考虑细观损伤的推进剂粘弹性多尺度本构模型研究  

A Multiscale Viscoelastic Constitutive Model for Solid Propellants Considering Microscale Damage

作　　者：乌布力艾散·麦麦提图尔荪 周涛 吴艳青[1] 侯晓 周程哲 MAIMAITITUERSUN Wubuliaisan;ZHOU Tao;WU Yan-qing;HOU Xiao;ZHOU Cheng-zhe(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,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实验室,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133-141,共9页Chinese Journal of Energetic Materials

基　　金：国家自然科学基金(U22B20131)。

摘　　要：为了深入研究固体推进剂细观损伤行为及对其宏观力学性能的影响,在223~333 K温度下对硝酸酯增塑聚醚推进剂(NEPE)推进剂开展了单轴拉伸和应力松弛试验,获得了相应的应力应变曲线及松弛模量主曲线。在有限变形下开发了考虑细观损伤的非线性粘弹性本构模型,该模型通过将微空洞演化与温度、应变率、围压及循环加载损伤等因素关联实现对推进剂力学性能的多尺度分析。通过有限元软件ABAQUS对模型进行了二次开发,并基于试验数据确定了模型参数,之后将模型应用于预测推进剂在不同加载下的力学响应。结果表明,该模型能够准确预测推进剂在宽温(223~333 K)和加载速率(1~200 mm·min^(-1))下的单轴拉伸响应,并且适用于循环加载、围压试验和双轴加载试验,验证了该模型在复杂应力状态下的有效性。该模型所需参数较少且易于嵌入商用软件,可为发动机推装药结构完整性的多尺度分析提供一定的理论指导。In order to study the damage evolution and mechanical properties of solid propellants,uniaxial tensile and stress relax⁃ation tests were performed on NEPE propellant.The resulting stress⁃strain curves and relaxation master modulus curves were ob⁃tained.A nonlinear viscoelastic constitutive model considering microscopic damage was developed under finite deformation.This model enables multiscale analysis of the mechanical response of propellants by incorporating the evolution of microvoids with various factors,including temperature,strain rate,confining pressure,and cyclic stress softening.The model was then im⁃plemented into ABAQUS with the parameters determined based on experimental data.Subsequently,the model was employed to predict the mechanical response of NEPE propellant under different loading conditions.The results demonstrate that the model accurately predicts the uniaxial tensile response of propellants under wide temperature ranges(223-333 K)and loading rates(1-200 mm·min^(-1)).Moreover,the model exhibits reasonable predictability in cyclic loading,confining pressure tests,and biax⁃ial tensile tests,thereby validating its effectiveness under complex stress conditions.Notably,the model necessitates only a small set of model parameters and can be easily programmed into commercial software,providing theoretical guidance for the multi⁃scale analysis of the structural integrity of solid rocket motors.

关 键 词：固体推进剂 细观损伤 多尺度本构模型 非线性粘弹性 围压 双轴拉伸 

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]