Shahrood University of Technology Journal of Solid and Fluid Mechanics 2251-9475 5 3 2015 09 23 Optimization of the Initial Blank Shape in hydroforming Double-Stepped Parts Optimization of the Initial Blank Shape in hydroforming Double-Stepped Parts 137 149 582 10.22044/jsfm.2015.582 FA R. Mousavipoor A. Gorji M. Bakhshi Journal Article 2015 01 28 Hydroforming is a suitable solution method for removing complex parts` forming problems such as stepped rectangular parts with uniform thickness distribution and higher quality .Optimization of the initial dimensions of the sheet in the hydroforming process has a large effect on producing products with lower price but higher quality. In this paper, optimizations of the sheet initial dimensions for two different geometries have been studied through sensitivity method. The same curves of formed sheet and final sheet has been seen at the end of the optimization step. In the optimization step, the ABAQUS software has been used to perform the simulation process. The examined parameters in this study are the effect of optimizing of the sheet initial dimensions on the thickness distribution and the maximum forming pressure. It has been concluded that the maximum thinning occurring in the punch radius and in the wall region is reduced by optimizing of the sheet initial dimensions at each stage. It must be mentioned that, investigating the maximum forming pressure shows that by the optimization step, material flow improves so, the maximum pressure will decrease. Hydroforming is a suitable solution method for removing complex parts` forming problems such as stepped rectangular parts with uniform thickness distribution and higher quality .Optimization of the initial dimensions of the sheet in the hydroforming process has a large effect on producing products with lower price but higher quality. In this paper, optimizations of the sheet initial dimensions for two different geometries have been studied through sensitivity method. The same curves of formed sheet and final sheet has been seen at the end of the optimization step. In the optimization step, the ABAQUS software has been used to perform the simulation process. The examined parameters in this study are the effect of optimizing of the sheet initial dimensions on the thickness distribution and the maximum forming pressure. It has been concluded that the maximum thinning occurring in the punch radius and in the wall region is reduced by optimizing of the sheet initial dimensions at each stage. It must be mentioned that, investigating the maximum forming pressure shows that by the optimization step, material flow improves so, the maximum pressure will decrease. https://jsfm.shahroodut.ac.ir/article_582_1979ae69eae4a644c1e114253ac87997.pdf