stress-relaxation test

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stress-relaxation test

mechanics

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description

In deformation and flow
…procedure is known as a stress-relaxation test. The physical reasons for this behaviour are too complex to be explained by any simple molecular model. Such behaviour is characteristic of glass, rubber, many plastics, and some metals.
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viscoelasticity

In materials testing: Creep test
…response is measured by the stress-relaxation test. A prescribed displacement or strain is induced in the specimen and the load drop-off as a function of time is measured. Various viscoelastic theories are available that permit the translation of stress-relaxation test data into predictions about the creep behaviour of the material.
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testing machine

materials testing

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Article History

Related Topics:: materials testing; strength of materials; constant load-rate test machine; constant displacement-rate testing machine

See all related content

testing machine, Machine used in materials science to determine the properties of a material. Machines have been devised to measure tensile strength, strength in compression, shear, and bending (see strength of materials), ductility, hardness, impact strength (see impact test), fracture toughness, creep, and fatigue. Standardization of machines and tests is the province of the International Organization for Standardization, American National Standards Institute, British Standards Institution, and many governmental bodies. Many industries have special-purpose testing machines for the materials they use.

This article was most recently revised and updated by Robert Curley.