analysis capabilities available at M+P Labs can be used in conjunction with mechanical, metallurgical, microstructural and electrical property evaluation capabilities to help solve your most challenging materials and processing problems or qualify products for use or sale.

· Chemical & compositional characterization

· Electrical testing (insulating materials)

· Failure analysis

· Mechanical testing

· Metallographic preparation

· Metallurgical evaluation

· Microscopy & image analysis

· Scanning electron microscopy/electron microprobe

· Specimen extraction & machining

· Thermal analysis

M+P Labs Quality Assurance:

The rigorous quality assurance requirements mandated by these industry quality standards: ISO 17025, Nadcap (aerospace and defense industry) and 10 CFR 50 Appendix B (nuclear utility industry) are applied to each and every job we perform, regardless of whether it requires conformance to any of these accreditations. The accuracy of the results produced by our staff of highly-experienced analysts allows our clients to make critical decisions based on precise and reliable information.

Contact Information:

For additional information or to discuss your materials testing needs, please contact us at (518) 382-0082, via email at info@mandplabs.com, or visit us on the web at www.mandplabs.com.