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自由装填药柱固体火箭发动机在点火过程中容易出现药柱结构完整性破坏,本文围绕该问题展开研究。利用有限元方法分析了自由装填星孔装药内外压差作用下药柱应力应变,同时分析了包覆层的弹性模量及推进剂泊松比对应力应变的影响。结果表明,应力应变值随着压差的增大直线上升,另外包覆层的弹性模量及药柱的泊松比对应力应变值影响很大,包覆层弹性模量越大,药柱应力越小,药柱泊松比越大,药柱应力越小。为减小应力应变,一方面可以通过发动机结构设计以减小内外压差,另一方面可以选择较高弹性模量的包覆层和高泊松比的推进剂材料。
Free-charge grain solid rocket motor is prone to damage the integrity of grain structure during ignition, this paper studies the problem. The stress and strain of the column were analyzed by the finite element method (FEM) and the influence of the elastic modulus of the coating and the Poisson’s ratio on the stress-strain of the column was analyzed. The results show that the stress and strain increases linearly with the increase of pressure drop, and the modulus of elasticity and the Poisson’s ratio of the coating have a great influence on the stress and strain. The larger the modulus of elasticity of the coating, The smaller the stress, the larger the Poisson’s ratio of the drug column, the smaller the stress of the drug column. In order to reduce the stress and strain, on the one hand, the engine structure can be designed to reduce the pressure difference between the inside and the outside. On the other hand, a higher elastic modulus coating material and a high Poisson’s ratio propellant material can be selected.