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为了研究复合推进剂基体的大应变粘弹性和界面的非线性脱粘,将Mori-Tanaka法和有限元数值求解相结合,提出了一种Mori-Tanaka有限元法。同时,为验证该方法的有效性,针对推进剂夹杂随机填充的特点,提出了一种含非线性界面脱粘的数值仿真法。最后以某推进剂配方为算例,对两种方法的计算结果了进行比较。结果表明,两种方法结果接近,从而验证了Mori-Tanaka有限元法的有效性,且该方法计算量小,极大的提高了计算效率。两种方法的提出,可以有效的用来分析界面对推进剂力学性能的影响。
In order to study the large strain viscoelasticity of the composite propellant matrix and the nonlinear debonding of the interface, a Mori-Tanaka finite element method is proposed by combining the Mori-Tanaka method with the numerical solution of the finite element method. At the same time, in order to verify the effectiveness of the method, a numerical simulation method of nonlinear interface debonding is proposed in view of the random filling of propellants. Finally, a propellant formulation is taken as an example to compare the calculated results of the two methods. The results show that the results of the two methods are close to verify the validity of the Mori-Tanaka finite element method, and the computational load is small, which greatly improves the computational efficiency. The proposed two methods can be effectively used to analyze the impact of interface on the mechanical properties of propellants.