Explosion Impact Protection Performance of Sandwich Structure with Box-shaped Cores

doi:10.12382/bgxb.2023.0256

Abstract

Abstract:

In order to improve the crashworthiness of corrugated plate sandwich structure under blast loading, a new type of box-shaped thin-walled structure is proposed as the core of the corrugated plate sandwich structure to improve its energy absorption capacity. The quasi-static crushing tests are performed on the unit cell of the box-shaped thin-walled structure. The energy absorption capacity of box-shaped thin-walled structure, such as energy absorption, specific energy absorption per unit mass, initial peak crushing force, mean crushing force, and crushing force efficiency, are analyzed and compared with that of the Kirigami modified trapezoidal structure. A numerical simulation model is established with finite element software, and calibrated with the experimental results. The energy absorptions and maximum deformations of the corrugated plate sandwich structures with box-shaped cores and Kirigami modified trapezoidal cores with different geometric configurations are analyzed and compared numerically. The numerical results show that the sandwich plate with box-shaped thin-walled structure as core has excellent crashworthiness, such as higher specific energy absorption, uniform and stable deformation pattern, and longer effective energy absorption stroke. These indicate the potential applications of the proposed corrugated plate sandwich structure with box-shaped cores for enhancing the energy absorption capacity under blast loading.

Key words: corrugated plate sandwich structure, thin-walled structure, crashworthiness, quasi-static compression, explosion shock wave, finite element simulation

CLC Number:

O383⁺.1

WANG Hao, XU Bin, WANG Shu, XU Yongjie, WU Hao. Explosion Impact Protection Performance of Sandwich Structure with Box-shaped Cores[J]. Acta Armamentarii, 2023, 44(12): 3687-3695.

Figures/Tables 14

Fig.1 Geometric structure of Kirigami modified trapezoidal corrugated structure (left) and box-shaped structure (right)

Table 1 Geometric parameters of Kirigami modified trapezoidal corrugated structure and box-shaped structure with different aspect ratios

结构	a/ mm	b/ mm	c/ mm	α/ (°)	β/ (°)	A_surf/ mm²	M/g
ST	18	24.5	4	125	90	696.12	1.98
LT	18	29	4	125	90	832.98	2.37
SA	10	19.25		78.3	81.35	695.87	2.17
LA	10	26.29		78.3	80.5	839.53	2.65

Fig.2 Photos of quasi-static compression test and specimen constraints

Fig.3 Quasi static compression test and numerical simulation results curve

Table 2 Energy absorption index parameters and errors of SA, ST, LA, and LT in quasi-static test and numerical simulation

结构	IPCF/kN		EA/J		L_max/mm		P_m/kN		CFE		SEA/(J·g^-1)
结构	试验值	仿真值	试验值	仿真值	试验值	仿真值	试验值	仿真值	试验值	仿真值	试验值	仿真值	误差/%
SA	8.47	7.82	43.40	43.83	7.70	7.29	5.64	6.01	0.67	0.77	20.00	20.20	0.99
ST	4.50	5.12	37.90	41.03	6.91	7.44	5.48	5.51	1.22	1.08	19.14	20.72	8.26
LA	9.52	9.19	46.03	48.75	7.57	7.56	6.08	6.45	0.64	0.70	17.37	18.40	5.91
LT	5.05	5.35	33.00	36.06	6.35	7.21	5.20	5.00	1.03	0.93	13.92	15.22	9.27

Table 3 Johnson-Cook model parameters of 316L stainless steel

A/ MPa	B/ MPa	n	m	C	$ε · 0$ / s^-1	T_r/ K	T_m/ K
301	553.7	0.596	1.3646	0.04963	1	298.15	1673.15

Table 3 Johnson-Cook model parameters of 316L stainless steel

A/ MPa	B/ MPa	n	m	C	$ε · 0$ / s^-1	T_r/ K	T_m/ K
301	553.7	0.596	1.3646	0.04963	1	298.15	1673.15

Fig.4 Force-displacement curves of LA structure under the condition of different grid sizes

Table 4 Deformation stress nephograms and experimental compression deformation processes of SA, LA, ST, and LT structural specimens, at 0, 0.25, 0.50, and 0.75 strains

Fig.5 Three-dimensional model and boundary conditions of the corrugated plate under explosive impact load

Table 5 Johnson-Cook model parameters of 4340 alloy steel

A/MPa	B/MPa	n	m	C	T_r/K	T_m/K
910	586	0.26	1.03	0.014	298	1726

Table 6 Comparison of energy absorption effects of corrugated plates with SA, LA, ST, and LT structures as core cells under dynamic explosive impact loads

结构	最大背凸/ mm	稳定背凸/ mm	中心点最大速度/(m·s^-1)	芯层质量比吸能/(J·g^-1)
SA	3.19	1.36	28.30	17.44
ST	3.53	1.49	22.37	17.36
LA	2.63	0.98	25.12	15.30
LT	3.12	1.16	21.23	14.50

Fig.6 Changing curve of displacement of the center point of bottom plate over time

Fig.7 Changing curves of plastic deformation and energy absorption of core layer over time

Table 7 Stress nephograms of corrugated plates with SA, LA, ST, and LT structures as core cells under dynamic explosive impact load at 0.1ms, 0.2ms, 0.4ms, and 0.8ms

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