Proceedings of the Korean Society of Precision Engineering Conference (한국정밀공학회:학술대회논문집)
- 2004.10a
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- Pages.413-417
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- 2004
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- 2005-8446(pISSN)
Analysis of the nano indentation using MSG plasticity
Mechanism-based Strain Gradient Plasticity 를 이용한 나노 인덴테이션의 해석
Abstract
Recent experiments have shown the 'size effects' in micro/nano scale. But the classical plasticity theories can not predict these size dependent deformation behaviors because their constitutive models have no characteristic material length scale. The Mechanism - based Strain Gradient(MSG) plasticity is proposed to analyze the non-uniform deformation behavior in micro/nano scale. The MSG plasticity is a multi-scale analysis connecting macro-scale deformation of the Statistically Stored Dislocation(SSD) and Geometrically Necessary Dislocation(GND) to the meso-scale deformation using the strain gradient. In this research we present a study of nano-indentation by the MSG plasticity. Using W. D. Nix and H. Gao s model, the analytic solution(including depth dependence of hardness) is obtained for the nano indentation , and furthermore it validated by the experiments.
Keywords
- Mechanism - based Strain Gradient(MSG) plasticity;
- Size effect;
- Nano indentation;
- Statistically Stored Dislocation(SSD);
- Geometrically Necessary Dislocation(GND)