Research on Dynamic Response and Damage Characteristics of Multi-cabin Structure under the Impact of Underwater Explosion

doi:10.12382/bgxb.2023.0276

Abstract

Abstract:

The underwater blast tests of multi-cabin structures are conducted to investigate the effects of underwater blast load intensity and blast distance on the damage characteristics of multi-cabin structures under near-surface conditions. The numerical simulation method of S-ALE structured fluid-structure coupling is used to analyze the transfer distribution of flow field pressure load, and the dynamic response and damage characteristics of structures during the near-surface blast. The damage mechanism of underwater blast lioad against multi-cabin structures is claritied based on the numerical simulations of different blast intensities and distances, and the proportion of work done by shock wave and bubble load during the change of blast distance is obtained. The dynamic response characteristics and damage modes of multi-cabin structures under blast load are summarized. The result show that the multi-cabin structure produces the coupled damage forms, such as shear breach, tearing, depression plastic deformation, crush buckling, etc. The damage discontinuity and nonlinear deformation of the structure damage cause the asymmetric expansion motion of explosion bubble, resulting in the pressure distribution in the compartment showing shock wave characteristics and quasi-static characteristics; the shock wave and bubble load together cause the local damage and overall response of multi-cabin structure, and the bubble load induces the structural kinetic energy growth of about 50% or more.

Key words: underwater explosion, multi-cabin structure, dynamic response, damage mode, numerical simulation

CLC Number:

TJ410

CHENG Lele, HUANG Fenglei, WU Haijun, TIAN Sichen, CHEN Wenge. Research on Dynamic Response and Damage Characteristics of Multi-cabin Structure under the Impact of Underwater Explosion[J]. Acta Armamentarii, 2023, 44(12): 3562-3579.

Figures/Tables 46

Fig.1 Schematic diagram of multi-cabin structure

Fig.2 Schematic diagram of multi-cabin structure

Fig.3 Underwater explosion test arrangement diagram

Fig.4 Side view of test arrangement

Fig.5 Quasi-static tensile test of Q345E steel and its true stress-strain curve

Table 1 Underwater explosion test conditions

工况	试验模型	炸药材料	炸药重量/g	爆距/mm
1	多舱室结构	GUHL	360	270
2	多舱室结构	GUHL	720	270

Fig.6 Finite element model for numerical simulation

Table 2 Equation of state of water

ρ/(g·cm^-3)	D/(m·s^-1)	S₁	S₂	S₃	γ₀	α
1.025	1480	2.56	-1.986	0.2268	0.4934	0

Table 3 Equation of state of air

ρ/(g·cm^-3)	c₀	c₁	c₂	c₃	c₄	c₅	c₆	γ	E₀/MPa
1.292×10^-3	0	0	0	0	0.4	0.4	0	1.4	0.25

Table 4 Equation of state for GUHL explosive

ρ/ (g·cm^-3)	D/ (m·s^-1)	p_CJ / GPa	A/ GPa	B/ GPa	R₁	R₂	ω	E₀/ MPa
1.8	6200	17.3	804.543	12.678	5.442	1.416	0.125	9.5

Table 5 Material parameters of Q345E steel

ρ/(g·cm^-3)	E/GPa	v	σ_y/MPa	E_t/MPa	ε_f
7.85	207	0.3	415.6	1547	0.2

Fig.7 Schematic diagram of finite element model meshing

Fig.8 Shock wave pressure curve for Case 1

Fig.9 Convergence analysis of numerical simulation

Fig.10 Case 1 test results for multi-cabin structure

Fig.11 Local damage to transverse bulkheads and decks

Fig.12 Comparison of outer plate deformations in Case 1

Fig.13 Damage comparison of multi-cabin structure in Case 2

Fig.14 Local damage comparison of multi-cabin structures in Case 2

Fig.15 Comparison of experimental and numerically simulated results of local damage

Fig.16 Comparison of the contours of the outer panel breach and the bottom panel deformation in Case 2

Fig.17 Pressure contours of flow field at 3ms in Case 1 and Case 2

Table 6 Flow field pressure clouds in Case 1

Table 7 Pressure contours of flow field in Case 2

Fig.18 Strain on different components of multi-cabin structures

Fig.19 Velocity contoures of air surges in Case 1 and Case 2

Fig.20 Variation of bubble expansion radius with time

Fig.21 Pressure contours of multi-cabin structure profiles in Cases 1 and 2

Fig.22 Pressure-time curves of cabin

Table 8 Dynamic damage process of multi-cabin structure under underwater explosion

Fig.23 Impact effect of outer plate plug block

Fig.24 Velocity profiles of punch plug breakers

Fig.25 Displacement contours of outer plate of multi-cabin structure

Fig.26 Velocity-time curve of outer plate

Table 9 Damage comparison of each component of multi-cabin structure

Table 10 Damage and deformation datamm

部件	工况1	工况2
底板	192.3	265.0
甲板01	287.1	566.2
甲板02	176.8	332.7
甲板03	29.2	49.9
纵舱壁01	32.2	367.1
纵舱壁02	7.0	90.6
横舱壁01	238.6	408.8
横舱壁02	185.5	329.9
横舱壁03	8.7	7.6

Fig.27 Kinetic internal energies of multi-cabin structures in Cases 1 and 2

Table 11 Extended cases for numerical simulation

工况	炸药质量/g	爆距/mm
EC1	360	170、270、370、470、570、670
EC2	720

Fig.28 Damage results of multi-cabin structures at different blast distances in EC1 (right side: strain contour)

Fig.29 Damage results of multi-cabin structures at different blast distances in EC 2 (right side: strain contour)

Fig.30 Maximum deformation contour of outer plate of the structure at different blast distances in EC1 & EC2

Fig.31 Exterior plate damage range (deflection>50mm) vs. blast distance

Fig.32 Variation of damage area of outer plate with proportional distance

Fig.33 Kinetic energy-time curves of multi-cabin structure in EC2

Fig.34 Kinetic energy change of the structure

Table 12 4 damage mode of multi-cabin structures

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