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ASM Handbook

Mechanical Testing and Evaluation

Edited by
Howard Kuhn
Howard Kuhn
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Dana Medlin
Dana Medlin
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ASM International
Volume
8
ISBN electronic:
978-1-62708-176-4
Publication date:
2000
Book Chapter

Supplemental Articles

Published:
2000

Abstract

A newly developed theory on plasticity makes it possible to include elastic effects, which play a major role when using blunt hardness indenters. This article reviews the new theory and explains several phenomena associated with practical hardness testing. In the indentation hardness test, a blunt indenter that approximates a flat punch is forced into a plane surface. The effective cone angle for most indenters is such that some upward flow results even when there is sufficient material surrounding the indenter to provide a full elastic constraint. When loaded by a blunt indenter, materials with high values of Young's Modulus of Elasticity/uniaxial flow stress (E/Y) (metals) appear to develop a Hertzian stress distribution over the contact. In contrast, materials with low values of E/Y (glasses and polymers) develop a uniform distribution of stress.

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2000. "Supplemental Articles", Mechanical Testing and Evaluation, Howard Kuhn, Dana Medlin

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