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Fracture Toughness of Diamond Measured by Vickers Indenter Reloading Technique

Published online by Cambridge University Press:  15 February 2011

Sergey N. Dub
Sergey N. Dub*
Affiliation:
Institute for Superhard Materials of the Ukrainian National Academy of Sciences, 2 Avtozavodskaya Str., Kiev, 254074, Ukraine
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Abstract

The crack initiation sequence during Vickers indenter penetration into the (100) plane of diamond was observed. It was revealed that for <110> orientation, two median cracks are initiated during the loading half of the cycle. In unloading, the median cracks grow toward the surface and turn into half-penny cracks. It was proposed to use half-penny cracks as initials and evaluate fracture toughness in second loading from a crack-starting load for these cracks. The length of initial half-penny cracks was measured after first loading cycle from opposite side of the sample. Test results obtained by the reloading technique agree well with the data on conventional fracture toughness determination by indentation from the length of cracks after unloading.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 383: Symposium I – Mechanical Behavior of Diamond and Other Forms of Carbon , 1995 , 255
Copyright
Copyright © Materials Research Society 1995

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