发射药颗粒间摩擦系数测定及其对装填密度的影响

为测量发射药颗粒间的摩擦系数并探究其对装填密度的影响,以表面涂有石墨的发射药颗粒为研究对象,采用传统的斜面仪来测量静摩擦系数; 对于滚动摩擦系数的测定,基于离散单元法,模拟发射药颗粒堆积过程,得到模拟堆积角与滚动摩擦系数间的线性拟合方程,再基于实验所测堆积角进行参数标定获取参数值,二次拟合结果说明该参数测定方法可行。模拟结果表明,堆积角随着滚动摩擦系数的增大而增大。通过模块装填模拟,探究摩擦系数对装填密度的影响,结果表明,随着摩擦系数的增大,模块所装发射药的颗粒数越小,装填密度越小,说明摩擦系数对模块装填密度的影响是一个不可忽略的因素。

Measurement of Friction Coefficient Between Gun PropellantParticles and Its Influence on Loading Density

In order to measure the friction coefficient(FC)between gun propellant particles and explore its influence on loading density,the gun propellant particles coated with graphite were taken as the research object. The static friction coefficient(SFC)was measured by using traditional cant instrument. To measure the rolling friction coefficient(RFC),the accumulation process of granular gun propellants was simulated based on discrete element method,and the linear fitting equation of simulation angle of repose with RFC was obtained. Based on the test angle of repose,the method of parameter calibration was used to get the parameter value. The quadric fitting result shows that the measurement method is feasible. The simulation results show that the angle of repose increases with the increase of the RFC. The influence of FC on loading density was studied by means of loading module simulation. The results show that the number of particles and the loading density in module decrease with the increase of the FC. The FC has an important influence on the loading density.