Surface crack growth subject to bending and biaxial tension-compression

摘要: Fatigue surface crack growth and the in-plane out-of-plane constraint effects are studied through experiments computations for aluminium alloy D16T. Subjects studies cruciform specimens under different biaxial loading bending central notched with external semi-elliptical crack. Both optical microscope measurements opening displacement (COD) method used to monitor calculate both depth length during tests. The variation of rate paths behaviour is cyclic pure tension-compression fatigue loading. This work centered on relations between size free specimen considered configurations, COD aspect ratio conditions. For experimental in tested T-stress, local triaxiality parameter h, TZ factor governing 3D-fields stresses strains at tip form In-integral were calculated as a function by finite element analysis characterization along front. plastic stress intensity approach applied well deepest point As result or front positions accumulated number cycle obtained.