Abstract
A damage model is proposed to characterize fatigue crack initiation in notched plates. This is accomplished by assuming a damage fracture criterion and effective instantaneous tangent moduli matrix which accounts for damage accumulation. A finite element package is used to perform the numerical analyses for an edge-notched plate specimen made of Al alloy 2024-T3 under cyclic loading of varying constant amplitudes. The estimated fatigue crack initiation life agrees satisfactorily with those determined experimentally. An important observation from the results of the proposed damage model is its ability to identify the phenomenon of stress redistribution due to material degradation in two-dimension specimens during fatigue loading.
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