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为分析双折线损伤模型参数对复合固体推进剂细观损伤及宏观非线性力学性能的影响,采用分子动力学方法建立复合固体推进剂颗粒夹杂模型,根据Surface-based cohesive方法,在高氯酸铵(AP)颗粒与基体之间的界面处设置接触损伤。利用有限元方法对具有不同损伤参数的颗粒夹杂模型进行计算,并对比数值仿真结果。结果表明,损伤起始应力对复合固体推进剂抗拉强度、最大延伸率有较大的影响;界面初始刚度在一定程度内的变化,对复合固体推进剂宏观力学性能及细观损伤形貌影响较小;界面失效距离主要影响复合固体推进剂的最大延伸率。
In order to analyze the influence of the parameters of the double-broken line damage model on the meso-damage and the macro-nonlinear mechanical properties of the composite solid propellant, a complex solid propellant particle inclusion model was established by molecular dynamics method. According to the Surface-based cohesive method, (AP) particles and the matrix at the interface between the set contact damage. The inclusion model of particles with different damage parameters is calculated by finite element method and numerical simulation results are compared. The results show that the initial stress of damage has a great influence on the tensile strength and maximum elongation of the composite solid propellant. The change of the initial stiffness of the composite within a certain extent can affect the macroscopic mechanical properties and the morphology of the mesostructured composite Smaller; interface failure distance mainly affects the maximum elongation of composite solid propellants.