Research on the Impact Resistance of Deformation-controllable Concave Honeycomb Structures

doi:10.12382/bgxb.2024.0037

Abstract

Abstract:

The concave honeycomb structure has broad application prospects in the automotive industry,aerospace,biomedical and other fields due to their unique deformation mode,excellent impact resistance and energy absorption properties,and lightweight characteristics.Based on the traditional Concave hexagonal honeycomb structure,a deformation-controllable concave honeycomb structure based on rounded corners enhancement is proposed by introducing a rounded corner design and changing the arrangement of the rounded corners,and a deformation-controllable honeycomb structure with deformation modes of Z and Y shapes is designed and prepared using metal 3D printing technology.In order to explore its impact resistance,its deformation mode and energy absorption properties are analyzed through the quasi-static compression and drop weight impact experiments and the finite element numerical simulation.The research results show that the proposed honeycomb structure achieves controllable deformation mode and has higher crushing stability,and the energy absorption performance of the structure is significantly improved through customized Z and Y deformation modes.For the same structure,the energy absorption performance gradually improves as the fillet radius increases.As the speed increases,the structural deformation mode gradually evolves into an I type collapse,the platform force generally shows an increasing trend,and the energy absorption efficiency gradually decreases.Due to the asymmetric arrangement of the rounded corners,the Z shape structure has better impact resistance than the Y shape structure in most cases.The research results can provide reference for the crashworthiness design of new structures under dynamic impact.

Key words: concave honeycomb structure, rounded corner design, 3D printing, energy absorption property, deformation mode, dynamic impact

CLC Number:

O342

MAO Guanghui, WANG Cheng, WANG Wanli, XU Wenlong. Research on the Impact Resistance of Deformation-controllable Concave Honeycomb Structures[J]. Acta Armamentarii, 2025, 46(3): 240037-.

Figures/Tables 37

Fig.1 Structural representative cells

Fig.2 Honeycomb overall structure

Table 1 Geometric parameters of the whole honeycomb structure

结构	总长L/mm	总高H/mm	壁厚t/mm	圆角半径r/mm
RH	69.20	45.00	0.60	0.00
ZH	69.20	45.00	0.60	0.60
YH	69.20	45.00	0.60	0.60

Fig.3 True stress-strain curves

Table 2 Material parameters of AlSi10Mg

参数	数值
密度ρ/(g·cm^-3)	2.62
杨氏模量E/GPa	71.15
泊松比n	0.30
屈服强度/MPa	245.39
断裂强度/MPa	426.85
断裂应变	0.034

Fig.4 Dynamic stress-strain curves

Table 3 Johnson-Cook parameters of AlSi10Mg

A/MPa	B/MPa	n	C
245.39	2246.24	0.74	0.037

Fig.5 250kN electronic universal testing machine

Table 4 Quasi-static experimental conditions

工况	蜂窝结构	r/mm	m/g	相对密度
1	RH	0.00	50.43	0.237
2	ZH	0.60	52.55	0.246
3	YH	0.60	52.42	0.246
4	ZH	0.30	51.48	0.239
5	ZH	0.72	52.96	0.250
6	ZH	0.90	54.53	0.256

Fig.6 Finite element model

Fig.7 Breaking force and calculation time for different mesh sizes of ZH structure

Fig.8 Repeated experimental deformation process of ZH structure under quasi-static condition(Left:ZH,right:ZH-R)

Fig.9 Load-displacement curves of ZH structure under quasi-static condition in repeated experiments

Fig.10 Experimental(left) and simulated(right) damage process of RH structure under quasi-static condition

Fig.11 Experimental(left) and simulated(right) damage process of ZH structure under quasi-static condition

Fig.12 Experimental(left) and simulated(right) damage process of YH structure under quasi-static condition

Fig.13 Load-displacement curves of different honeycomb structures under quasi-static condition

Fig.14 Load-displacement curves of ZH structures with different fillet radii under quasi-static condition

Table 5 Crashworthiness indicators of honeycomb structure under quasi-static condition

试件	EA/J	SEA/ (J·g^-1)	IPF/ kN	MCF/ kN	CFE
RH	115.54	2.29	6.90	4.62	0.67
ZH	153.76	2.93	8.10	6.15	0.76
YH	139.83	2.67	7.60	5.59	0.74
ZH-0.30	120.93	2.35	7.95	4.84	0.61
ZH-0.72	167.78	3.17	8.17	6.71	0.82
ZH-0.90	186.75	3.42	8.30	7.47	0.90

Fig.15 Comparison of experimental and simulated load-displacement curves of honeycomb structures under quasi-static condition

Fig.16 INSTRON CEAST 9350 test system

Table 6 Drop weight dynamic impact test conditions

工况	蜂窝结构	r/mm	加载速度/(m·s^-1)
1	RH	0	4
2	ZH	0.60	4
3	YH	0.60	4
4	ZH	0.30	4
5	ZH	0.72	4
6	ZH	0.90	4

Fig.17 Experimental(left) and simulated(right) damage process of RH structure under dynamic impact

Fig.18 Experimental(left) and simulated(right) damage process of ZH structure under dynamic impact

Fig.19 Experimental(left) and simulated(right) damage process of YH structure under dynamic impact

Fig.20 Load-displacement curves of different honeycomb structures under dynamic impact

Fig.21 Load-displacement curves of ZH structures with different fillet radii under dynamic impact

Table 7 Crashworthiness indicators of honeycomb structure under dynamic impact

试件	EA/J	SEA/(J·g^-1)	IPF/kN	MCF/kN	CFE
RH	122.22	2.43	8.85	4.89	0.55
ZH	156.99	2.98	10.66	6.28	0.59
YH	153.63	2.97	10.18	6.15	0.60
ZH-0.30	129.00	2.54	9.93	5.16	0.52
ZH-0.72	170.75	3.25	11.04	6.83	0.62
ZH-0.90	217.05	3.99	11.47	8.68	0.76

Fig.22 Comparison of experimental and simulated load-displacement curves of honeycomb structures under dynamic impact

Table 8 Deformation modes of three structures (v1=10m/s)

结构	ε=0.1	ε=0.2
RH
ZH
YH
结构	ε=0.3	ε=0.4
RH
ZH
YH

Table 9 Deformation modes of three structures (v2=25m/s)

结构	ε=0.1	ε=0.2
RH
ZH
YH
结构	ε=0.3	ε=0.4
RH
ZH
YH

Table 10 Deformation modes of three structures (v3=40m/s)

结构	ε=0.1	ε=0.2
RH
ZH
YH
结构	ε=0.3	ε=0.4
RH
ZH
YH

Fig.23 Horizontal strain distribution of each layer of RH structure at different speeds

Fig.24 Horizontal strain distribution of each layer of ZH structure at different speeds

Fig.25 Horizontal strain distribution of each layer of YH structure at different speeds

Fig.26 Load-displacement curves of three structures at different speeds

Table 11 Crashworthiness indicators of three structures at different speeds

加载速度/ (m·s^-1)	试件	SEA/ (J·g^-1)	PCF/ kN	MCF/ kN	CFE
10	RH	2.62	9.68	5.21	0.54
	ZH	3.79	12.20	7.85	0.64
	YH	3.67	12.42	7.61	0.61
25	RH	2.61	13.07	5.23	0.40
	ZH	3.78	16.43	7.87	0.48
	YH	3.74	18.40	7.80	0.42
40	RH	3.02	11.47	6.04	0.53
	ZH	3.69	16.88	7.68	0.46
	YH	3.64	16.03	7.57	0.47

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