Dynamic Response and Energy Dissipation of Foam Aluminum Sandwich Panel Subjected to Underwater Impulsive Loading

doi:10.12382/bgxb.2024.0539

Abstract

Abstract:

The dynamic response and energy dissipation mechanism of foam aluminum sandwich panel under underwater impulsive load are analyzed to provide a scientific basis for the protection design of ships and marine engineering structures.The consistency between the test and simulated results is verified through the underwater explosion equivalent impact test and simulation.The influences of structural parameters,such as core layer mass ratio,panel thickness,foam aluminum density and impact load on the impact resistance of sandwich panels are quantified.Multi-objective optimization of sandwich panel structure is carried out using neural network and genetic algorithm.The results show that the foam aluminum sandwich panels subjected to underwater impact loading exhibit the deformation patterns such as local collapse and boundary shear.When the mass of sandwich panel is constant,there exists an optimal core layer mass ratio and an optimal wet panel thickness,which increase with the increase of dimensionless impulse.As the thickness of wet panel and the density of core layer decrease,the energy absorption efficiency of the compression deformation of core layer increases.The optimized sandwich panel has significantly reduced deformation and mass.

Key words: foam aluminum sandwich panel, underwater explosion, energy dissipation, impact resistance performance, optimization design

WEI Zhenqian, RONG Jili, WEI Huiyang, LI Furong, CHEN Zichao. Dynamic Response and Energy Dissipation of Foam Aluminum Sandwich Panel Subjected to Underwater Impulsive Loading[J]. Acta Armamentarii, 2025, 46(6): 240539-.

Figures/Tables 25

Fig.1 Experimental setup

Fig.2 Foam aluminum sandwich panel

Fig.3 3D finite element model

Fig.4 Grid convergence verification

Table 1 State equation parameters of water

ρ_w/(kg·m^-3)	c_w/(m·s^-1)	s₁	Γ₀
958	1490	1.92	0.1

Table 2 Material parameters of 6160 alloy aluminum

密度/ (g·cm^-3)	杨氏模量/GPa	泊松比	A/MPa	B/MPa	c	n	m
2.7	70	0.3	76	190	0.0832	0.4	0.34

Table 3 Material parameters of STEEL 4340 and 4140

材料	杨氏模量/GPa	泊松比	密度/ (g·cm^-3)	屈服应力/MPa	硬化系数/MPa	硬化指数
STEEL 4340	205	0.29	7.85	470	470	0
STEEL 4140	205	0.29	7.85	1000	1615	0.09

Fig.5 Yield surface and flow potential in stress plane

Fig.6 Nominal stress-strain responses of three types of foam aluminums

Fig.7 Comparison of shock wave pressure-time curves

Table 4 Comparison of peak pressures

压力峰值	试验值	仿真值	理论值
p_B/MPa	57.68	54.58	51.17
p_C/MPa	36.98	34.88	29.62

Fig.8 Propagation process of shock wave (simulation)

Fig.9 Deformation process of dry panel (experiment)

Fig.10 Deformation at the center of dry panel

Fig.11 Deformation process of foam aluminum sandwich panel (section)

Fig.12 Final deformation result of sandwich panel

Table 5 Structural parameters of sandwich panel

参数	夹芯板编号
参数	1	2	3	4	5	6	7
t_w/mm	0.8	0.9	1	1.1	1.2	1.25	1.3
h_c/mm	14	12.2	10.4	8.6	6.8	5.9	5.0
η/%	49.3	42.5	36.6	30.3	23.9	20.8	17.6

Fig.13 Residual deformations and energy absorption distributions of sandwich panels with different core thicknesses

Table 6 Sltructural parameters of sandwich panel

参数	夹芯板编号
参数	8	9	10	11	12	13	14
t_w/mm	0.6	0.65	0.7	0.75	0.8	0.9	1.0
h_c/mm	12.2	12.2	12.2	12.2	12.2	12.2	12.2
t_d/mm	1.2	1.15	1.1	1.05	1.0	0.9	0.8
η/%	42.5	42.5	42.5	42.5	42.5	42.5	42.5

Fig.14 Residual deformations and energy absorption distributions of sandwich panels with different panel thicknesses

Fig.15 Residual deformations and energy absorption distributions of sandwich panels with different core densities

Fig.16 Latin hypercube sampling sampling results

Fig.17 Pareto optimal solution

Table 7 Comparison between predicted and simulated values of optimal solutions

序号	t_w/mm	h_c/mm	t_d/mm	预测结果/mm	仿真结果/mm	误差/%
1	0.76	10.65	1.07	15.17	14.82	2.37
2	0.75	6.45	1.01	17.99	17.33	3.81
3	0.69	6.1	0.91	18.99	18.58	2.20
4	0.65	6.15	0.73	20.63	20.79	0.77
5	0.55	6.15	0.49	26.06	26.78	2.69

Table 8 Comparison of optimized results and simulated values

序号	结果	t_w/mm	h_c/mm	t_d/mm	变形/ mm	质量/ g	优化百分比/%
1	采样结果	1.1	13.6	0.5	20.4	562.52
	优化结果	0.63	6	0.8	20.39	379.1	32.6
	优化结果	1.1	9.15	0.99	14.17	561.72	30.5
2	采样结果	0.4	10.5	0.7	24.01	409.84
	优化结果	0.58	6.15	0.59	24.06	335.10	18.2
	优化结果	0.65	6.1	0.94	18.7	410	22.1

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