Crashworthiness Optimization Design of Thin-Walled Tube Filled with Re-entrant Triangles Honeycombs  

作　　者：Fangwu Ma Ying Zhao Guowang Wang Liang Wu Yongfeng Pu 

机构地区：[1]State Key Laboratory of Automotive Simulation and Control,Jilin University,5988,Renmin Ave.,Changchun 130025,China

出　　处：《Automotive Innovation》2019年第1期1-13,共13页汽车创新工程（英文）

基　　金：National Nature Science Foundation of China(No.2016YFB0101601);Jilin Province Scientific Research Program(No.SXGJQY2017-7)。

摘　　要：A novel re-entrant triangles-filled tube(RTT)is proposed through decoupling structural stiffness and energy absorption.Inner re-entrant triangles are employed to satisfy energy absorption,and outer thin wall is used to acquire high stiffness.This paper starts from establishment of theoretical models between geometric parameters of re-entrant triangles and relative density,equivalent elastic modulus and energy absorption characteristics,which are validated by experiments.On this basis,the optimal geometric parameters of unit cell are sought to maximize unit volume energy absorption and minimize relative density by adopting NSGA-II method.Subsequently,the cross-section of tube with optimal stiffness is obtained with targets for maximizing axial stiffness and lateral stiffness by employing static topology optimization method.To verify the proposed optimization method,RTT is analyzed and compared with positive Poisson’s ratio foam-filled tube(PFT),non-filled traditionally optimized tube(NTT)and pre-optimized square tube(PST).The results show that the novel RTT can improve stiffness and energy absorption performance simultaneously.Compared with the positive Poisson’s ratio material,re-entrant triangles honeycomb shows superior advantages in energy absorption.In comparison with the PFT,energy absorption of the RTT increases by 17.23%,and the peak crush force reduces by 5.04%.Therefore,the proposed decoupling design method demonstrates superiority in satisfying various performance requirements simultaneously.

关 键 词：Thin-walled tube Re-entrant triangles honeycomb Multi-objective optimization Energy absorption Structural stiffness 

分 类 号：TN9[电子电信—信息与通信工程]