Self-calibration in compliance and indenter tip defect for instrumented indentation
Journal of Materials Research(2022)
摘要
The accuracy in the determination of the mechanical properties by instrumented indentation strongly depends on the indenter/material contact area, the corrective compliance, and the indenter tip defect. For the calibration, we suggest to combine 3 functions: (i) a Force-function, where only the corrective compliance term is the unknown parameter, (ii) an Area-function, allowing the estimation of the tip defect knowing the corrective compliance, and finally (iii) a Martens-function, to determine the Martens hardness. The proposed methodology is validated on a series of experiments performed between 2006 and 2015 on ceramics and metals using the same indentation instrument and the same Vickers indenter having undergone different blunts. As a main result, the Young’s moduli are found very close to that available in literature if a β-factor is introduced into the Area-function and Force-function. In addition, both the instrumented hardness and Martens hardness do not vary with the indentation force. Graphical abstract
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关键词
Nano-indentation,Hardness,Elastic properties,Microscale,Standards
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