Service loading imposed on engineering structures is often arbitrary or nonproportional. The paper presents an investigation of examining the effects of proportional and nonproportional loadings on the fracture behavior of mixed mode fracture. The anisotropic model of continuum damage mechanics capable of taking into account the nonproportional loading condition recently developed by the authors is employed and the computed results reveal that different modes of proportional and nonproportional loading have marked effects on the fracture load, angle of crack initiation, overall damage, and directional change of the principal planes of stress and damage.

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