Indenter Tip Radius and Micro-Indentation Hardness
Using finite element method with the conventional J 2 theory and strain gradient theory respectively, the effect of the indenter tip radius on the micro-indentation hardness is investigated in the present paper. It is found that the former can not predict the size effect even considering the indenter tip radius, while the latter gives a good agreement to the experimentally measured micro-indentation hardness, which confirms that the size effect of micro-indentation hardness does exist due to the factor of the strain gradient effect.
Key wordsfinite element method size effect micro-indentation hardness indenter tip radius conventional J2 theory strain gradient theory
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