A numerical study on pile-up in nanoindentation creep Online publication date: Thu, 26-Jun-2008
by S. Mandal, S. Kose, A. Frank, A.A. Elmustafa
International Journal of Surface Science and Engineering (IJSURFSE), Vol. 2, No. 1/2, 2008
Abstract: In this paper, we simulate materials of variable hardness, work hardening exponent, χ = ∂1nσ/∂1nε of 0.1–0.3 and a strain rate sensitivity of von Mises stress, vσ = ∂1nσ/∂1nε of 0.08–0.16 to estimate pile-ups and sink-ins during indentation creep and compare the results with literature data. We report that materials pile-up for vΗ/vσ ≥ 1.0 and sink-in for vΗ/vσ < 1.0, vσ is the strain rate sensitivity of the hardness. vΗ/vσ approaches 1 for small Η/Ε*, i.e., soft materials and deformation is dominated by pile-up, whereas when vΗ/vσ approaches 0 for large Η/Ε* corresponds to purely elastic deformation which is apparently dominated by sink-in in a manner prescribed by Hertzian contact mechanics.
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