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Impression creep; a new creep test

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Abstract

A 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 steady-state velocity is found to have the same stress and temperature dependences as the conventional undirectional creep tests using bulk specimens. Three possible mechanisms are analysed in detail, bulk diffusion, surface diffusion, and dislocation creep. They have different stress and indenter-size (radius) dependences. Experimental results on succinonitrile crystals are reported.

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Authors and Affiliations

  1. Materials Science Program, Department of Mechanical and Aerospace Sciences, University of Rochester, Rochester, New York, USA

    S. N. G. Chu & J. C. M. Li

Authors
  1. S. N. G. Chu
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  2. J. C. M. Li
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Chu, S.N.G., Li, J.C.M. Impression creep; a new creep test. J Mater Sci 12, 2200–2208 (1977). https://doi.org/10.1007/BF00552241

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  • DOI: https://doi.org/10.1007/BF00552241

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