Journal of the Society of Materials Science, Japan
Online ISSN : 1880-7488
Print ISSN : 0514-5163
ISSN-L : 0514-5163
Original Papers
Effect of Elastic-Plastic Constitutive Relationship on Superficial Rockwell Hardness
Akihiko HIRANOMasao SAKANENaomi HAMADA
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2006 Volume 55 Issue 4 Pages 409-415

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Abstract

This paper studies the relationship between Superficial Rockwell hardness and elastic-plastic material constants by finite element (FE) analysis. Finite element analyses for Superficial Rockwell hardness were carried out to study the effects of elastic-plastic material constants and friction on the hardness. The hardness increased with increasing yield stress and strain hardening coefficient but it decreased with increasing strain hardening exponent. A new equation was proposed for predicting the hardness from yield stress and strain hardening coefficient and exponent. The equation predicted the FE and experimental results within a small scatter. The critical thickness of specimen was discussed based on the extent of plastic deformation and the experimental results. The friction between indenter tip and specimen upper face had almost no influence on the hardness.

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© 2006 by The Society of Materials Science, Japan
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