汽车工程 ›› 2023, Vol. 45 ›› Issue (2): 293-303.doi: 10.19562/j.chinasae.qcgc.2023.02.014

所属专题: 车身设计&轻量化&安全专题2023年

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多工况碰撞载荷下点阵结构填充吸能盒设计策略研究

梁鸿宇,刘百川,马芳武,王登峰()   

  1. 吉林大学,汽车仿真与控制国家重点实验室,长春  130022
  • 收稿日期:2022-08-04 修回日期:2022-09-02 出版日期:2023-02-25 发布日期:2023-02-21
  • 通讯作者: 王登峰 E-mail:caewdf@jlu.edu.cn
  • 基金资助:
    国家自然科学基金(51975244)和吉林省科技发展计划项目(YDZJ202102CXJD017,20200401144GX)资助。

Research on Design Strategy of Lattice Structure Filled Crash Box Under Multi-angle Impact Loading

Hongyu Liang,Baichuan Liu,Fangwu Ma,Dengfeng Wang()   

  1. Jilin University,State Key Laboratory of Automotive Simulation and Control,Changchun  130022
  • Received:2022-08-04 Revised:2022-09-02 Online:2023-02-25 Published:2023-02-21
  • Contact: Dengfeng Wang E-mail:caewdf@jlu.edu.cn

摘要:

由于点阵结构优异的比吸能特性,其在新能源汽车被动安全方面具有广阔的应用前景。本文中以点阵结构填充吸能盒为研究对象,分别建立了具有不同点阵结构内芯的汽车吸能盒有限元模型,对比分析了不同填充吸能盒与传统吸能盒在多角度斜向碰撞工况下的耐撞性能,阐明点阵结构与吸能盒本体之间的相互作用机理及内芯选择依据。在此基础上,进一步考虑本体诱导槽对多工况变形模式的影响,开展了基于改进本体结构的点阵结构填充式汽车吸能盒抗撞性多目标优化设计。结果表明:具有正六边形点阵结构填充的汽车吸能盒具有稳定且优异的吸能性,基于改进诱导槽的点阵结构填充式吸能盒优化方案相对于原始吸能盒结构减质量32.05%,在保证最大冲击力小于阈值的前提下,其各项综合性能指标均得到显著提升。

关键词: 点阵结构, 吸能盒, 负泊松比, 能量吸收

Abstract:

Due to the excellent specific energy absorption characteristics of lattice structure, it has broad application prospect in the passive safety of new energy vehicles. Taking the crash box filled with lattice structure as the research object, the finite element model of the automobile crash boxes with different lattice structure inner cores are established. The crashworthiness performance of different filling crash boxes and traditional crash box under multi-angle oblique collision conditions are comparatively analyzed. The interaction mechanism between the lattice structure and crash box body and the basis of inner core selection are expounded. On this basis, further considering the influence of the body inducement slot on the deformation modes under multiple working conditions, the multi-objective crashworthiness optimization design of the crash box filled with the lattice structure based on the improved body structure is carried out. The results show that the crash box filled with positive Poisson's ratio lantern-like lattice structure has stable and excellent energy absorbing performance. Compared with the original crash box, the mass is reduced by 32.05% using the optimization scheme. On the premise of ensuring that the maximum impact force is less than the threshold, the comprehensive performance indicators are significantly improved.

Key words: lattice structure, crash box, negative Poisson’s ratio, energy absorption