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为准确模拟固含量不同时复合固体推进剂细观损伤产生、演化、聚合至宏观裂纹形成的过程,及该过程对复合固体推进剂非线性力学性能的影响,采用分子动力学方法建立了复合固体推进剂颗粒夹杂模型,根据Surface-based cohesive方法,在AP颗粒与基体之间的界面处设置接触损伤。利用有限元法,对含损伤颗粒夹杂模型进行计算,通过对比数值仿真结果,研究了固含量及界面损伤对复合固体推进剂细观损伤形貌及宏观力学性能的影响。结果表明,当固含量较低时,颗粒与基体之间界面损伤的聚合往往发生在少部分颗粒之间,随固含量增大,参与界面损伤聚合的颗粒逐渐增多,形成的宏观裂纹越来越明显;颗粒与基体之间的界面损伤,对复合固体推进剂非线性力学性能影响较大,不可忽略。
In order to accurately simulate the process of formation, evolution, polymerization and macrocracking of mesogenic composite propellants with different solid contents, and the influence of the process on the nonlinear mechanical properties of composite solid propellants, a complex solid propellant Propellant Particle Inclusion Model According to the Surface-based cohesive method, contact damage is set at the interface between the AP particles and the matrix. The inclusions model with damage particles was calculated by finite element method. The effects of solid content and interface damage on the meso-damage morphology and macroscopic mechanical properties of the composite solid propellant were studied by comparing numerical simulation results. The results show that when the solid content is low, the interfacial damage between the particles and the matrix tends to occur between a few of the particles. With the increase of the solid content, the particles participating in the interfacial damage polymerization gradually increase, and the macro cracks formed more and more Obviously, the interfacial damage between the particles and the matrix has a great influence on the nonlinear mechanical properties of the composite solid propellant and can not be neglected.