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A method is presented for the calculation of mixed-mode stress-intensity factors for three dimensional crack fronts. The method uses the nodal forces for the calculation. The strength of this approach is the accuracy of nodal force calculations and the avoidance of the assumption of plane strain. The methodology is described for general crack fronts. The special case of a straight crack front is presented in detail. An example problem is solved with a reference solution. The results of the present method agree to within 3% of the reference value.
three-dimensional stress-intensity factors, curved crack front, finite-element method, fracture mechanics, mixed-mode fracture
Associate professor of engineering, School of Engineering and Applied Science, The George Washington University, Washington, DC