Safety Analysis and Equivalent Test Method for Fuzes during Fast Cook-off

doi:10.12382/bgxb.2024.0463

Abstract

Abstract:

The thermal protection technology and equivalent testing technology are the key to improving the safety of fuzes during fast cook-off and the iterative efficiency of multiple rounds of optimization design of thermal protection.According to the one-dimensional fuze heat conduction model,the theoretical equations for the radial temperature distributions of explosive and fuze shell are constructed.An aluminum-silicon aerogel thermal protection model is established for aerial bomb fuze.The simulation study on the fast cook-off of fuze is carried out to obtain the temperature change curve of the explosive inside the fuze undergoing a 20-minute heating environment at 800℃.The critical thickness of thermal protection material is 3 mm,and the final temperature of explosive is 87.8℃ lower than its 5 s explosion temperature (280℃),which can ensure the thermal safety of fuze.Taking the fuze coated with aluminum-silicon aerogel as the verification subject,an equivalent test method for the fast cook-off of fuze is established based on simulation analysis and high-temperature flame injection test platformm,which is combined with the standard fast cook-off test method.Test results show that when comparing the temperature measurement data of fuze vulnerable points in standard tests with simulation data,the accuracy of the standard test results exceeds 91%.When comparing the measured temperature of fuze vulnerable points in equivalent tests with the measurement results of standard tests,the accuracy of the equivalent test results exceeds 95%.

Key words: fuze, fast cook-off, thermal protection, simulation analysis, equivalent test

CLC Number:

TJ430

LOU Wenzhong, KAN Wenxing, FENG Hengzhen, FAN Chenyang, LU Sining, LU Yi. Safety Analysis and Equivalent Test Method for Fuzes during Fast Cook-off[J]. Acta Armamentarii, 2025, 46(6): 240463-.

Figures/Tables 22

References 3

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材料	密度/ (kg·m^-3)	导热系数/ (W·m^-1·℃^-1)	比热容/ (J·kg^-1·℃^-1)
等效件	4900	4.5	800
引信壳体	7800	45	460
JO-9C	1700	0.327	1049.5
铝-硅气凝胶	180	0.02	528

材料	密度/ (kg·m^-3)	导热系数/ (W·m^-1·℃^-1)	比热容/ (J·kg^-1·℃^-1)
等效件	4900	4.5	800
引信壳体	7800	45	460
JO-9C	1700	0.327	1049.5
铝-硅气凝胶	180	0.02	528

铝-硅气凝胶厚度/mm	试验数据/℃	仿真数据/℃	相对误差/℃	误差百分比/%
2	294.2	319.58	25.38	8.63
4	215.7	202.86	12.84	5.95

铝-硅气凝胶厚度/mm	试验数据/℃	仿真数据/℃	相对误差/℃	误差百分比/%
2	294.2	319.58	25.38	8.63
4	215.7	202.86	12.84	5.95

火焰温度及不同厚度气凝胶	试验数据/℃	仿真数据/℃	相对误差/℃	精度/%
火焰温度	803.6	800	3.6	99.55
3mm铝-硅气凝胶	189.8	192.2	2.4	98.75
4mm铝-硅气凝胶	152.3	158.42	6.12	96.14