Mechanism of Coupling Effect of Shock Wave and Fragments on Clamped Square Plate

doi:10.12382/bgxb.2023.0732

Abstract

Abstract:

The coupling effect of shock wave and fragments on a clamped square plate is studied based on their coupling characteristics. The dispersion mechanism of prefabricated fragments propelled by explosives is investigated using a validated finite element model, and the findings are supported by experimental evidence. The deformation and failure modes of a target plate under various loads are discussed, and the damage mechanism resulting from the coupling effect of shock wave and fragment loading is elucidated. The results demonstrate that a coupling damage effect occurs in the vicinity of explosion field when the arrival interval between the two loads is less than the response time of target plate, regardless of the order in which the loads reach the plate. The primary deformation failure modes of target plate are flexural deformation and shear perforation caused by the shock wave and fragments, respectively. Moreover, theperforation of fragments under the action of shock wave is prone to cracking and hole penetration. The study also reveals that the mechanism of shock wave and fragment interaction differs from that of individual load. The strengthof target plate is reduced and its deflection is increased under the action of shock wave, leading to penetration perforation. Furthermore, the deflection induced by the shock wave delays the penetration time, extends the perforation period, and transfers more energy to the target plate. The residual deflection of target plateunder the coupling effectjs increased by 19.2% compared to the simple superposition of the shock wave and fragment loads.

Key words: shock wave, fragment, coupling effect, dynamic response

CLC Number:

O383.3

ZHOU Meng, LIANG Minzu, LIN Yuliang. Mechanism of Coupling Effect of Shock Wave and Fragments on Clamped Square Plate[J]. Acta Armamentarii, 2023, 44(S1): 99-106.

Figures/Tables 15

Fig.1 Finite element model

Table 1 Material parameters of 304 stainless steel[19]

A/MPa	B/MPa	n	C	m
310	1000	0.65	0.07	1

Table 2 Material parameters of TNT charge[20]

A/GPa	B/GPa	R₁	R₂	ω	e₀/GPa
373.8	3.75	4.15	0.9	0.35	7

Table 3 Material parameters of air[21]

ρ₀/ (kg·m^-3)	e₀/GPa	V₀	C₀、C₁、C₂、 C₃C₆	C₄、C₅
1.29	0.00025	1	0	0.4

Table 4 Simulation conditions

工况	TNT质量/g	爆距/m	载荷类型
S1	200	0.5	冲击波
S2	200	0.5	破片
S3	200	0.5	冲击波+破片

Fig.2 Time-space relationship between shock wave and fragments (Condition S3)

Fig.3 Deformations of target plate under various conditions

Fig.4 Experimental setup and result comparison

Fig.5 Comparison of residual deflections in experiment and simulation

Fig.6 Energy losses of fragments during penetration under S2 and S3 conditions

Fig.7 Process of fragment penetrating into target

Fig.8 Total energy change of target plate in the process of fragment penetration

Tab.5 Action time of fragments μs

编号	S2工况		S3工况
编号	开始时刻	结束时刻	开始时刻	结束时刻
阶段I	428	435	428	436
阶段II	462	477	462	480
阶段III	498	505	499	507

Fig.9 Total energy of target plate in three conditions

Fig.10 Deformation curve of central section of target plate

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