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Most Cited Journal Articles 1999-Materials Science

Following is a CAS database record representing a highly cited journal article.

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CAS indexed 5 chemical substances from this document. CAS subject entries for this document include: Ceramic materials and wares; Glass ceramics; Glass, oxide; and 1 additional concept.

CAPLUS COPYRIGHT 2002 ACS

TITLE:	A critical evaluation of indentation techniques for measuring fracture toughness: I. Direct crack measurements
AUTHOR(S):	Anstis, G. R.; Chantikul, P.; Lawn, B. R.; Marshall, D. B.
CORPORATE SOURCE:	Sch. Phys., Univ. New South Wales, 2033, Australia
SOURCE:	J. Am. Ceram. Soc. (1981), 64(9), 533-8 CODEN: JACTAW; ISSN: 0002-7820
PUBLISHER:	American Ceramic Society
LANGUAGE:	English

ABSTRACT:
The application of indentation techniques to the evaluation of fracture toughness of ceramics is examd. crit. The method involves direct measurement of Vickers-produced radial cracks as a function of indentation load. A theor. basis for the method is established, in terms of elastic/plastic indentation fracture mechanics. The radial crack response is affected by the residual component of the contact field. This residual term has important implications concerning the crack evolution, including the possibility of postindentation slow growth under environment-sensitive conditions. Fractog. observations of cracks in selected ref. materials are used to det. the magnitude of this effect and to investigate other potential complications assocd. with departures from ideal indentation fracture. The data from these observations provide a convenient calibration of the indentation toughness equations for general application to other ceramics. The technique is simple in procedure and economic in its use of material.