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为研究复合推进剂AP/基体界面脱湿机理,建立了基于粘聚力界面模型的双尺度有限元损伤分析平台。为确定界面模型的输入参数,采用点滴法和Washburm毛细管上升法,分别测得基体与AP颗粒的接触角,再经Young’s方程计算得到界面的粘附功。通过对不同体积分数下简化配方推进剂试件的拉伸试验结果与计算结果的对比显示,两者具有较好的一致性。研究表明,所建立的从实验到仿真的一整套方案为研究复合推进剂界面脱湿机理提供了一条新思路;粘附功可定量表征推进剂AP/基体界面的粘结状况;在较高体积分数下,AP颗粒间的应力集中作用更强,颗粒与基体间的脱湿作用更加明显,导致推进剂模量下降得更快。
In order to study the dehumidification mechanism of composite propellant AP / matrix interface, a two-scale finite element damage analysis platform based on cohesive interface model was established. In order to determine the input parameters of the interface model, the contact angle between the matrix and the AP particles was measured by using the drip method and the Washburm capillary ascending method, respectively, and then the adhesion work was calculated by Young’s equation. The comparison between the tensile test results and the calculated results of simplified propellant samples with different volume fraction shows that the two have good consistency. The results show that the set of experiments from simulation to simulation provides a new idea for studying the dehumidification mechanism of composite propellant. Adhesion work can quantitatively characterize the bonding condition of the propellant AP / matrix interface. In a higher volume Under the scores, the stress concentration between AP particles is stronger, and the desorption effect between particles and matrix is more obvious, which leads to the decrease of propellant modulus.