HTPB固体推进剂落锤撞击试验及点火响应模拟
Drop hammer impact test and ignition response simulation of HTPB composite solid propellant tablets
袁俊明 1刘家尧 2周翰鹏 3黄思凡 1刘艳 1孙虎1
作者信息
- 1. 中北大学环境与安全工程学院,太原 030051
- 2. 中北大学环境与安全工程学院,太原 030051;重庆红宇精密工业集团有限公司,重庆 402760
- 3. 中北大学环境与安全工程学院,太原 030051;山西江阳化工有限公司,太原 030041
- 折叠
摘要
HTPB复合固体推进剂在低幅值长脉冲压力作用下可能发生意外点火,进而发展成燃烧或爆轰导致严重后果.为研究HTPB复合固体推进剂药片在撞击作用下的受力状态及点火机制,建立了卡斯特落锤仪的冲击力测试系统,并获得了落锤撞击作用下推进剂药片特性落高值及其不同高度时药片的落锤冲击力载荷曲线.基于落锤撞击测试装置建模,开展推进剂药片的落锤撞击点火试验数值模拟.研究结果表明,药片在2kg落锤下的特性落高值H50 为29.5 cm,药片表面受到冲击力峰值 36.9 kN及作用时间 0.40 ms;数值模拟结果显示,药片发生点火的特性落高在28～30 cm之间,与试验结果相吻合;药片受到落锤冲击发生径向变形,且表面局部应力集中,同时HTPB粘结剂发生塑性流动及摩擦,导致药片局部点高温,直至诱发AP颗粒热分解发生点火响应;模拟计算得到了2kg落锤撞击药片点火的压力峰值470.9 MPa,点火时间约为0.30 ms.
Abstract
HTPB composite solid propellant may ignite unexpectedly under the action of low amplitude and long pulse pressure,and then develop into combustion or detonation,leading to serious consequences.In order to study the force state and ignition mechanism of HTPB composite solid propellant tablets under impact,an impact force testing system using the Caster drop hammer instrument was established,and the characteristic drop height values of propellant tablets under impact and the drop hammer impact load curves of the tablets at different heights were obtained.Based on the modeling of a drop hammer impact tester,the drop hammer impact ignition test of propellant tablets was numerically simulated.The research results indicate that the characteristic drop height H50 of the tablet under a 2 kg drop hammer is 29.5 cm,and the surface of the tablet is subjected to a peak impact force of 36.9 kN and an action time of 0.40 ms;The numerical simulation results show that the characteristic drop height of the ignition of the tablet is between 28 cm and 30 cm,which is consistent with the experimental results;Under the condition of local stress concentration on the surface of the tablets,HTPB binder generates plastic flow and friction,heating the tablets until thermally decomposed AP undergoes ignition response.Through simulation calculation,the peak pressure for ignition of a 2 kg drop hammer impact tablet was 470.9 MPa,and the ignition time was approximately 0.30 ms.
关键词
HTPB固体推进剂/低速冲击/落锤撞击/点火响应/数值模拟Key words
HTPB composite solid propellant/low speed impact/drop hammer impact/ignition response/numerical simulation引用本文复制引用
基金项目
中物院安全弹药研发中心开放基金(RMC2014B03)
中北大学地下目标毁伤技术国防重点学科实验室项目(DXMBJJ2017-08)
出版年
2024
NETL
NSTL
万方数据