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Abstract

The static indentation behaviour of metallic materials, especially with a spherical indentor, has been well studied and a procedure for conversion of hardness versus indentation diameter data to flow stress–plastic strain data utilising the concepts of constraint factor and representative strain due to Tabor, has been well established on the basis of a large number of experiments and numerical simulations. In contrast, the dynamic indentation (DI) hardness behaviour of metallic materials, characterised by ultrahigh strain rate plastic deformation under adiabatic conditions, is poorly understood. In particular, it is not clear whether the concepts valid for static indentation are equally valid under DI conditions. The above aspects of DI are discussed in light of recent results on DI obtained in the author's laboratory.

Keywords

Dynamic indentation Dynamic flow stress Dynamic softening Specific energy absorption capacity Strain rate sensitivity Review

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Understanding dynamic indentation behaviour of metallic materials

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