针对复合固体推进剂细观损伤的特点,在颗粒与基体之间引入了粘结界面单元,采用双线性关系模型描述其界面损伤扩展特性,并对双线性关系模型中初始线性模量、最大粘结强度和最大张开位移等参数进行了预测.结合复合固体推进剂的填充模型,对推进剂内部细观界面脱粘过程进行了有限元分析.研究表明,采用粘结界面单元可以有效模拟推进剂颗粒的界面脱粘过程,推进剂在拉伸过程中力学性能的非线性与界面脱粘有密切关系,研究结果与试验观察结果相吻合.
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