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Most Cited Journal Articles 2001-Materials Science

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

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CAS indexed 4 chemical substances from this document. CAS subject entries for this document include: Elasticity; Hardness; Glass, oxide; and 1 additional concept.

CAPLUS COPYRIGHT 2002 ACS

TITLE:	An improved technique for determining hardness and elastic modulus using load and displacement sensing indentation experiments
AUTHOR(S):	Oliver, W. C.; Pharr, G. M.
CORPORATE SOURCE:	Met. Ceram. Div., Oak Ridge Natl. Lab., Oak Ridge, TN, 37831-6116, USA
SOURCE:	J. Mater. Res. (1992), 7(6), 1564-83 CODEN: JMREEE; ISSN: 0884-2914
PUBLISHER:	Materials Research Society
LANGUAGE:	English

ABSTRACT:
The indentation load-displacement behavior of six materials tested with a Berkovich indenter was carefully documented to establish an improved method for detg. hardness and elastic modulus from indentation load-displacement data. The materials included fused silica, soda-lime glass, and single crystals of aluminum, tungsten, quartz, and sapphire. The load-displacement curves during unloading are not linear, even in the initial stages and suggest that the flat punch approxn. used so often in the anal. of unloading data is not entirely adequate. An anal. technique is presented that accounts for the curvature in the unloading data and provides a phys. procedure for detg. the depth which is used in conjunction with the indenter shape function to establish the contact area at peak load. The hardness and elastic modulus were computed by using the anal. procedure and compared with values detd. by independent means to assess the accuracy of the method. With good technique, moduli are measured to within 5%.