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Time Dependent Deformation During Indentation Testing

  • B. N. Lucas (a1), W. C. Oliver (a1), G. M. Pharr (a2) and J-L. Loubet (a3)

Abstract

Constant loading rate/load indentation tests (1/P dP/dt) and constant rate of loading followed by constant load (CRL/Hold) indentation creep tests have been conducted on high purity electropolished indium. It is shown that for a material with a constant hardness as a function of depth, a constant (1/P dP/dt) load-time history results in a constant indentation strain rate (1/h dh/dt). The results of the two types of tests are discussed and compared to data in the literature for constant stress tensile tests. The results from the constant (1/P dP/dt) experiments appear to give the best correlation to steady-state uniaxial data.

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1. Mayo, M.J. and Nix, W.D., Acta. Met. 36, 21832192 (1988).
2. Weertman, J., Trans. of AIME 218, 207218 (1960).
3. Tabor, D.S.. Hardness of Metals (Clarendon Press, Oxford, 1951).
4. Bower, A.F., Fleck, N.A., Needleman, A., and Ogbonna, N., Proc. R. Soc. Lond.Å 441, 97124 (1993).

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