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Impression creep; a new creep test
Journal of Materials Science, 1977A new indentation creep test is introduced in which the indenter is a circular cylinder with a flat end. Unlike conventional indentation tests, a steady-state velocity is observed in this new test shortly after a transient period during which the indenter makes a shallow impression on the surface of the specimen; hence the name “impression creep”. This
S. N. G. Chu, J. C. M. Li
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Journal of Testing and Evaluation, 1991
Abstract Cryogenic creep testing methods are examined and evaluated. Because of the difficulty in testing at cryogenic temperatures and the relatively low creep rates that are observed at temperatures below 77 K, cryogenic creep systems must have very sensitive strain measurement capabilities and be extremely stable.
LC McDonald, KT Hartwig
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Abstract Cryogenic creep testing methods are examined and evaluated. Because of the difficulty in testing at cryogenic temperatures and the relatively low creep rates that are observed at temperatures below 77 K, cryogenic creep systems must have very sensitive strain measurement capabilities and be extremely stable.
LC McDonald, KT Hartwig
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Journal of Mechanical Engineering Science, 1971
A new test for investigating biaxial creep in sheet metal is described. The specimen is a thin circular diaphragm clamped at the edge and deflected by lateral hydrostatic pressure. Stress and strain in the central region of the specimen are determined from measurements of pressure and of extension and curvature at the pole.
I. H. Wilson, J. L. Duncan, W. Johnson
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A new test for investigating biaxial creep in sheet metal is described. The specimen is a thin circular diaphragm clamped at the edge and deflected by lateral hydrostatic pressure. Stress and strain in the central region of the specimen are determined from measurements of pressure and of extension and curvature at the pole.
I. H. Wilson, J. L. Duncan, W. Johnson
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JOM, 1986
The automotive Stirling engine, presently being developed by the U.S. Department of Energy and NASA, uses high-pressure hydrogen as a working fluid; its long-term effects on the properties of alloys are relatively unknown. Hence, creep-rupture testing of wrought and cast high-temperature alloys in high-pressure hydrogen is an essential part of the ...
Subrata Bhattacharyya +2 more
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The automotive Stirling engine, presently being developed by the U.S. Department of Energy and NASA, uses high-pressure hydrogen as a working fluid; its long-term effects on the properties of alloys are relatively unknown. Hence, creep-rupture testing of wrought and cast high-temperature alloys in high-pressure hydrogen is an essential part of the ...
Subrata Bhattacharyya +2 more
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Creep Behavior of Shale: Nanoindentation vs. Triaxial Creep Tests
Rock Mechanics and Rock Engineering, 2020In this study, three shale samples from the Wolfcamp Formation in Permian basin were selected and studied for creep behavior using two different methods at macro- and micro-scale: triaxial and nanoindentation creep tests. The triaxial creep test showed the effects of axial differential stress on the creep behavior of shale rocks including the strain ...
Kouqi Liu +3 more
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1992
Creep is the continued slow straining of a material under constant load. Another phenomenon, related to creep, is relaxation. This is the reduction in the level of stress within a material with time when the strain is constant. Both creep and relaxation are of consequence with many thermoplastics at ordinary temperatures but do not become significant ...
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Creep is the continued slow straining of a material under constant load. Another phenomenon, related to creep, is relaxation. This is the reduction in the level of stress within a material with time when the strain is constant. Both creep and relaxation are of consequence with many thermoplastics at ordinary temperatures but do not become significant ...
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