Abstract

The aim of this study is to investigate the improvement in energy absorption of a top-hat profile hollow-section beam by attaching different shapes of internal reinforcements. The base structure of the beam was first considered as a hat shape structure which was jointed to a flat plate using spot-welds. Three types of sheet metal reinforcements were formed and attached inside the beam’s structure. Then, they were tested experimentally under quasi-static three-point bending loading condition. Also, these reinforced structures were numerically simulated using LS-DYNA explicit code. After the numerical simulation is validated using experimental data, some new cross-sections were proposed for reinforcing component, and the specimens’ performance were studied based on the total energy absorption and the specific energy absorption (SEA) parameters. Furthermore, the effects of different assembly methods, such as joint areas and arrangement of spot-welds, were numerically investigated in order to obtain the best configuration to manufacture the reinforced top-hat profile beam. The results for the best crashworthiness characteristics are presented, discussed, and commented upon.

摘要

本研究的目的是研究通过附加不同形状的内部加强件来提高顶帽型空心截面梁的能量吸收。梁的基础结构首先被认为是一个帽形结构，它使用点焊连接到一个平板上。在梁的结构内形成并连接了三种类型的钣金加强件。然后，在准静态三点弯曲加载条件下对它们进行了实验测试。此外，这些加固结构使用 LS-DYNA 显式代码进行了数值模拟。在利用实验数据对数值模拟进行验证后，提出了一些新的增强构件截面，并根据总能量吸收和比能量吸收（SEA）参数研究了试件的性能。此外，对不同装配方法的影响，如接头面积和点焊布置，进行了数值研究，以获得制造增强顶帽型材梁的最佳配置。展示、讨论和评论了最佳耐撞特性的结果。