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Finite element simulation of pure shear extrusion process with back pressure
M. Irani(이라니 미쌈),M. S. Joun(전만수) 한국소성가공학회 2015 한국소성가공학회 학술대회 논문집 Vol.2015 No.10
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.
M. Irani(이라니 미쌈),M. S. Joun(전만수) 한국소성가공학회 2016 한국소성가공학회 학술대회 논문집 Vol.2016 No.4
In this study, plane-strain elastoplastic finite element model is developed to predict the residual stress in the surface layer of ultrasonic surface rolled material. During ultrasonic surface rolling process elastoplastic loading by a mass of high energy successive impacts is exerted in a small zone of the surface. A two dimensional elastoplastic finite element model is employed to simulate the process. Results of parametric study showed that the magnitude and depth of maximum residual stress are increased by applying higher static forces. Moreover, the variation of residual stress along the surface of material revealed that the distribution of residual stress is not homogeneous on the surface of ultrasonic surface rolled material.