ENERGY CONCEPT IN COMPARISON OF STATIC AND DYNAMIC HARDNESS

Vytautas Vasauskas, Vytautas Capas

Abstract

This paper outlines the development of a simple predictive model for comparison of static and dynamic hardness. The model is essentially based on the energy - balance considerations and uses work of indentation divided by deforming volume to define hardness. The dynamic hardness was evaluated from measurements of residual contact dimensions and continued force - displacement over the velocity range 1 to 10 m s-1, based on the energy loss models and the energy conservation principle. The total and reversible work of indentation, defined as the respective area under the loading and unloading curves, has also been studied. The correlation between the static and dynamic loading results is satisfying, indicating that the effect of velocity on the energy absorbing is negligible. The obtained value for several engineering metals of dynamic hardness was 1,12?1,40 higher than the static hardness.

Keywords

hardness, static, dynamic

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IMEKO-TC5-2004-025.pdf

DOI

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IMEKO TC

TC5 - Hardness Measurement

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