炸药与炸药间的摩擦系数研究

Research on Friction Coefficient between Explosive and Explosive

采用分离式霍普金森压剪杆对GO-924炸药在不同冲击加载条件下的摩擦系数进行研究,得到炸药与炸药界面间的摩擦系数随时间的变化曲线。结果表明,炸药与炸药之间的动摩擦系数在运动过程中增大,到达一个峰值之后迅速下降。初步分析认为,摩擦系数升高阶段是与炸药本身具备一定的粘弹性有关。炸药晶粒、孔洞、粘接剂等组分相互作用使炸药损伤,导致系数曲线迅速下降,此时曲线已不能代表界面间的摩擦系数。动摩擦系数曲线的峰值大小与冲击加载速率和炸药本身结构组分及损伤形式有关。

The friction coefficients of GO-924 explosives under different shock loading are investigated using the split Hopkinson compression-shear bars. The friction coefficient on the interface of explosive is obtained. The results show that the friction coefficient between explosives increases in the initial period,and decreases when it reaches to a peak value. The preliminary analysis suggests that the increase in friction coefficient is related to the viscoelasticity of explosive,and the curve of friction coefficient is decreased rapidly by explosive damage due to the interaction of components,including crystal grain,hole and bond,and at this moment the curve can’t represent the friction coefficient of interface. The peak value of friction coefficient curve is related to rate of shock pulse,explosive components and its damage modes.