Dynamic Response of Y-shaped Sandwich Plate and the Influence Factors of Anti Explosion Performance Under the Explosion Load in the Warship Cabin

doi:10.12382/bgxb.2022.0761

Abstract

Abstract:

In order to solve the problem of anti-damage protection of ships under attack by anti-ship weapons,the dynamic response process characteristics of Y-shaped sandwich panel structure under different blast distances are analyzed by means of small cabin model experiment and finite element numerical analysis. Seven deformation modes of Y-shaped sandwich panel structure are summarized. It is found that the deformation mode of the panel is related to the blast distance and the relative strength of the rigidity of the panel and its connecting core, When the explosion distance is small, the panel is prone to local bulge deformation. If the blasting distance is large, it is prone to overall dish deformation or plate lattice deformation. If the core layer is strong and the panel is weak, the panel is prone to plate lattice deformation. If the core layer is strong and the panel is weak, it is prone to overall dish deformation. If the rigidity of the blast facing panel and the V core layer is large, the overall dish deformation of the back blast face panel occurs. Three typical deformation conditions of the Y core layer under the explosion load in the cabin are summarized, namely V buckling I instability V buckling I is constant, V is constant and I is constant; The influence of the thickness of the panel on the blasting surface, the thickness of the v-core layer and the thickness of the I-core layer on the anti-explosion performance of the Y-shaped sandwich panel structure is investigated. It is found that increasing the thickness of the panel on the blasting surface and the thickness of the I-core layer can significantly reduce the deformation of the back plate, but increasing the thickness of the panel on the blasting surface will reduce the total energy absorption of the structure, while increasing the thickness of the I-core layer will basically keep the total energy absorption of the structure unchanged. Increasing the thickness of the v-core layer, the energy absorption of the v-core layer will sharply decrease, and the maximum deformation, The total energy absorption of the structure decreases.

Key words: ship structure, explosion in the cabin, Y-shaped sandwich panel, dynamic response, deformation mode, antiknock performance

CLC Number:

O347.3

YAO Menglei, HOU Hailiang, LI Dian, XIE Yue. Dynamic Response of Y-shaped Sandwich Plate and the Influence Factors of Anti Explosion Performance Under the Explosion Load in the Warship Cabin[J]. Acta Armamentarii, 2024, 45(3): 837-854.

Figures/Tables 36

Fig.1 In cabin explosion test device and test site

Fig.2 Schematic diagram of cell structure of Y-shaped sandwich plate and core layer

Table 1 Test conditions

实验工况序号	构形	t_d/mm	t_u/mm	t_y/mm	W/g	爆距/mm
1	A-1	2	2	1	110	100
2	A-1	2	2	1	110	200
3	A-2	3	1	1	110	100
4	B-2	3	1	1	110	100
5	B-1	2	2	1	110	200

Fig.3 Manufacturing process of Y-shaped sandwich plate

Fig.4 Dimension diagram of tensile test piece

Fig.5 Stress strain curve of base metal specimen and weld

Table 2 Main mechanical property parameters of steel plate

板厚/ mm	杨氏模量/ GPa	泊松比	屈服强度/ MPa	断裂强度/ MPa	密度/ (kg·m^-3)
1	200	0.3	185	300	7 850
2、3	200	0.3	300	375	7 850

Fig.6 Deformation results of Y-shaped sandwich plate in explosion test under various working conditions

Fig.7 Deformation profile of middle section of Y-shaped sandwich plate in explosion test under various working conditions

Fig.8 Boundary condition verification model and pressure measurement point layout

Table 3 Comparison of simulation value and experience value of initial explosion shock wave in Euler domain

测点编号	冲击波超压峰值仿真值/MPa	冲击波超压峰值经验公式计算值/MPa	误差值/%
P₁	5.33	4.77	11.7
P₂	11.00	9.73	11.9
P₃	2.76	3.07	-10.1

Table 4 Material parameters in simulation

参数	ρ/(kg·m^-3)	E/GPa	ν	σ₀/MPa	E_h/MPa	F_s
数值	7850	210	0.3	300	252	0.28

Fig.9 Schematic diagram of numerical model of weld area

Fig.10 Profile deformation curve of the face plate of the front and back blast surface of numerical simulation and test

Fig.11 Comparison of deformation and failure of Y-shaped sandwich plate structure test (left) and numerical simulation (right)

Fig.12 Change of impact dynamic pressure in the cabin under 50mm blasting distance

Fig.13 Change of impact dynamic pressure in cabin under 320mm blasting distance

Fig.14 Change of impact dynamic pressure in cabin under 550mm blasting distance

Fig.15 Dynamic response process of Y-shaped sandwich plate with explosive distance of 50mm

Fig.16 Dynamic response process of Y-shaped sandwich plate with explosive distance of 320mm

Fig.17 Dynamic response process of 550mm Y-shaped sandwich plate

Fig.18 Displacement-time history curve of the center point of the front and back explosion face of Y-shaped sandwich panel under the action of explosion load in the cabin

Fig.19 Deflection and deformation of Y-shaped sandwich plate under various typical working conditions

Table 5 Working table

工况编号	迎爆面板厚度 t_d/mm	V形芯层厚度 t_v/mm	I形芯层厚度 t_i/mm	背爆面板厚度 t_u/mm	背板最大变形/ mm	吸能/ J
1	2	0.5	1	2	10.7	2810
2	1	0.5	1	2	17.7	4140
3	3	0.5	1	2	5.7	2040
4	4	0.5	1	2	4.4	1580
5	2	1.0	1	2	13.1	2130
6	2	1.5	1	2	11.7	1930
7	2	2.0	1	2	11.3	1820
8	2	2.5	1	2	10.4	1670
9	2	0.5	0.5	2	13.4	2820
10	2	0.5	1.5	2	9.81	2718
11	2	0.5	2.0	2	9.37	2712
12	2	0.5	2.5	2	9.00	2711

Fig.20 Relationship curve between panel thickness of blast facing surface and maximum deformation of back plate

Fig.21 Deformation cloud diagram of half section of Y-shaped sandwich plate under different panel thickness of blast facing surface

Fig.22 Relationship curve between panel thickness and structural energy absorption of blast facing surface

Fig.23 Energy absorption ratio of each part of the structure under different panel thickness of the blast facing surface

Fig.24 Relationship curve between thickness of V-shaped core layer and maximum deformation of back plate

Fig.25 Half section deformation cloud diagram of Y-shaped sandwich plate under different V-shaped core thickness

Fig.26 Relationship curve between V-shaped core layer thickness and structural energy absorption

Fig.27 Energy absorption ratio of each part of structure with different V-shaped core thickness

Fig.28 Relationship curve between thickness of I-shaped core layer and maximum deformation of back plate

Fig.29 Half section deformation cloud diagram of Y-shaped sandwich plate under different thickness of I-shaped core layer

Fig.30 Relationship curve between I-shaped core layer thickness and structural energy absorption

Fig.31 Energy absorption ratio of each part of structure with different I-shaped core layer thickness

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