Damage Characteristics of Underwater Explosion Shock Wave and Bubble Load on Typical Cylindrical Shell Structure

doi:10.12382/bgxb.2021.0598

Abstract

Abstract:

To investigate the damage characteristics of the near-field explosion shock wave load and bubble load on the typical cylindrical shell structure of a scaled-down torpedo, the ALE method was conducted and the effects of explosion distance and charge position on the deformation and damage characteristics of the cylindrical shell structure were explored. The validity of the numerical simulation method was verified by comparing it with the experimental results of the evolution process of the explosion bubble near the wall. The interaction between the explosion bubble and the cylindrical shell was studied under different explosion distances and charge positions, and the damage mechanism of different forms of load such the shock wave, bubble pulsation, and water jet on the cylindrical shell structure was analyzed in detail. The results showed that the damage effect of the shock wave on the cylindrical shell structure is strongly influenced by explosion distance; the increase of explosion distance sharply weakens the damage caused by the shock wave on the cylindrical shell, while the charge position of the cylindrical shell has a weaker effect on the damage of the shock wave; the damage to the cylindrical shell is significantly influenced by charge position; when the charge is arranged below the cylindrical shell, the shell generated the maximum plastic strain under the combined effects of bubble pulsation and water jet.

Key words: underwater explosion, cylindrical shell, stress and strain, explosion distance, bubble pulsation

CLC Number:

ZHANG Yifan, LIU Liangtao, WANG Jinxiang, LI Heng, TANG Kui. Damage Characteristics of Underwater Explosion Shock Wave and Bubble Load on Typical Cylindrical Shell Structure[J]. Acta Armamentarii, 2023, 44(2): 345-359.

Figures/Tables 26

Fig.1 Meshing of various parts

Fig.2 Schematic diagram of numerical simulation model

Table 1 The number of grids in each part

空气域	水域	圆柱壳	总计
71824	5045636	4508	5121968

Table 2 Material parameters of aluminum alloy

ρ_Al/(kg·m^-3)	G₀/Pa	μ	T_m/K	c_v/(J·Kg^-1·K^-1)	A/Pa	B/Pa	n	C	m	D₁	D₂	D₃	D₄	D₅
2780	2.86×10¹⁰	0.34	775	875	2.4×10⁸	4.26×10⁸	0.34	0.015	1	0.13	0.13	-1.5	0.011	0

Table 3 Material parameters of water

ρ_w/ (kg·m^-3)	c_w/ (m·s^-1)	S₁	S₂	S₃	γ₀	α	E_w/Pa
1000	1480	1.921	-0.096	0	0.35	0	2.895×10⁵

Table 4 Material parameters of air

ρ_a/(kg·m^-3)	C₀	C₁	C₂	C₃	C₄	C₅	C₆	E_a/Pa
1.29	0	0	0	0	0.4	0.4	0	2.5×10⁵

Table 5 Material parameters of TNT

A_t/Pa	B_t/Pa	R₁	R₂	ω	E_t/(J·kg^-1)
3.712×10¹¹	3.23×10⁹	4.15	0.95	0.3	3.8×10⁶

Fig.3 Comparison of experimental and numerical results of bubble shape

Table 6 Simulation conditions

工况编号	参数
工况编号	药量/g	爆炸水深/m	药包相对圆柱壳位置	圆柱壳相对药包距离/m
1	27.0	2.7	下方	0.05
2	27.0	2.7	下方	0.10
3	27.0	2.7	下方	0.15
4	27.0	2.7	下方	0.20
5	27.0	2.7	下方	0.25
6	27.0	2.7	下方	0.30

Fig.4 Interaction between the explosion bubble and the cylindrical shell under the explosion distance of 0.05m

Fig.5 Response of cylindrical shell and flow field

Fig.6 Interaction between the explosive bubbles and the cylindrical shell under different explosion distances

Fig.7 Deflections of the cylindrical shell under different explosion distances

Fig.8 Variation of the first bubble pulsation period with explosion distance

Fig.9 Pressure on the explosion face and velocity of the flow field at the observation point with time

Fig.10 Plastic strain of the cylindrical shell induced by shock wave under different explosion distances

Fig.11 Plastic strain of the cylindrical shell induced by shock wave and bubble load under different explosion distances

Fig.12 Variation of peak stress and peak deflection of the cylindrical shell induced with the explosion distance

Table 7 Calculation conditions

工况编号	参数
工况编号	药量/g	爆炸水深/ m	圆柱壳相对药包距离/m	药包相对圆柱壳位置
1	27.0	2.7	0.10	下方
2	27.0	2.7	0.10	上方
3	27.0	2.7	0.10	侧方

Fig.13 Schematic diagram of different charge positions

Fig.14 Interaction between the explosive bubble and the cylindrical shell under different charge positions

Fig.15 Variation of explosion surface deflection with charge position

Fig.16 Pressure on the explosion face and velocity of the flow field at the observation point with time

Fig.17 Plastic strain of the cylindrical shell induced by the shock wave load under different charge positions

Fig.18 Variation of stress and plastic strain of the explosion surface with charge position

Fig.19 Plastic strain of the cylindrical shell induced by shock wave and bubble load under different charge positions

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