Study on bending response characteristics of stepped multi-cell square tube structures
To improve the energy absorption characteristics of thin-walled structures subjected to transverse loading,a novel stepped multi-cell thin-walled structure with layered features was proposed.The transverse bending responses of these multi-cell structures were investigated using a finite element approach.Comparative analysis with the square tube(M1)reveals that utilizing multi-cell structures with equivalent mass as energy absorbers minimizes the initial peak force and improves crushing load efficiency.However,this approach also results in reduced energy absorption capacity and specific energy absorption.In contrast to M1,the proposed stepped multi-cell tubes exhibit lower initial peak force,higher energy absorption capacity,enhanced crushing load efficiency,and improved specific energy absorption under transverse loading.Furthermore,an increase in the number of layers further enhances the comprehensive absorption characteristics of the stepped multi-cell structures.The complex proportion evaluation method was employed to analyze the comprehensive energy absorption characteristics of M1,multi-cell tubes and stepped tubes under transverse loading.The findings designate SM5 as having the optimal comprehensive performance.Additionally,the influences of wall thickness and load angle on transverse bending responses of both M1 and SM5 were analyzed.Across different wall thicknesses and load angles,SM5 consistently demonstrates superior transverse bending characteristics.
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