investigation on indication of wrinkling and bursting in tube hydroforming process using apdl

determination of the optimum loading path (internal pressure- axial feeding) to restrict the bursting, buckling and wrinkling through tube hydroforming process is necessary to produce an acceptable tube. in this paper, the wrinkling and fracture criteria are implemented to an finite element code devoted to the simulation of tube hydroforming processes. using the ansys parametric design language (apdl), two macros are built to compute the value of bursting and wrinkling indicators through the elements. by determining the indicators values through the step to step solution of the software, it is possible that compares them with critical values and predicts the fracture and wrinkling in tube hydroforming process.