固体发动机药柱低温点火开裂失效的跨尺度分析  

Cross⁃scale Analysis of Low Temperature Ignition Cracking Failure of Solid Rocket Motor Grain

作　　者：王贵军 周涛 吴艳青[1] 侯晓 黄风雷[1] WANG Gui-jun;ZHOU Tao;WU Yan-qing;HOU Xiao;HUANG Feng-lei(State Key Laboratory of Explosion Science and Technology,Beijing Institute of Technology,Beijing 100081,China;Xi'an Aerospace Chemical Propulsion Co.,Ltd.,the Fourth Academy of CASC,Shaanxi Xi′an 710025,China;School of Aerospace Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]北京理工大学爆炸科学与技术国家重点试验室,北京100081 [2]中国航天科技集团第四研究院西安航天化学动力有限公司,陕西西安710025 [3]北京理工大学宇航学院,北京100081

出　　处：《含能材料》2024年第2期142-151,共10页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(U22B20131)。

摘　　要：为了准确预测推进剂装药在低温点火过程中是否发生开裂,提出了一种全局⁃局部单向收缩耦合的跨尺度分析方法。针对高能硝酸酯增塑聚醚(NEPE)推进剂,开展低温中应变率单轴拉伸试验,获取了推进剂的典型失效模式。结果表明,基于发展的推进剂非线性粘弹性本构模型,实现了固体发动机药柱低温点火的宏观结构分析,获取了推进剂药柱结构危险点的位置;同时建立了考虑颗粒与基体界面脱湿和颗粒断裂的细观颗粒填充模型,进一步将宏观结构分析结果作用于相应的细观代表性体积单元(RVE)上。最后,建立推进剂细观失效准则,表明在低温点火条件下药柱结构完整性满足要求。收缩跨尺度分析方法可作为预测药柱在低温点火过程中开裂行为的有效手段。To accurately predict the cracking of propellant grain during ignition at low temperatures,a cross⁃scale analysis meth⁃od coupled with global⁃local unidirectional contracting was proposed.For Nitrate Ester Plasticized Polyether(NEPE)propellant,uniaxial tensile tests at low temperature and intermediate strain rate were carried out,and the typical failure modes of the propel⁃lant were obtained.The results show that the ignition of solid rocket motor grain at low temperature can be analyzed successfully with macroscope method based on the developed nonlinear viscoelastic constitutive model,and the location of the dangerous point for propellant grain was obtained.Meanwhile,a mesoscopic particle filling model considering the particle⁃matrix interfa⁃cial debonding and particle fracture was established,and the analysis results on a macro scale were applied to the corresponding mesoscopic representative volume element(RVE).Finally,based on the established mesoscopic failure criteria of the propel⁃lant,it is shown that the structural integrity of the propellant grain meets the requirements under low⁃temperature ignition condi⁃tions.Furthermore,the proposed contracting cross⁃scale analysis method can be used as an effective method to predict the crack⁃ing behaviors of the propellant grain during ignition at low temperature.

关 键 词：硝酸酯增塑聚醚(NEPE)推进剂 低温点火 跨尺度分析 颗粒与基体界面脱湿 药柱开裂 

分 类 号：TJ55[兵器科学与技术—军事化学与烟火技术] V512[航空宇航科学与技术—航空宇航推进理论与工程]