NUMERICAL ANALYSIS AND OPTIMIZATION OF CRASHWORTHINESS OF BIONIC HIERARCHICAL THIN-WALLED SQUARE TUBES
XU Fei
QIN RuiXian
CHEN BingZhi
Abstract：In order to improve the energy absorption efficiency of the conventional thin-walled square tube,a bionic hierarchical thin-walled square tube(BHST)was proposed by the microscopic trabecular structure of beetle wing sheaths.Based on the super folding element theory,a theoretical model of the mean crushing force of the bionic hierarchical thin-walled square tube was established.The axial energy absorption characteristics of the bionic hierarchical thin-walled square tube and the conventional multi-cell thin-walled square tube were analyzed by the nonlinear finite element method,and the influence of structural parameters on the crashworthiness of BHST4-2 structure was studied.The results show that the theoretical predictions match with the numerical simulation results,and the relative errors are all within 7％.The bionic hierarchical thin-walled square tube exhibits excellent crashworthiness.The wall thickness has a more significant effect on the crashworthiness of BHST4-2 structure than the second-order square tube edge length.The radial basis function(RBF)model and the genetic algorithm were used for the multi-objective optimization of the BHST4-2 structure,and optimal parameters of the structure were obtained.The results of the study provide new ideas for the design of thin-walled square tubes with excellent energy absorption properties.
Keywords：Bionic hierarchical thin-walled square tubeSuper folding element theoryParameter analysisCrashworthinessMulti-objective optimization
Publication Date：2024-06-15
Online Publishing Date：2026-09-12(First online date of this platform, not the publication date of the document)
Pages：8( 618-625 )