Design of a Small-caliber Fuze Magnetorheological Grease Safety and Arming Device and Its Delay Time Characteristic

doi:10.3969/j.issn.1000-1093.2019.09.001

Abstract

Abstract: A novel small-caliber safety and arming (S&A) device is proposed to improve the fuze performance of modern small caliber projectile within a limited space, for which the “locking” and “unlocking” properties of magnetorheological (MR) grease with/without the presence of magnetic field are used. Based on the principle of MR grease flow through an abrupt contraction-expansion under squeezed pressure, the delay time for arming the firing section was obtained. The delay time mathematical model of reflecting the factors, such as structure size and fluid elasto-viscosity characteristics, is further derived by analyzing the fluid dynamic and magnetic fields. Simulated and experimental results show that the modified local damping coefficient favors to reduce the maximum model error to 6.7%. A delay time range of 9-84 ms was successfully achieved by adjusting the physical parameters, including orifice diameter, spinning rate and particle concentration, etc. Owning to a wide temperature operation range and reliable working mechanism, the proposed MR grease S&A device is expected to have extensive application prospects in small and medium caliber fuze systems. Key

Key words: smallcaliberfuze, magnetorheologicalgrease, safetyandarming, delaytime

CLC Number:

TJ430.3⁺3

ZHENG Jiajia， KAN Junwu， HU Ming ， ZHANG Guang， WANG Jiong. Design of a Small-caliber Fuze Magnetorheological Grease Safety and Arming Device and Its Delay Time Characteristic[J]. Acta Armamentarii, 2019, 40(9): 1761-1769.

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第40卷
第9期2019 年9月兵工学报ACTA
ARMAMENTARIIVol.40No.9Sep.2019

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