Abstract
Crack tip stress intensity factors for the cracks in variable thickness plates having a fillet subjected to tensile (mode I) loadings were obtained by three-dimensional finite element analysis. Stress intensity factors were calculated by the crack opening displacement method proposed by Ingraffea and Manu [ Int. J. numer. Meth. Engng 15, 1427–1445 (1980)]. The correction factor of the stress intensity factors was introduced in the form of F (λ, β, ω, ρ). And characteristics of the fatigue crack propagation behavior near the thickness interface were examined for 7075-T6 aluminum specimens. A series of thin-to-thick type variable thickness specimens having a fillet (CCT type) was prepared. Fatigue tests were performed under load control in tension-tension.
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