强动载荷下单基火药力学性能的研究

Mechanical Properties of Single Base Propellant Under Strong Dynamic Load

实验模拟了单基火药与弹底的高速撞击,运用泰勒理论计算了单基火药的动态屈服应力。结果显示:单基药的动态屈服应力高于静态屈服应力。单基药的撞击速度在40 m.s-1左右时,药粒开始变形;撞击速度达到190 m.s-1以上时,药粒将被撞碎;随贮存时间的增长,单基药的力学性能变差。

The striking of single base propellant（SBP） grain on bullet bottom at high speed was simulated by experiment. The dynamic yielding stress （DYS） of SBP was calculated by using Taylor theory. The results show that the DYS is larger than the static yielding stress to SBP. The shape of SBP begins to change when striking speed of SBP is at 40 m · s^-1. When striking speed of SBP is over 190 m · s^-1 ,the grain will be broken. With the storage time prolonged,mechanical property of SBP tends to be bad.