Mechanical responses of L450 steel under biaxial loading in the presence of the stress discontinuity

The Lüders plateau behaviour is a phenomenon of stress discontinuity associated with strain localisation which can affect the fracture mild steel subjected to plastic strains. Together experimental studies biaxial loading tests digital image correlation (DIC), this work considers effect on mechanical L450 loading, using so-called “up-down-up” (UDU) constitutive model in finite element analyses (FEA) cruciform specimens. softening modulus UDU and ratio were found significantly simulated evolution band. A method has been proposed use appropriate parameters capture characters bands conditions. Based selected parameters, formation illustrated distribution force-displacement studied over full range under