Fatigue and fracture of plane elements with sharp notches under biaxial loading

摘要

Theoretical,numerical and experimental investigations on fatigue and fracture of plane rectangular elements with opposite V-notches of various opening anales are presented.Two materials- a ductile aluminum alloy and brittle PMMA - were used to analyse damage processes under biaxial loading conditions,as tension and shear.Experiments have shown that material properties strongly affect the damage process in both monotonic and variable loading.Fracture mode,fatigue crack direction and shape depend on material properties,notch angle and tension/shear ratio.The explanation of this behaviour is based on an elastic-plastic FEM analysis for the aluminium alloy and a non-local damage accumulation criterion for the PMMA.