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The presence of a flaw or crack near a bolt-loaded hole can significantly reduce the strength of a mechanical joint. Stress intensity factors of mixed-mode cracks emanating from a bolt-loaded hole in a loaded finite composite are evaluated here using the finite element method. Both a horizontal crack adjacent to the bolt and a vertical crack beneath the bolt of a mechanical joint are studied. Linear elastic fracture mechanics is used, and the bolt is assumed to be rigid. The contact stresses are evaluated rather than assumed. Effects of friction, both clearance, geometric nonlinearity between the bolt and the composite, variations in geometry (end distance, crack length, and edge distance), and material properties are accommodated. The magnitudes of the stress intensity factors are found to be highly influenced by variations in the material properties, crack length, and in-plane geometry.
Professor, University of Wisconsin, Madison, WI
Assistant professor, University of Detroit Mercy, Detroit, MI
Stock #: CTR10231J