粘接多胞管三点弯曲实验与数值研究

基于实验和数值模拟方法，本文研究了一种易制备粘接多胞薄壁结构的弯曲性能，分析了粘接多胞管在横向三点弯曲加载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，但在某些情况下粘接可以带来70%的性能提升。借助于LSDYNA，我们计算模拟了三点弯曲实验，计算得到的粘接多胞管变形模式和力-位移曲线与实验结果吻合良好。此外，采用计算模拟方法，我还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：如果未出现明显的粘接脱开，则粘接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。

Experimental and numerical study on three-point bending of adhesive multi-cell tubes

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 loads 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 single-cell tubes and in some case up to 70% can be achieved due to the effect of adhesive. Numerical simulations of the three-point bending tests are conducted by LSDYNA. The simulated deformation pattern and punch force-displacement curves are in good agreement with experiment results. In addition, three different interface conditions are simulated to analyze and compare the response of adhesive multi-cell tubes. Results show that 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 will be seriously weakened.