推进剂“脱湿”损伤研究的内聚力单元方法

内聚力单元是进行推进剂“脱湿”损伤研究的重要手段。通过分子动力学方法构建推进剂高填充比几何模型,结合周期几何和周期边界处理方法,构建推进剂细观有限元分析模型。采用内聚力单元结合PPR内聚力模型开展颗粒和基体黏接界面“脱湿”行为模拟。在单轴拉伸和纯剪试验下分析推进剂细观结构的力学响应,开展推进剂“脱湿”损伤机理研究。针对不同的体分比、应变速率以及内聚强度,开展了“脱湿”损伤影响规律分析。研究方法和研究结论可以为新一代高性能推进剂配方的研制提供有利的参考。

Cohesive element method for "dewetting" damage research of propellant

Cohesive element is an important means to investigate the "dewetting" damage of propellant. The high filling ratio geometric model of propellant was constructed by the molecular dynamics method, and the mesoscopic finite element analysis model of propellant was constructed by combining the periodic geometry and periodic boundary treatment methods. The "dewetting" behavior of the interface between the particle and the matrix was simulated by using the cohesion element and PPR cohesive zone model. The mechanical response of propellant mesoscopic structure was analyzed under the uniaxial tensile and pure shear tests, and the damage mechanism of "dewetting" of propellant was studied. According to different volume fraction ratio, strain rate and cohesive strength, the influence law of "dewetting" damage was analyzed. The research methods and conclusions can provide a useful reference for the formulation of a new generation of high-performance propellant.