期刊
PHILOSOPHICAL MAGAZINE
卷 101, 期 4, 页码 420-434出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/14786435.2020.1841916
关键词
Hardness; indentation size effect; dislocations; plasticity of metals
类别
资金
- ERDF [CZ.02.1.01/0.0/0.0/17_048/0007373]
- Technology Agency of the Czech Republic [TH02020565]
A new approach is proposed in this paper to account for the indentation size effect in metals with the dislocation mediated deformation mechanism. The model is verified on a set of materials and discusses the effect of materials parameters and the indenter geometry on the validity of the model.
A new approach accounting for the indentation size effect in metals with the dislocation mediated deformation mechanism is proposed in the paper. The model is based on the assumption that the number of dislocations contained in the 'effective' plastic zone under the contact area incrementally scales with the penetration depth with (h)m, which leads to the modification of the Nix-Gao model, so that the hardness dependence on penetration depth can be expressed as: H=H-0 root 1+h(0)/h(1-e-h(n)/h(1)]. The approach is verified on a set of materials including single crystals, pure polycrystalline metals as well as alloys. The effect of materials parameters and the indenter geometry on the validity of the model is discussed.
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