无烟／有烟烟火药剂发射药动摩擦系数对比研究

摘要

Ignition under friction is one of the important reasons that lead to accidental explosion of pyrotechnic propellant.Dynamic friction coefficient is a key parameter for determining the energy obtained through friction.A new method for calculating the dynamic friction coefficient was presented.Based on the physical model of friction sensitivity tester the theoretical modeling and numerical calculations were performed.The dynamic friction coefficients of black powder and expired single-base propellant were measured based on this method and related experimental study was carried out.Meanwhile the effects of different experiment conditions on the dynamic friction coefficient of both propellants were discussed.The results show that the values of dynamic friction coefficients of both propellants are within the same range. With the increase of pressure and sliding velocity,the dynamic friction coefficients of both propellants will vary in a certain degree.The dynamic friction coefficient of black powder is greater than that of expired single-base propellant.%针对烟火药剂发射药受摩擦作用点火时会导致意外爆炸，而动摩擦系数是衡量摩擦作用获得能量的关键参数问题，基于摩擦感度测试仪物理模型，结合理论建模与计算，获得测定动摩擦系数方法，并结合实验研究获得有烟发射药黑火药与无烟发射药退役单基药两种常用烟火药剂发射药的动摩擦系数；研究不同实验条件对两动摩擦系数影响。结果表明，两种烟火药剂发射药的动摩擦系数均为同一范围值，且随压力及滑动速度的增大，两动摩擦系数范围均有一定变化，而每种实验条件的黑火药动摩擦系数均大于退役单基药动摩擦系数。