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In hydroforming process, the curve of internal pressure versus axial feeding is called loading path which is the key to produce a desire product. Finite element simulation of tube hydroforming can be used to study the loading path effect on the final part characteristics. In this research the finite element simulation of pulsating hydroforming process has been done in conjugation with two different work hardening models: an isotropic hardening and a mixed isotropic-nonlinear kinematic hardening model, which is capable to describe the Bauschinger effect. The parameters of both hardening models have been obtained from tensile test data. The result of the both finite element simulations were compared to experimental work. The results show that the mixed hardening model gets better prediction of final product characteristics than isotropic hardening. The differences between the results of two hardening models are from this fact that in a hydroforming process the tensile and compression loads are used and the loads reversal may be occurred. To study the effect of pulsating pressure on tube material characteristic, a three-step bulge test with unloading has been done and the results have been compared to monotonic bulge test. Loading and unloading of internal pressure cause a higher bulge height for a final pressure level compared to monotonic bulge height. The finite element simulation of pulsating hydroforming has been compared to linear hydroforming. The reported bulge heights and thicknesses show an improvement in formability of tubular material in pulsating hydroforming by considering the average pressure level which was applied.

Keywords: "Pulsating Hydroforming", "Finite Element Method", "Isotropic Hardening", "Mixed Isotropic-Nonlinear Kinematic Hardening"

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