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    Gale, J. D. and Achuthan, A. 2014. The effect of work-hardening and pile-up on nanoindentation measurements. Journal of Materials Science, Vol. 49, Issue. 14, p. 5066.

    Gale, Josh and Achuthan, Ajit 2014. 55th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference.


Effects of mechanical properties on the contact profile in Berkovich nanoindentation of elastoplastic materials

  • Jiangting Wang (a1), Peter D. Hodgson (a1) and Chunhui Yang (a2)
  • DOI:
  • Published online: 17 November 2011

Pile-up or sink-in is always a concern in a nanoindentation test because it gives rise to errors in the estimation of the projected contact area when it is theoretically analyzed with the classic Oliver–Pharr method. In this study, a three-dimensional finite element model is developed to simulate nanoindentation with a perfect Berkovich tip. The variation of the contact profile with respect to the work-hardening rate n and the ratio of yield stress to elastic modulus σy/E has been studied for a wide range of elastoplastic materials. The numerical results show that a low σy/E not only facilitates the pile-up for materials with little or no work-hardening but also enhances the sink-in for materials with a high work-hardening rate. It is attributed to the lateral-flow dominated plastic deformation in low work-hardening materials and the normal-flow dominated plastic deformation in high work-hardening materials, respectively. Because of the large sink-in, for the materials with high n and low σy/E, significant errors in the calculation of the projected contact area can be generated by using the classic Oliver–Pharr method.

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