粘接多胞管三点弯曲实验与数值研究

Experimental and Numerical Study on Three-point Bending of Adhesive Multi-cell Tubes

基于实验和数值模拟方法,论文对一种易制备粘接多胞薄壁结构的弯曲性能进行了研究,分析了粘接多胞管在横向三点弯曲载荷作用下的变形和能量吸收性能.三点弯曲准静态实验表明由于粘接的作用,通常情况下粘接多胞管的能量吸收性能高于其基本构成单胞管能量吸收的总和,某些情况下粘接可以最高带来近70%的性能提升.基于有限元软件LS-DYNA,对三点弯曲实验进行了数值模拟仿真,计算得到的结构变形模式和力-位移曲线与实验结果吻合良好.此外,采用数值方法,对三种不同接触条件下的结构响应进行了对比分析,结果表明若未出现明显的粘接脱开,则多胞管的吸能特性与完整的多胞结构相当,否则其能量吸收性能会被严重削弱.

A novel type of easily-prepared adhesive multi-cell tube is investigated experimentally and numerically in this paper.The deformation and energy absorption performance of the multi-cell tubes under three-point bending are analyzed.The quasi-static three-point bending tests reveal that the energy absorption capacity of adhesive multi-cell tubes is generally higher than the summation of their constituent singlecell tubes,and in some cases,an increment up to 70%can be achieved due to the effect of adhesive.Numerical simulations of the three-point bending tests are conducted by using LS-DYNA.The simulated deformation patterns and punch force-displacement curves are in good agreement with the experimental results.In addition,the responses of adhesive multi-cell tubes under three different interface conditions are simulated and compared.Results show that the energy absorption characteristics of adhesive multi-cell tubes are comparable to traditional multi-cell tubes if there is no obvious adhesive detachment;otherwise,the performances of adhesive multi-cell tubes are seriously weakened.