Abstract: Surface bifurcation is an instability mechanism which appears in the form of surface waviness on traction-free surfaces in ductile solids subjected to large strains. In sheet metal forming, the ...

Abstract: The general asymptotic method proposed in Part I is applied to the investigation of the puckering instability in the hemispherical cup test. Both a membrane and a shell stress state for the ...

Abstract: Based on the theory of damage mechanics, an anisotropic damage coupled mixed isotropic-kinematic hardening plastic model for the prediction of forming limit diagram (FLD) is developed. The model ...