Dynamic Response of Directional Blast Relief Container Structure for Civil Aircraft under Internal Explosive Loading

doi:10.12382/bgxb.2023.0327

Abstract

Abstract:

The dynamic response of the directional blast relief container structure for civil aircraft under different TNT equivalent internal explosive impact is studied. A directional blast relief container for civil aircraft is designed to remove the explosive hazards in civil aircraft. Through the explosion test, the reliability of the blast relief container is verified, and the explosive critical inclusive equivalent of blast relief container is determined to be 42g. The dynamic response of blast relief container under different equivalent internal explosive loads is numerically simulated, and the motion process of a stopper and the mechanism of action of internal explosive load on the blast relief container are analyzed. The results show that the shear pin is shearing broke under the action of the explosion shock wave, and the stopper vibrates in shearing process; after shear pin is sheared, the stopper continuously accelerates, and about 7.5MPa quasi-static pressure is finally generated in the container. The stopper flys out at a uniform speed after it breaks through the fuselage bulkhead. The container relieves pressure, and a pressure gradient of about 0.38~0.85MPa is formed inward from the explosion vent. The TNT equivalent has a significant effect on the stopper flight speed. The flight speed of stopper increases and the rate of increase decreases with the increase in TNT equivalent. The study provides support for the design and application of explosion-proof containers for civil aircrafts.

Key words: civil aircraft, directional blast relief, internal explosive loading, container dynamic response, finite element simulation

CLC Number:

TJ301

ZUO Mingshuo, XU Yuxin, LI Yongpeng, LI Xudong, GUO Delong, YANG Xiang. Dynamic Response of Directional Blast Relief Container Structure for Civil Aircraft under Internal Explosive Loading[J]. Acta Armamentarii, 2024, 45(7): 2383-2392.

Figures/Tables 15

Fig.1 Structure of directional blast relief container for civil aircraft

Fig.2 Test overall arrangement

Fig.3 Measurement principle of stopper flight speed

Table 1 Shear pin breakage and flight speed of stopper in the test

试验编号	爆炸物当量/g	剪切销断裂情况	塞块飞行速度/ (m·s^-1)	备注
1	36.1	未断		塞块未飞出
2	54.8	两端沿缺口剪断	66.4	壁板未找到
3	39.0	未断		塞块未飞出
4	44.2	两端沿缺口剪断	48.2	无
5	42.0	未断		塞块未飞出
6	44.0	两端沿缺口剪断	42.5	无
7	42.2	两端沿缺口剪断	36.3	无
8	42.0	未断		再次验证42.0g 剪切销不断

Fig.4 Model of blast relief container and fuselage bulkhead

Fig.5 Mesh model of air domain and explosive

Table 2 Material parameters of blast relief container and fuselage bulkhead

参数	TI-6AL- 4V^[11]	15-5PH 钢^[12-13]	30CrMn SiA^[14]	Al2024- T3^[15-16]
ρ/(g·cm^-3)	4.440	7.80	7.83	2.780
E/GPa	110	196.507	207	72.4
ν	0.34	0.27	0.3	0.33
A/MPa	1130	1028	1500.5	325
B/MPa	250	488	1045	414
n	0.2	0.14	0.57	0.2
C	0.032	0.0137	0.019	0.015
m	1.1	0.63	1.03	1.0
$ε · 0$ /s^-1	1.0	1.0	1.0	1.0
C_p/(J·kg^-1·K)	630	248	477	1.0
T_m/K	1913	1713	1793	1220
T_r/K	293	293	293	293

Table 2 Material parameters of blast relief container and fuselage bulkhead

参数	TI-6AL- 4V^[11]	15-5PH 钢^[12-13]	30CrMn SiA^[14]	Al2024- T3^[15-16]
ρ/(g·cm^-3)	4.440	7.80	7.83	2.780
E/GPa	110	196.507	207	72.4
ν	0.34	0.27	0.3	0.33
A/MPa	1130	1028	1500.5	325
B/MPa	250	488	1045	414
n	0.2	0.14	0.57	0.2
C	0.032	0.0137	0.019	0.015
m	1.1	0.63	1.03	1.0
$ε · 0$ /s^-1	1.0	1.0	1.0	1.0
C_p/(J·kg^-1·K)	630	248	477	1.0
T_m/K	1913	1713	1793	1220
T_r/K	293	293	293	293

Table 3 Material parameters of TNT[17]

参数	数值	参数	数值
ρ/(g·cm^-3)	1.63	R₁	4.15
爆速/(m·s^-1)	6930	R₂	0.9
爆压/GP	21	ω	0.35
A/GP	373.77	E	6.0
B/GPa	3.7471	V	1

Table 4 Comparison of simulated and test results

仿真使用 TNT当量/g	剪切销是否剪断	仿真结果/g	试验结果/g	误差/%
42	是
41	是
40	否
39	否	40	42	4.76
60	是
70	是
80	是
100	是

Fig.6 Comparison of test (left) and simulation (right) damage

Fig.7 Speed variation curves of stopper with different TNT equivalents

Fig.8 Stopper speed curve and pressure change curve with TNT equivalents of 40g

Fig.9 The process of pressure distribution change

Fig.10 Variation curve of stopper flight speed with different TNT equivalents in test and simulation

Fig.11 Different polynomial fitting curves for the variation of stopper flight speed with W 3

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