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Instrumented pyramidal and spherical indentation of polycrystalline graphite

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Abstract

The elastoplastic surface deformation of a polycrystalline graphite was studied by examining the indenter’s geometry dependence of load P versus penetration depth h relation (P–h relation) in instrumented pyramidal/spherical indentation tests. The tetrahedral pyramid indenters included inclined face angles β of 10.0°, 22.0° (Vickers pyramid), and 40.0°. The tip radius of spherical indenters used were 32 μm, 200 μm, 794 μm, 1.59 mm, and 6.35 mm. The true hardness H as a measure for plasticity was singled out of the elastoplastic loading parameter k1 in the quadratic expression of P = k1h2 and then quantitatively related to the yield stress Y that was determined from the mean contact pressure for spherical indentation at the onset of plastic yielding. The size effect of Y, decreasing with the increase in the tip radius of spherical indenter, is discussed using the model of geometrically necessary dislocations in terms of the material length scales for a plastic field with strain gradient.

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Author notes

  1. Y. Nakano

    Present address: Technical Research Laboratory, Mino Yogyo Co. Ltd, Kamezaki Kitaura-cho, Handa, 475-0027, Japan

Authors and Affiliations

  1. Department of Materials Science, Toyohashi University of Technology, Tempaku-cho, Toyohashi, 441-8580, Japan

    M. Sakai & Y. Nakano

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  1. M. Sakai
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  2. Y. Nakano
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Correspondence to M. Sakai.

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Address all correspondence to this author. This author was an editor of this journal during the review and decision stage. For the JMR policy on review and publication of manuscripts authored by editors, please refer to http://www.mrs.org/publications/jmr/policy.html

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Sakai, M., Nakano, Y. Instrumented pyramidal and spherical indentation of polycrystalline graphite. Journal of Materials Research 19, 22 (2004). https://doi.org/10.1557/jmr.2004.19.1.228

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  • DOI: https://doi.org/10.1557/jmr.2004.19.1.228

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