ISSN: 0884-6804
CODEN: JCTRER
Page Count: 14

Mixed Mode II-Mode III Fracture of Adhesive Joints
Fernlund, G
Graduate student, graduate student, and associate professor, University of Toronto, Ontario

Lanting, H
Graduate student, graduate student, and associate professor, University of Toronto, Ontario

Spelt, JK
Graduate student, graduate student, and associate professor, University of Toronto, Ontario

Abstract

This paper presents approximate closed-form expressions for the local energy release rate in Mode I, Mode II, and Mode III along the idealized straight crack front of a cracked generalized adhesive joint. The development is based on beam theory, the J-integral, and a beam-on-an-elastic-foundation model. Fracture experiments were performed with adhesively bonded split-cantilever-beam (SCB) specimens of different adherend widths and thickness ratios using two different adhesives, and it was seen that the fracture surface had a peculiar stepped arrowhead shape. The analysis and the experiments showed that both the energy release rate and the mode mix vary along the crack front of an SCB specimen, making it unsuitable for the determination of fundamental fracture properties. However, the SCB specimen provided a useful means to test an engineering approach to predict the out-of-plane fracture loads of adhesive joints.

Keywords:
adhesive joints, mixed mode, Mode I, Mode II, Mode III, split cantilever beam, energy release rate, failure prediction, fracture testing

Paper ID: CTR10452J
DOI: 10.1520/CTR10452J
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