新型波纹结构吸能盒耐撞性研究

doi:10.3969/j.issn.1674-8484.2022.03.006

摘要/Abstract

摘要：

为了提升汽车的被动安全性能,进行了新型波纹结构吸能盒设计与耐撞性研究。建立了有限元模型,对比分析了具有不同波纹形状的等距连续波纹管与等距离散波纹管的变形模式与吸能特性,对等距连续波纹管的波纹参数、壁厚进行了多目标优化设计。结果表明：当波纹数量大于或等于8时,等距连续波纹管在轴向压缩下发生稳定变形;多目标优化设计所得的等距连续波纹管与相同结构参数的等距离散波纹管相比较,比吸能基本保持不变,初始峰值载荷降低了14.31%。等距连续波纹吸能盒较传统等距离散波纹吸能盒具有更加优良的吸能特性,在提升汽车被动安全领域具有重要的应用价值。

关键词: 被动安全, 耐撞性, 吸能盒, 波纹薄壁结构, 多目标优化

Abstract:

A novel crush box with corrugated structures was designed and its crashworthiness was investigated to improve the passive safety of vehicles. A finite element model was established to compare the deformation modes and energy absorption properties of the equidistant continuous corrugated tube with that of the equidistant discrete corrugated tube with different corrugated shapes. It was conducted that the multi-objective optimization on the parameters of corrugated shape and the thickness of equidistant continuous corrugated tube. The results show that the equidistant continuous corrugated tube deforms stably under axial compression when the number of corrugations is greater than or equal to 8. Compared with the equidistant discrete tube, the specific energy absorption remains basically unchanged, and the initial peak crush force is reduced by 14.31%, showing that the equidistant continuous corrugated crush box has better energy absorption characteristics than the traditional equidistant discrete corrugated crush box, and it has important application value in the field of improving the passive safety of vehicles.

Key words: passive safety, crashworthiness, crush box, corrugated structure, multi-objective optimization

中图分类号:

U463.83

罗耿, 赵剑南, 陈亮, 柴成鹏, 王童, 陈轶嵩. 新型波纹结构吸能盒耐撞性研究[J]. 汽车安全与节能学报, 2022, 13(3): 453-462.

LUO Geng, ZHAO Jiannan, CHEN Liang, CHAI Chengpeng, WANG Tong, CHEN Yisong. Research on the crashworthiness of a novel crush box with corrugated structures[J]. Journal of Automotive Safety and Energy, 2022, 13(3): 453-462.

图/表 26

参考文献 23

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密度, ρ	2 700 kg / m³
弹性模量, E	73.32 GPa
泊松比, μ	0.3
屈服应力, σ_y	66.41 MPa
极限拉应力, σ_u	158.75 MPa
应变硬化指数, n	0.174 6

密度, ρ	2 700 kg / m³
弹性模量, E	73.32 GPa
泊松比, μ	0.3
屈服应力, σ_y	66.41 MPa
极限拉应力, σ_u	158.75 MPa
应变硬化指数, n	0.174 6

	IPCF kN	E_A J	SEA kJ·kg^-1	MCF kN	CFE%	ULC
实验值	9.86	602.24	5.47	6.69	69	0.08
仿真值	9.93	605.95	5.51	6.73	68	0.08
误差 / %	0.71	0.61	0.71	0.64	1.8	4.31

	IPCF kN	E_A J	SEA kJ·kg^-1	MCF kN	CFE%	ULC
实验值	9.86	602.24	5.47	6.69	69	0.08
仿真值	9.93	605.95	5.51	6.73	68	0.08
误差 / %	0.71	0.61	0.71	0.64	1.8	4.31

H mm	IPCF kN	E_A J	SEA kJ·kg^-1	MCF kN	CFE	ULC
0.5	0.899 63	50.232 88	1.947 01	0.837 21	0.930 62	0.865 11
1.0	3.062 75	179.721 30	3.476 23	2.995 36	0.978.00	0.094 27
1.5	6.623 35	406.772 20	5.248 67	6.779 54	1.023 58	0.772 61
2.0	11.652 80	758.608 50	7.365 13	12.643 47	1.085 02	0.878 22