SEDL / STP / STP1236-EB / STP13049S

Stress Intensity Factors for Surface and Corner-Cracked Fastener Holes by the Weight Function Method

Zhao, W
Post-doctoral fellow and institute professor, Computational Modeling Center, Georgia Institute of Technology, Atlanta, GA
University of South Carolina, Columbia, SC

Atluri, SN
Post-doctoral fellow and institute professor, Computational Modeling Center, Georgia Institute of Technology, Atlanta, GA

Pages: 13    Published: Jan 1995

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Abstract

The paper presents stress intensity factor solutions for surface and corner-cracked fastener holes by using an efficient and accurate three-dimensional weight function method. The approach is briefly described. Stress intensity factors for crack-face pressure loads of the type (x/r)n are provided, where n varies from 0 to 4. The geometry parameters considered are as follows: the ratio of the hole radius to plate thickness r/T = 1.5 (T = t for corner cracks, T = 2t for surface cracks); the crack aspect ratio a/c = 0.5, 1, and 1.5; the ratio of crack depth-to-plate thickness a/t = 0.1, 0.3, and 0.5. Based on the given solutions and the superposition principle, stress intensity factors for other load cases may be easily obtained. Examples are given for remote tension, biaxial tension, wedge loading in the hole, and simulated pin loading. Also, the effect of the residual stress field following cold expansion is considered for the remote tension loading condition.