复合固体推进剂细观力学研究进展

Research progress on mesomechanics of composite solid propellants

复合固体推进剂的宏观力学性能与其细观组分密切相关。从细观结构的实验研究、细观力学的解析分析方法、细观模型的建立以及细观因素对宏观力学性能的影响四方面,对复合固体推进剂的细观力学研究进展进行了综述,并在此基础上提出了当前研究中存在的不足和需要进一步研究的重点。分析认为,实现动态加载复杂应力条件下的细观结构观测是难点,重点在于细观尺度下复合固体推进剂结构参数和变形程度的测定,针对该问题可借鉴其他颗粒增强复合材料细观结构的测试方法,将数字图像技术应用于细观结构图像处理;考虑细观各相的协同效应和增强相的分布与结构是解析分析的难点,提出基于微观力学对颗粒增强复合材料的强度和刚度进行分析,将分析结果返回细观模型,建立统一的多尺度分析框架;在细观模型建立方面,重点在于实现RVE的高效真实重构,提出基于细观图像识别与Abaqus/Python二次开发建立复合固体推进剂的细观结构模型;在数值模拟方面,应重点研究构建率相关界面损伤本构,实现复杂加载条件下的全域损伤分析。

The macroscopic mechanical properties of composite solid propellants are closely related to their mesoscopic components.This paper summarizes and analyzes the current research progress of the composite solid propellant in four aspects:the experimental study of mesostructure,the analytical analysis method of mesomechanics,the establishment of mesomodel and the influence of meso factors on macro mechanical properties.On this basis,it puts forward the shortcomings in the current research deficiencies and the key points that is need for further research.The analysis believes that it is difficult to realize the mesostructure observation under dynamic loading and complex stress conditions.The focus is on the measurement of the structural parameters and deformation degree of the composite solid propellant at the mesoscale.For this problem,we can refer to the meso-structure test methods of other particle reinforced composite materials,and applying digital image technology to meso-structured image processing.Considering the synergistic effect of meso-phases and the distribution and structure of reinforced phases were difficult points in analytical analysis.It is proposed to analyze the strength and stiffness of particle reinforced composites based on micromechanics,and return the analysis results to the meso modelto establish a unified multi-scale analysis framework.In terms of meso model establishment,the focus is on achieving efficient and true reconstruction of RVE.It is proposed to establish mesostructure model of composite solid propellant based on mesoscopic image recognition and Abaqus/Python secondary development.In terms of numerical simulation,the rate-dependent interface damage constitutive should be constructed,and achieve full-scale damage analysis under complex loading conditions.