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Raw materials & technologies, Technologies, Nanotechnology

Modelling of nanoindentation

Thursday, 19 November 2009

To fully characterise the (mechanical) constitutive behaviour of a material, it is often necessary to consider the effects of strain rate.

Dr. James Dean of University of Cambridge is responsible for depth-sensing nanoindentation. This is commonly employed for the purposes to fully characterise a material, like coated sheets. In view of the complexity of the stress and the strain fields, it’s clear that comprehensive analysis, almost certainly involving FEM modelling, will be necessary in order to obtain reliable material property data (other than simple elastic constants). An on-going project is to develop procedures and algorithms for the successful extraction of material constitutive relations using indentation data. These experimental data are accompanied by comprehensive finite element analyses. For the initial approach it was chosen to model the system axisymmetrically, thereby assuming radial symmetry.

The von-Mises stress field is shown at peak indenter depth Quelle: University of Cambridge

The von-Mises stress field is shown at peak indenter depth Quelle: University of Cambridge

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