Optimum Design Of Metal Thin-Walled Structure For Crashworthiness Analysis

With a stable and remarkable energy absorption capacity, metal thin-walled tube is widely used to improve crashworthiness of the structure and protect the safety of occupant. With the rapid development of computer simulation technology, the nonlinear finite element analysis is commonly used as crashworthiness analysis methods. But the question of grid density effect on the calculation results and the appropriate standard of grid density is still no answer for many years, in addition, on the present stage the study of crashworthiness optimization mostly focused on the theory, and constructed response surface to optimize metal thin-walled which used in engineering practice is extremely rare. Therefore, this paper studied several key issues of crashworthiness optimization of thin-walled tube by the transient nonlinear finite element analysis technology in engineering background, The content is as follow.Methods based on experiment design for constructing the global approximate function is investigated and compared. The effect of thin-walled cylindrical tube with different materials and grid density on failure modes, contact forces and energy absorption has been studied in the low velocity impact cases. giving the proposal of grid density for different subjects. The multi-objective optimization for the thin-walled tube is presented by using the global approximate function method and compared the accuracy by using different construction method. Finally, the thin-walled had been optimized successfully used in the aircraft and achieve the purpose of improving the fuselage crashworthiness.