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Analysis of indentation creep

  • Outstanding Symposium Paper
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Abstract

Finite element analysis is used to simulate cone indentation creep in materials across a wide range of hardness, strain rate sensitivity, and work-hardening exponent. Modeling reveals that the commonly held assumption of the hardness strain rate sensitivity (mH) equaling the flow stress strain rate sensitivity (ms) is violated except in low hardness/modulus materials. Another commonly held assumption is that for self-similar indenters the indent area increases in proportion to the (depth)2 during creep. This assumption is also violated. Both violations are readily explained by noting that the proportionality “constants” relating (i) hardness to flow stress and (ii) area to (depth)2 are, in reality, functions of hardness/modulus ratio, which changes during creep. Experiments on silicon, fused silica, bulk metallic glass, and poly methyl methacrylate verify the breakdown of the area-(depth)2 relation, consistent with the theory. A method is provided for estimating area from depth during creep.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, and Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA

    Don S. Stone

  2. Materials Science Program, University of Wisconsin-Madison, Madison, Wisconsin, 53706, USA

    Jakes E. Joseph & Jonathan Puthoff

  3. Performance Enhanced Biopolymers, United States Forest Service, Forest Products Laboratory, Madison, Wisconsin, 53726, USA

    Jakes E. Joseph

  4. Department of Mechanical Engineering and The Applied Research Center–Jefferson Laboratory, Old Dominion University, Norfolk, Virginia, 23529, USA

    Abdelmageed A. Elmustafa

Authors
  1. Don S. Stone
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  2. Jakes E. Joseph
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  3. Jonathan Puthoff
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  4. Abdelmageed A. Elmustafa
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Correspondence to Don S. Stone.

Additional information

Articles in this section are based on presentations that were selected by MRS Meeting Symposium Organizers as outstanding papers. Upon selection, authors are invited to submit their research results to Journal of Materials Research. These papers are subject to the same peer review and editorial standards as all other JMR papers. This is another way by which the Materials Research Society recognizes high quality papers presented at its meetings.

This paper was selected as an Outstanding Symposium Paper for the 2007 MRS Fall Meeting, Symposium AA Proceedings, Vol. 1049.

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Stone, D.S., Joseph, J.E., Puthoff, J. et al. Analysis of indentation creep. Journal of Materials Research 25, 611–621 (2010). https://doi.org/10.1557/JMR.2010.0092

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  • DOI: https://doi.org/10.1557/JMR.2010.0092

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