多工况碰撞载荷下点阵结构填充吸能盒设计策略研究

doi:10.19562/j.chinasae.qcgc.2023.02.014

Abstract

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

Hongyu Liang,Baichuan Liu,Fangwu Ma,Dengfeng Wang. Research on Design Strategy of Lattice Structure Filled Crash Box Under Multi-angle Impact Loading[J].Automotive Engineering, 2023, 45(2): 293-303.

Figures/Tables 18

构型	$S E A θ - L M /$ （J·kg^-1）	$F a v θ - L M$ /kN	$F P θ - L$ /kN	$σ E θ - L M$
4∶1	6 351	20.60	129	0.70
2∶1	8 445	28.31	129	0.41
4∶3	9 941	31.93	129	0.29
1∶1	11 608	35.72	129	0.22

序号	l/mm	α	β	γ	T	$F P θ - L /$ kN	$F a v θ - L /$ kN	$S E A θ - M /$ （J·kg^-1）
1	8.10	0.133	1.006	26.34	1.585	34.43	9.38	4 515
2	8.98	0.140	0.787	33.66	1.439	34.08	14.71	7 777
3	11.90	0.062	1.079	28.78	1.488	36.26	18.41	7 390
4	11.81	0.126	1.152	27.32	1.244	33.65	14.69	5 756
5	9.66	0.057	0.823	32.20	2.902	98.67	52.21	14 737
6	12.00	0.111	0.970	31.71	2.415	127.42	45.85	10 337
7	10.54	0.106	0.945	32.68	1.000	19.50	9.15	5 282
8	11.12	0.060	0.933	38.54	1.683	48.70	21.82	8 416
9	10.44	0.096	0.921	40.00	2.707	103.65	51.67	12 525
10	8.88	0.055	1.030	37.56	2.220	79.10	35.28	11 617
11	10.24	0.150	0.982	35.12	2.171	71.16	38.43	10 703
12	11.22	0.070	0.799	28.29	2.073	56.27	28.44	10 514
13	11.51	0.065	1.067	25.37	2.854	113.72	55.77	13 277
14	8.68	0.143	1.165	29.76	2.561	88.99	46.95	12 184
15	8.39	0.099	1.018	37.07	1.341	26.88	12.41	7 139
16	8.78	0.104	1.104	20.00	2.366	66.98	33.17	10 245
17	8.59	0.138	0.884	24.39	2.756	103.70	41.38	13 751
18	11.71	0.101	0.994	20.49	1.976	52.96	28.20	9 602
19	10.63	0.092	1.250	25.85	2.122	64.36	33.62	9 329
20	11.61	0.145	0.860	27.80	1.537	46.54	20.22	7 283
21	10.73	0.128	1.055	23.90	2.951	104.20	57.49	13 646
22	11.32	0.116	0.774	38.05	1.732	48.51	23.26	8 200
23	10.34	0.121	0.750	30.73	2.610	87.09	46.79	13 325
24	10.15	0.148	1.140	22.44	1.878	53.61	29.35	9 680
25	9.76	0.052	1.043	22.93	2.024	53.29	26.19	10 316
26	9.46	0.094	1.128	23.41	1.098	20.11	9.61	5 858
27	9.95	0.084	0.848	20.98	2.805	83.03	47.10	14 040
28	9.37	0.050	0.957	31.22	1.195	23.60	10.01	6 443
29	8.20	0.079	1.213	29.27	1.927	52.39	24.94	10 495
30	9.56	0.135	1.201	33.17	1.390	37.85	16.39	6 527
31	8.29	0.118	0.909	36.10	2.512	82.44	41.27	12 678
32	9.17	0.082	0.762	35.61	1.829	44.72	20.46	8 824
33	8.00	0.077	0.896	26.83	2.268	55.72	27.17	11 115
34	10.83	0.074	0.872	21.95	1.049	17.49	7.69	5 650
35	8.49	0.089	0.811	24.88	1.146	18.24	8.05	6 828
36	9.07	0.109	1.189	39.51	2.317	71.47	39.02	10 742
37	10.05	0.072	1.226	34.63	1.293	33.52	13.60	6 205
38	9.27	0.087	1.091	30.24	3.000	120.11	59.85	14 317
39	10.93	0.067	1.177	36.59	2.463	98.86	44.23	11 639
40	11.02	0.131	1.238	34.15	2.659	107.54	53.12	10 072
41	9.85	0.123	0.835	21.46	1.780	45.24	19.77	8 279
42	11.42	0.113	1.116	39.02	1.634	52.89	24.23	7 145
43	8.00	0.130	1.050	40.00	2.200	62.19	32.07	10 884
44	10.40	0.050	0.850	32.00	3.000	109.16	55.87	13 903
45	12.00	0.090	1.150	36.00	1.400	44.26	17.44	6 361
46	11.20	0.150	0.750	28.00	1.800	54.61	24.02	9 242
47	9.60	0.110	1.250	20.00	2.600	79.86	46.30	12 584

序号	$F P θ - L$ /kN			$F a v θ - L$ /kN			$S E A θ - M$ /（J·kg^-1）
序号	预测值	仿真值	误差	预测值	仿真值	误差	预测值	仿真值	误差
1	62.19	60.14	-3.29%	32.06	32.98	2.84%	10 884	11 037	1.41%
2	109.16	113.03	3.55%	55.87	57.45	2.81%	13 902	15 148	8.96%
3	44.26	46.58	5.24%	17.44	15.84	-9.17%	6 361	5 883	-7.52%
4	54.61	57.53	5.35%	24.02	25.53	6.30%	9 242	9 712	5.08%
5	79.86	71.93	-9.93%	46.30	44.22	-4.49%	12 583	12 013	-4.53%

参数	$R 2$	RMAE	RAAE	RMSE
$F P θ - L$	0.924 3	0.132 3	0.066 9	0.078 5
$F a v θ - L$	0.972 3	0.112 6	0.044 9	0.053 6
$S E A θ - M$	0.950 1	0.175 0	0.061 4	0.082 1

项目	m/kg	$F P θ - L$ /kN	$F a v θ - L$ /kN	$S E A θ - M /$ （J·kg^-1）	$σ E θ - L M$
本体	0.584 9	73.80	41.72	13 753	0.12
优化	0.780 7	111.40	60.62	15 839	0.08
增益	33.47%	50.95%	45.30%	15.17%	33.33%

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综合指标	DAS	HS	SSS	RS
SEA_θ/（J·kg^-1）	11 677	12 949	11 869	11 788
σ_E	0.35	0.30	0.34	0.36
F_p/kN	259	280	254	253

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

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Figures/Tables 18

References 15

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胞元	t/ mm	h/ mm	l/ mm	γ	η	λ	K	φ
DAS			11	60	0.07	0.32	0.5	30
HS	1.5	9.0	9.0	30
SSS	0.9	6.5	6.8	30
RS	1.0	15	9.0	30