含能材料2026，Vol.34Issue(1)：1-15,15.DOI:10.11943/CJEM2025244
冲塞载荷下浇注炸药局域化变形流动-点火响应模拟
Simulation on Localized Deformation Flow and Ignition Response of Cast Explosives under Spigot Loading
摘要
Abstract
Aiming at the unclear issues of charge deformation and ignition mechanisms in the spigot safety evaluation tests of cast explosives,a viscoelastic-viscoplastic deformation and multi-hotspot competitive ignition model for cast PBXs was developed.This model considers multiple hotspot mechanisms,including microcrack friction,microvoid collapse,and localized viscous shear flow heating.Simulations of macro-mesoscopic rheological-ignition response under spigot were conducted,obtaining the pressure,shear flow,and ignition response characteristics of explosive charges under different drop heights,spigot lengths,and spigot shapes.The results indicate that the ignition response process of the charge under spigot is driven by both pressure and shear strain rate.When these two factors overlap at high levels,the resulting localized viscous shear flow becomes the dominant hotspot mechanism.For the same spigot diameter,a larger aspect-ratio spigot induces higher pressure and shear flow in the charge above the spigot,coupled with a longer spigot action time and higher impulse,leading to an easier ignition with a re-duced critical ignition height.Compared to a flat-head spigot,an oval-head spigot significantly reduces the critical ignition height of the charge.These findings provide technical support for interpreting the ignition response and mesoscopic mechanisms of cast explosives under low-speed long-pulse penetrating mechanical stimulation,as well as for constructing safety evaluation and numerical characterization methods for projectile drop with foreign object penetration.关键词
冲塞试验/浇注炸药/宏细观模型/局域化流动-点火/数值模拟Key words
Spigot experiment/cast explosive/macro-mesoscopic model/localized flow-ignition/numerical simulation分类
军事科技引用本文复制引用
盛星宇,杨昆,路一鸣,吴艳青,段卓平,黄风雷..冲塞载荷下浇注炸药局域化变形流动-点火响应模拟[J].含能材料,2026,34(1):1-15,15.基金项目
国家自然科学基金(12202060),北京理工大学爆炸科学与安全防护全国重点实验室青年基金(QNKT25-12)National Natural Science Foundation of China(No.12202060),Youth Foundation of the National Key Labora-tory of Explosive Science and Safety Protection at Beijing Institute of Technology(No.QNKT25-12) （12202060）
