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The indentation load/size effect and the measurement of the hardness of vitreous silica

Authors
Journal
Journal of Non-Crystalline Solids
0022-3093
Publisher
Elsevier
Publication Date
Volume
146
Identifiers
DOI: 10.1016/s0022-3093(05)80492-2

Abstract

The indentation load/size effect (ISE) for the Knoop microhardness measurement of vitreous silica is considered for indentation in different test environments. Analysis was through the application of Meyer's Law, the Hays/Kendall approach of a critical load for the initiation of flow and the proportional specimen resistance (PSR) model proposed by Li and Bradt. The PSR model in combination with a normalized form of Meyer's Law was found to describe consistently the measurements and to yield a load-independent Knoop microhardness for fused silica of 540 kg/mm 2. The model also explains the effects of different indentation test environments, suggesting the effect is a result of their lubricating effects at the indenter facet/specimen interface.

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