Dynamic Response and Failure Mechanism of Pre-holed Q235 Steel Plate under Foam Projectile Impact Loading

doi:10.12382/bgxb.2023.0359

Abstract

Abstract:

A pre-holed Q235 steel plate subjected to foam projectile impact is numerically investigated to assess the structural damage caused by combined blast and fragment loading upon detonation of cased explosives. The validity of the numerical model is checked against experimental measurements. The validated model is then employed to investigate the dynamic response, deformation/failure modes and hole-edge deflection of the pre-holed plate. The physical mechanisms of tearing failure initiated around the pre-hole are revealed using the stress triaxiality and Lode parameter for describing the state of stress. The influences of hole diameter and plate thickness on the impact resistance and failure mechanism are also quantified. Results show that the presence of a pre-formed hole significantly curtails the impact resistance of the steel plate: With increase in hole diameter or decrease in plate thickness, the hole-edge deflection of the steel plate grows, while the projectile momentum causing tearing failure drops.

Key words: pre-holed plate, dynamic response, failure mechanism, stress state, numerical simulation

CLC Number:

O383.3

HAN Jiatong, WANG Xin, ZHANG Lei, LI Zhen, WANG Pengfei, ZHAO Zhenyu, LU Tianjian. Dynamic Response and Failure Mechanism of Pre-holed Q235 Steel Plate under Foam Projectile Impact Loading[J]. Acta Armamentarii, 2023, 44(12): 3654-3666.

Figures/Tables 27

Fig.1 FE simulation model

Fig.2 Quasi-static compressive true stress-true-strain curve of aluminum foam with closed cells[20]

Table 1 Material model coefficients of Q235 steel[23]

参数	数值
ρ_p/(kg·m^-3)	7800
E/GPa	200
A/MPa	235
B/MPa	275
n	0.36
C	0.022
m	1.03
$ε · 0$ /s^-1	1
T_m/K	1673
T_r/K	293
泊松比	0.3
ε_f	1

Table 1 Material model coefficients of Q235 steel[23]

参数	数值
ρ_p/(kg·m^-3)	7800
E/GPa	200
A/MPa	235
B/MPa	275
n	0.36
C	0.022
m	1.03
$ε · 0$ /s^-1	1
T_m/K	1673
T_r/K	293
泊松比	0.3
ε_f	1

Table 2 Comparison between numerical and experimental results

编号	子弹密度/ (kg·m^-3)	速度/ (m·s^-1)	单位面积动量/ (kPa·s)	孔周位移/mm
编号	子弹密度/ (kg·m^-3)	速度/ (m·s^-1)	单位面积动量/ (kPa·s)	实验结果	仿真结果	误差/ %
1	392	164	5.4	15.8	16.9	6.5
2	385	210	6.9	21.0	22.0	4.5
3	385	257	8.5	27.3	27.8	1.7
4	387	342	11.3	38.2	39.3	2.7
5	389	363	12.0	40.9	42.4	3.5
6	390	388	12.8	45.0	46.2	2.5

Fig.3 Comparison between experimentally observed and numerically predicted failure modes of pre-holed Q235 steel target plate for projectile momentum I0=12.8kPa·s

Fig.4 Comparison between experimentally and numerically predicted central cross-sectional deflections

Fig.5 Deformation process of pre-holed Q235 steel plate

Fig.6 Contact force and transmitted momentum-time curves of pre-holed Q235 steel plate

Fig.7 Hole-edge deflection-time curve of pre-holed Q235 steel plate

Fig.8 Typical stress state regimes

Fig.9 Hole-edgedeflection versus projectile momentum

Fig.10 Equivalent plastic strain contours of pre-holed plate for I0=6.63kPa·s

Fig.11 Change of stress triaxiality and Lode parameter for I0=6.63kPa·s

Fig.12 Average stress triaxialities and Lode parameters of representative elements for I0=6.63kPa·s

Fig.13 Equivalent plastic strain contours of pre-holed plate for I0=9.94kPa·s

Fig.14 Change of stress triaxiality and Lode parameter for I0=9.94kPa·s

Fig.15 Average stress triaxialities and Lode parameters of representative elements for I0=9.94kPa·s

Table 3 Key geometrical parameters of the pre-holed plates with various hole diameters

编号	D_f/ mm	L_p/ mm	L_f/ mm	h_p/L_p	h_p/ mm	d_f/ mm	d_f/L_p
1	57	180	85	0.0055	1	3.6	0.02
2						7.2	0.04
3						10.8	0.06
4						14.4	0.08
5						18	0.10

Table 4 Failure modes of pre-holed plates with various hole diameters

Fig.16 Failure modes of pre-holed plates with various hole diameters

Fig.17 Dimensionaless critical momentum versus hole diameter

Fig.18 Average stress triaxialities and Lode parameters of representative elements of pre-holed plates with various hole diameters at critical momentums

Table 5 Key geometrical parameters of pre-holed plates with various plate thicknesses

编号	D_f/ mm	L_p/ mm	L_f/ mm	d_f/L_p	d_f/ mm	h_p/ mm	h_p/L_p
1	57	180	85	0.04	7.2	0.50	0.0028
2						0.75	0.0041
3						1.00	0.0055
4						1.25	0.0069
5						1.50	0.0083

Table 6 Failure modes of pre-holed plates with various plate thicknesses

Fig.19 Failure modes of pre-holed plates with various plate thicknesses

Fig.20 Dimensionaless critical momentum versus plate thickness

Fig.21 Average stress triaxialities and Lode parameters of representative elements of pre-holed plates with various plate thicknesses at critical momentums

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