Abstract

Thin-walled tubes are extensively used in the automotive industry because of their high energy absorption capacity and lightweight advantages. These structures are expected to have high energy absorption and low peak force during any collision. In this study, to obtain low peak crushing force, different wall lengths have applied to the thin-walled tubes. Different wall lengths have investigated using doubly-walled walled, inner multi-cell walled and multi-cell walled tubes obtained from square, hexagon, octagon and circle cross-sections. To evaluate crashworthiness performance dynamic impact analyses at a constant velocity are carried out using the non-linear explicit Finite Element (FE) code Radioss. According to the FE results, tubes with different wall lengths give lower peak crushing force (PCF) of up to 36% compared to normal tubes. On the other hand, in tubes with different wall lengths, there is a decrease of up to 6% in specific energy absorption (SEA) compared to normal tubes. Thus, considering the decrease of the PCF, the advantage of tubes with different wall lengths is presented. Optimization studies have carried out for the second type octagonal tube with different wall lengths (O2G) and the third type octagonal tube with different wall lengths (O3G) which give better SEA and PCF values between all tubes.

摘要

薄壁管因其高能量吸收能力和轻质优势而广泛应用于汽车行业。预计这些结构在任何碰撞过程中都具有高能量吸收和低峰值力。在这项研究中，为了获得低峰值破碎力，不同的壁长应用于薄壁管。使用从方形、六边形、八边形和圆形横截面获得的双壁壁、内多孔壁和多孔壁管研究了不同的壁长。为了评估耐撞性能，使用非线性显式有限元 (FE) 代码 Radioss 进行恒速下的动态冲击分析。根据有限元结果，与普通管相比，具有不同壁长的管的峰值压碎力 (PCF) 低达 36%。另一方面，在具有不同壁长的管子中，与普通管子相比，比能量吸收 (SEA) 降低了 6%。因此，考虑到 PCF 的降低，呈现出不同壁长管的优势。对具有不同壁长 (O2G) 的第二类八角形管和具有不同壁长 (O3G) 的第三类八角形管进行了优化研究，从而在所有管之间提供了更好的 SEA 和 PCF 值。