Finite element simulation of pure shear extrusion process with back pressure

In this study, the effect of back pressure on filling fraction of exit channel in pure shear extrusion (PSE) process is investigated by FEM. For this purpose, the back pressure is applied to a plunger located at the beginning of exit channel and its influences on the filling fraction of die are studied. To validate the accuracy of the model, the predicted results of the PSE simulation without back pressure are compared with some experimental results reported in previous studies and a good agreement found between two sets of results. The results show that imposing back pressure of 200 MPa leads to an acceptable filling fraction of exit channel to produce a sound severe plastic deformed billet.