Crashworthiness Simulation And Robust Design Optimization Considering Stamping Process

Both stamping effect and geometrical effect produced during the forming process have important influence on the accuracy of crash simulation. In order to improve the accuracy of crash simulation, this paper analyzes the influence of stamping effect and geometric effect respectively on the collision accuracy. A multi-objective robust optimization method considering stamping process is proposed. The main work in this paper is concluded as follows:The influence of hat-beam fillet and springback deformation under different drawing coefficient on crash simulation are studied. The analyses results indicate that,the fillet and springback deformation have an significant influence on crash response.In order to better study the influence of stamping effect on collision, crash analyses under different conditions are conducted, including considering stamping effect,considering only equivalent plastic strain, considering only thickness and without considering stamping effect. The analyses results indicate that thickness reduction lead to less peak impact force and energy absorption, the equivalent plastic strain lead to the oppsite situation. Crash analyses considering stamping effect can improve the crash simulation precision.In order to improve the crashworthiness of hat-beam, elastic modulus, yield strength and stamping simulation speed are filtered out as noise factor by using orthogonal experimental design method. The geometry and technological parameter are chosen as design variable.The taguchi design method, latin square design method and Kriging model are combined to obtain Dual-Kriging model. At the foundation of that, the robust multi-objective optimization model is constructed to improve stamping performance and crash performance. The multi-objective genetic algorithm is used to solve the optimization model. The final optimal results can be choosen according to practical design principle from the pareto optimal solution set. The results demonstrate that the robust of hat-beam crashworthiness and sheet metal forming are significantly improved.The impact of the stamping process factors are considered in the collision robustness optimization model, it effectively improves the accuracy of crash simulation analysis. This paper has a meaningful duidance to the collision of robustoptimization, and provides a certain reference for the engineering design and analysis.