ISSN: 1945-7553
CODEN: JTEVAB
Page Count: 9

A Suggested Procedure for Combined Mode I — Mode III Fracture Toughness Testing

Manoharan, M
Research Associate, Case Western Reserve University, Cleveland, OH

Hirth, JP
Professor, Washington State University, Pullman, WA

Rosenfield, AR
Research Leader, Battelle Memorial Institute, Columbus, OH

(Received 7 April 1989; accepted 7 September 1989)

Abstract

Mode I fracture toughness testing is well developed and standards exist for determining both Mode I critical stress intensity factors and J integrals. However, combined Mode I — Mode III testing is not so well developed and no standards exist. The aim of this paper is to suggest a testing procedure for studying mixed-mode crack initiation and growth under linear-elastic and elastic-plastic conditions. Suitably defined formulations of the stress intensity factor denoted Kic and Jiiic were used to characterize linear elastic fracture. Under elastic-plastic conditions, suitable versions of the J integral denoted Jic and Jiiic were used to characterize crack initiation and the slopes of the resolved J resistance curves to characterize crack growth. Effects caused by surface rubbing which operate at high values of the Mode III/Mode I ratio are recognized as a complication in interpreting the data.

Keywords:
fracture toughness, mixed-mode fracture, combined mode fracture, fracture testing, Mode I — Mode III fracture, mixed-mode crack growth, combined mode crack growth

Paper ID: JTE12460J
DOI: 10.1520/JTE12460J
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