The Interaction of Two Parallel Semi-Elliptical Surface Cracks Under Tension and Bending

[+] Author and Article Information
W. A. Moussa, R. Bell, C. L. Tan

Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel by Drive, Ottawa, Ontario K1S 5B6, Canada

J. Pressure Vessel Technol 121(3), 323-326 (Aug 01, 1999) (4 pages) doi:10.1115/1.2883710 History: Received November 02, 1998; Revised February 23, 1999; Online February 11, 2008


Multiple cracks are often observed in engineering structures; and their interaction and coalescence may significantly affect their life. Knowledge of the behavior of interacting cracks is very limited. A major component of any linear fracture mechanics model for fatigue crack growth is the calculation of the crack-tip stress intensity factor, SIF. In this paper, a parametric study is presented for two parallel surface cracks in an infinite plate subjected to remote tension or to pure bending loads. The stress intensity factors for these cracks as a function of the crack-front position, depth, shape, and plate thickness are calculated using three-dimensional (3-D) finite element, (FE) analysis. The ratios of crack depth to plate thickness, a/t, and to crack length, a/c, range from 0.1 to 0.62 and 0.1 to 1.0, respectively. Where possible, a comparison of 3-D with 2-D results is also considered.

Copyright © 1999 by The American Society of Mechanical Engineers
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