چكيده به لاتين
Hydroforming is a forming process in which a fluid causes the formation of the blank that can be a sheet or a tube. In this process, using fluid pressure, the blank forms in to the die cavity. Hydroforming is a cost-effective method for metal forming. The most important parameters in tube hydroforming are internal pressure and end axial feed. One of the most important studies in tube hydroforming process is optimization of loading paths. Loading path is defined as how to exert internal pressure and end axial feed versus process time. The main purpose of this research is to maximize formability by detecting the optimal forming parameters. The most significant parameters in the prosperity of tube hydroforming process, are internal pressure and end axial feed. In this paper, a finite element analysis was performed for double-layered tube hydroforming using ABAQUS/Explicit. Numerical results have been verified with experimental results. Using design of experiments (DOE) working with the Taguchi method, loading paths are determined. The regression analysis is carried out to estimate the tubes formability and objective functions as bulge height and the total thickness of tubes at the protrusion peak. For solving the multi-objective optimization problem, the non-dominated sorting genetic algorithm II (NSGA-II) is utilized. Finally, the optimum results obtained from the Pareto optimal front.
Keywords: Tube hydroforming, Finite element method, Loading path, Multi-layer tube, Analysis of regression, Multi-objective optimization
