改性双基推进剂高应变率动态力学性能研究

发布时间：2018-01-05 21:24

本文关键词：改性双基推进剂高应变率动态力学性能研究　出处：《北京理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：炮射导弹技术、炮弹增程技术和末段修正迫击炮技术等新一代战术武器技术的发展,对固体火箭发动机的抗过载能力提出了较高要求。这些新型战术武器所搭载的固体火箭发动机在发射过程中承受高过载,其内部的固体推进剂装药在很高的轴向冲击载荷作用下,发生高应变率变形,这是造成装药结构破坏的一个重要原因。为提高装药结构在冲击载荷作用下的强度,有必要开展冲击载荷作用下固体推进剂的动态力学性能的研究。SHPB(分离式霍普金森压杆)实验是研究材料高应变率力学行为的一种有效的实验方法。本文针对某种改性双基推进剂,对传统的SHPB系统进行了改进,并应用经过改进的SHPB实验系统开展了常温高应变率压缩实验,获得了该种材料在400s-1-5000s-1应变率范围内的应力-应变曲线。此外,本文通过有限元仿真方法研究了SHPB实验中试件的应力均匀性。仿真结果表明,实验时试件内部的应力均匀性满足要求。SHPB实验结果表明,改性双基推进剂的高应变率压缩力学行为具有显著的应变率相关性。本文根据实验数据,得到了描述改性双基推进剂屈服行为的力学参数与应变率的关系式。本文最后根据SHPB实验获得的应力-应变曲线,采用最小二乘法拟合得到了高应变率朱王唐本构模型的参数,发现该模型能够较好地描述改性双基推进剂在高应变率下屈服前以及屈服点附近的力学行为。
[Abstract]:Gun launched missile technology, development of technology and the increase of shells of Terminal Correction Mortar Technology, a new generation of tactical weapons technology, puts forward higher requirements for the solid rocket motor is equipped with overload resistance. These new tactical weapons of solid rocket engine during the launch process under high overload, its internal solid propellant in the axial impact load is very high under the high strain rate deformation, which is an important cause of charge structure damage. In order to improve the charge structure under impact strength, it is necessary to carry out research on.SHPB dynamic mechanical properties of solid propellant under impact load (the split Hopkinson pressure bar) experiment is an effective experimental method to study the mechanical behavior of material under high strain rate. According to a modified double base propellant, SHPB improves the traditional system, and the application A modified SHPB test system was carried out at room temperature and high strain rate compression experiment, this kind of material in the 400s-1-5000s-1 strain rate stress-strain curve within the range obtained. In addition, through the method of finite element simulation on stress the uniformity in the SHPB experiment. The simulation results show that the test specimen the stress uniformity to meet the requirements of.SHPB. The experimental results show that the modified double base propellant at high strain rate compressive mechanical behavior with strain rate correlation. According to experimental data, the equation describing the modified double base propellant yield behavior of mechanical parameters and strain rate are obtained. Finally, according to the SHPB obtained by experimental stress strain curve, using the least squares fitting parameters of Zhu Wang Tang Bengou model of high strain rate has been found, the model can better describe the modified double base propellant yield under high strain rate before And the mechanical behavior in the vicinity of the yield point.

【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：V512

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