Fracture prediction of thin plates under localized impulsive loading. Part I: dishing

In Part II, the onset of circumferential cracking and subsequent propagation of radial cracks were predicted analytically and numerically. The accumulated equivalent plastic strain with the stress triaxiality as a weighting function was introduced as a ductile fracture criterion. An accurate representation of the true stress-strain curve and the critical damage/fracture function for AH36 steel material were calibrated from tensile tests on round specimen and parallel numerical simulations. By calculating distributions and histories of stress and strain, the initiation site and extent of fracture were predicted by the present fracture criterion. It was clearly shown that the fracture pattern of thin circular plates consisting of discing followed by petalling can be predicted with great realism provided the fracture criterion is properly formulated.