Numerical Simulation of Blast Resistance of Foam-filled Auxetic Honeycomb Sandwich Structures

doi:10.12382/bgxb.2023.0607

Abstract

Abstract:

The dynamic response of foam-filled auxetic honeycomb sandwich structure (FAHSS) under blast load and its protective performance against concrete slabs are studied. A finite element numerical model of FAHSS under blast load, which considers the effect of strain rate on the dynamic intrinsic properties of the material, is established by utilizing finite element software ANSYS/LS-DYNA. The numerical model is validated by the existing auxetic honeycomb sandwich structure (AHSS) explosion test. The damage and failure law and energy absorption characteristics of FAHSS and its influence on the stress distribution of concrete slab are analyzed based on the validated model. FAHSS is compared with AHSS and foam sandwich structure (FSS). On this basis, the effects of polyurethane foam material density, explosion proportional distance and filling material on the blast resistance performance of FAHSS are considered. The results show that the foam filling in FAHSS reduces the damage degree of auxetic honeycomb sandwich structure. With the increase in the density of polyurethane foam material, the energy absorption of foam material in FAHSS increases. With the increase in scaled distances, the damage degree of FAHSS gradually decreases, and the damage mode changes from local damage to overall damage.

Key words: auxetic honeycomb sandwich structure, polyurethane foam, blast load, protective performance, finite element analysis

CLC Number:

TU398.9

KONG Xiangqing, LI Ruonan, CHANG Yahui, FU Ying. Numerical Simulation of Blast Resistance of Foam-filled Auxetic Honeycomb Sandwich Structures[J]. Acta Armamentarii, 2024, 45(9): 3091-3104.

Figures/Tables 20

Fig.1 AHSS composite structure finite element model

Table 1 Material model parameters[4]

部件	材料	密度/ (kg·m^-3)	弹性模量/GPa	泊松比	屈服应力/MPa	失效应变	C	P	单轴抗拉强度	A₀	A₂	NOUT
钢板	G800HSS	7850	223	0.3	789	0.2	3200	5
AHSS	AA6061	2710	40.3	0.33	113	0.12
混凝土板	钢筋	7850	200	0.25	502	0.15	40.4	5
混凝土板	混凝土	2400				0.1			0	0.04	0	2

Fig.2 Test result(upper) and simulated result(below)of AHSS/ composite structure

Fig.3 Comparisonof AHSS test(upper) and simulation(below) along the middle plane deformation

Table 2 Quantitative comparison of geometric parameters

试验与模拟	H₀/ mm	H₁/ mm	H₂/ mm	H₃/ mm	L₁/ mm	L₂/ mm
试验	10.0	45.8	50.0	46.4	91.4	182.8
模拟	11.89	49.92	48.6	49.2	94.2	190.4
相对误差/%	1.9	9.0	2.8	6.0	3.1	4.0

Fig.4 Schematic diagrams of FAHSS, AHSS and FSS

Fig.5 Comparison of deformation processes of FAHSS/composite structure, AHSS/composite structure and FSS/composite structure

Fig.6 Displacement-time curves of FAHSS, AHSS and FSS

Table 3 Calculated results

结构	泡沫密度/ (kg·m^-3)	比例距离/ (m·kg^-1/3)	填充材料	总能量/kJ	上面板位移峰值/mm	背面板位移峰值/mm
AHSS		0.064		37.4	100.11	18.75
FSS	92	0.064		34.38	63.60	13.20
FAHSS	92	0.064	聚氨酯泡沫	41.23	79.65	11.95
FAHSS	92	0.064	聚氨酯泡沫	38.52	79.65	9.95
FAHSS	202	0.064	聚氨酯泡沫	37.79	72.37	9.41
FAHSS	358	0.064	聚氨酯泡沫	37.95	65.80	8.68
FAHSS	472	0.064	聚氨酯泡沫	38.11	60.56	6.78
FAHSS	92	0.064	聚氨酯泡沫	38.53	79.33	9.95
FAHSS	92	0.144	聚氨酯泡沫	16.86	19.33	6.54
FAHSS	92	0.433	聚氨酯泡沫	13.35	7.66	3.83
FAHSS	92	1.299	聚氨酯泡沫	12.12	7.02	4.29
FAHSS	92	0.064	热塑性聚氨酯泡沫	39.27	45.17	6.77

Fig.7 Comparison of stress distributions of FAHSS, AHSS and FSS

Fig.8 Stress distributions in concrete slabs in FAHSS/composite structure, AHSS/composite structure and FSS/composite structure

Fig.9 Energy-time course curves of FAHSS/composite structure, AHSS/composite structure and FSS/composite structure

Fig.10 The energy absorption of FAHSS/composite structure, AHSS/composite structure and FSS/composite structure

Fig.11 Effective Poisson’s ratio of FAHSS to AHSS

Fig.12 Displacement-time curves of FAHSS panels with different foam densities

Fig.13 Energy absorption of each component of FAHSS/composite structure with different foam densities

Fig.14 Displacement-time curves of FAHSS panels at different scale distances

Fig.15 Energy absorption of each component of FAHSS/composite structure at different scaled distances

Fig.16 Displacement-time curves of FAHSS panel with different filling materials

Fig.17 Energy absorption of each component of FAHSS/composite structure with different filling materials

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