前言固体火箭发动机工作后,装药则受到轴向、周向和径向三向压应力的作用,这样就使得装药发生变形。在自由装填的情况下,这种变形就更严重。很显然,若装药的弹性模量越小,其变形就越严重,当弹性模量小到一定程度时,由于装药出口横截面面积的增大,就可能导致发动机爆炸。因此为了保证发动机稳定工作。装药所必须的最小弹性模量称之为临界弹性模量。为了从理论上解决这一问题,本文根据一般力学原理导出了 Introduction Solid rocket motor work, the charge is subject to axial, circumferential and radial three-dimensional compressive stress, thus making the deformation of the charge. In the case of free loading, this deformation is even more serious. Obviously, the smaller the elastic modulus of the charge, the more severe its deformation. When the elastic modulus is small, the explosion of the engine may occur due to the increase of the cross-sectional area of ​​the charge outlet. Therefore, in order to ensure the stable operation of the engine. The minimum elastic modulus necessary for charging is called the critical elastic modulus. In order to solve this problem theoretically, this article is derived from the general mechanics