固体推进剂黏弹性泊松比分步等效细观预示方法  

A stepwise equivalent meso-prediction method for viscoelastic Poisson’s ratio of solid propellants

作　　者：吕轩 许玉荣 申志彬[2] 李晓超 LU Xuan;XU Yurong;SHEN Zhibin;LI Xiaochao(Hubei Key Laboratory of Advanced Aerospace Propulsion Technology(System Design Institute of Hubei Aerospace Technology Academy),Wuhan 430040,China;Hubei Key Laboratory of Advanced Aerospace Propulsion Technology(System Design Institute of Hubei Aerospace Technology Academy),Changsha 410073,China;63620 Unit of the Chinese People’s Liberation Army,Jiuquan 732750,China)

机构地区：[1]航天动力先进技术湖北省重点实验室(湖北航天技术研究院总体设计所),湖北武汉430040 [2]国防科技大学空天科学学院,湖南长沙410073 [3]中国人民解放军63620部队,甘肃酒泉732750

出　　处：《武汉大学学报（工学版）》2021年第2期149-157,共9页Engineering Journal of Wuhan University

摘　　要：在细观尺度上对固体推进剂的黏弹性泊松比等宏观力学性能参数进行可靠预示可加速高力学性能固体推进剂的研制进程,具有重要的军事价值和可观的经济效益。根据某四组元端羟基聚丁二烯(hydroxyl terminated polybutadiene,HTPB)推进剂的组分配比特点,提出一种分步等效的推进剂力学性能细观预示方法,基于改进的随机投放算法,将不同尺寸类型的填充颗粒分开建模,生成反映该推进剂细观结构的分步等效代表性体积单元(representative volume element,RVE)模型,同时利用两点概率函数检验了RVE模型的各向同性和均匀性,通过构建含小尺寸颗粒有限元预示模型获取等效基体的黏弹性参数,通过构建含大尺寸颗粒有限元预示模型实现对推进剂在不同载荷情况下的泊松比预示,将预示结果与试验结果进行对比分析,验证模型和方法的可行性,所得结果和结论可支撑导弹武器装备安全性和贮存寿命的精细评估。Reliable prediction of macro-mechanical performance parameters such as the viscoelastic Poisson’s ratio of solid propellants on a meso scale can accelerate the development of solid propellants with high mechanical properties,and has important military value and considerable economic benefits.According to the composition ratio characteristics of a four-component hydroxyl terminated polybutadiene(HTPB)propellant,a step-by-step equivalent propellant mechanical properties meso-predictive method is proposed.Based on an improved random delivery algorithm,different sizes of filler particles are modeled separately,and a step-by-step equivalent representative volume element(RVE)model reflecting the meso-structure of the propellant is generated.At the same time,the two-point probability function is used to test the isotropy and uniformity of the RVE model.The viscoelastic parameters of the equivalent matrix are obtained by constructing a finite element prediction model containing small-size particles,and the Poisson’s ratio of the propellant under different loading conditions is predicted by constructing a finite element prediction model containing large-size particles.The predicted results and test results are compared and analyzed to verify the feasibilities of the model and method.The results and conclusions obtained can support the exquisite assessment of the safety and storage life of missile weapons and equipment.

关 键 词：固体推进剂 黏弹性泊松比 分步等效 细观预示 代表性体积单元模型 两点概率函数 

分 类 号：V435[航空宇航科学与技术—航空宇航推进理论与工程]