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为确定复合固体推进剂颗粒脱湿损伤参数,采用分子动力学方法建立了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,对复合固体推进剂的细观损伤过程进行数值仿真计算。将数值仿真得到的应力-应变曲线与试验曲线进行对比,建立颗粒脱湿损伤参数的优化目标函数,通过分步迭代计算,对颗粒脱湿损伤参数进行反演识别。结果表明:根据反演参数计算复合固体推进剂细观损伤过程,颗粒夹杂模型表现出的宏观应力-应变关系与试验结果吻合良好,说明双折线损伤模型可以近似表征复合固体推进剂的脱湿损伤。
In order to determine the parameters of dehumidification damage of composite solid propellant particles, a complex solid propellant particle inclusion model was established by using molecular dynamics method. According to the Surface-based cohesive method, at the interface between ammonium perchlorate (AP) particles and the matrix Set the contact damage, the numerical simulation of the meso-damage process of composite solid propellant. The stress-strain curve obtained by numerical simulation is compared with the experimental curve to establish the optimal objective function of the particle dehumidification damage parameters, and through step-by-step iterative calculation, the particle desorption damage parameters are identified by inversion. The results show that the macroscopic stress-strain relationship of the inclusion inclusion model is in good agreement with the experimental results based on the inversion parameters to calculate the meso-damage of the composite solid propellant. It indicates that the double-break line damage model can approximate the dehumidification damage of the composite solid propellant .