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为了弄清包覆火药降低温度系数，提高初速的机理，该文用中止实验的方法研究了包覆火药的破孔过程，给出了破孔率及破孔率温度系数的定义，讨论了破孔率与温度、压力以及装填密度的关系，分析了破孔率温度系数与弹道温度系数的一致性。这对建立包覆火药装药的内弹道模型和包覆火药的质量检测标准以及预估包覆火药装药的弹道温度系数都具有重要意义。
In order to find out the mechanism of reducing the temperature coefficient and increasing the muzzle velocity of coated gunpowder, this paper studies the hole breaking process of coated gunpowder with the method of suspension experiment, and gives the definition of the rupture rate and the temperature coefficient of rupture rate. The relationship between porosity and temperature, pressure and packing density was analyzed. The consistency between the temperature coefficient of the hole breaking rate and the temperature coefficient of the trajectory was analyzed. This is of great significance for establishing the internal ballistic model of coated powder charge and the quality inspection standard of coated powder powder, and predicting the ballistic temperature coefficient of coated powder charge.