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TECHNICAL PAPERS

Elastic Analyses of Planar Cracks of Arbitrary Shape

[+] Author and Article Information
Quanxin Guo, Jian-Juei Wang

TerraTek, Inc., 420 Wakara Way, Salt Lake City, UT 84108

R. J. Clifton

Division of Engineering, Brown University, Providence, RI 02912

L. J. Mertaugh

Naval Air Warfare Center Division, Rotary Wing, RW82H Patuxent River, MD 20670

J. Appl. Mech 62(1), 108-115 (Mar 01, 1995) (8 pages) doi:10.1115/1.2895890 History: Received January 19, 1993; Revised August 23, 1993; Online October 30, 2007

Abstract

A numerical method is presented for planar cracks of arbitrary shape. The fundamental solution for a dislocation segment is obtained from the point force solution and used to derive three coupled surface integral equations in which the crack-face tractions are expressed in terms of the gradients of the relative crack-surface displacements. Because the singularity of the kernel in the integral equations is one order less for fundamental solutions based on dislocation segments than for those based on dislocation loops or the body force method, no special numerical techniques are required. Most of the integrations over elements are evaluated analytically. The integral equations are solved numerically by covering the crack surface with triangular elements, and taking the relative displacements to vary linearly over the elements. The mesh is generated by optimizing the local aspect ratio, which is related to the difference in the principal stretches of the mapping of a square reference mesh onto the fracture surface. This mesh generator allows cracks of a wide variety of shapes to be analyzed with good accuracy. Comparison with known solutions indicate that accurate numerical solutions are obtained with a relatively coarse mesh.

Copyright © 1995 by The American Society of Mechanical Engineers
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