近场动力学方法在C/C复合材料烧蚀问题中的应用  

Application of Peridynamics in Ablation of C/C Composites

作　　者：陈明伟 刘齐文[1,2] 刘立胜 CHEN Mingwei;LIU Qiwen;LIU Lisheng(Department of Mechanics,Wuhan University of Technology,Wuhan 430070,China;Hubei Key Laboratory of Theory and Application of Advanced Materials Mechanics,School of Science,Wuhan University of Technology,Wuhan 430070,China)

机构地区：[1]武汉理工大学力学系,湖北武汉430070 [2]武汉理工大学理学院新材料力学理论与应用湖北省重点实验室,湖北武汉430070

出　　处：《安全与环境工程》2019年第1期191-197,共7页Safety and Environmental Engineering

基　　金：中央高校基本科研业务费专项资金项目(2017IB018;2018IB006;2017IB017)

摘　　要：C/C复合材料是一种碳纤维增强的新型复合材料,作为抗烧蚀材料而广泛地应用于飞行器的热防护领域。在热化学烧蚀作用下,C/C复合材料通过质量损失,带走大量的热,从而阻止高温对飞行器内部结构部件的损害,保证工作人员和仪器的安全。C/C复合材料的热化学烧蚀是一个典型的非线性、不连续问题。不同于传统偏微分方程在不连续边界上的奇异性,近场动力学(PD)理论采用积分-微分方程避开了这一问题,可以在不引入其他复杂判定条件的情况下,用于描述烧蚀界面的移动问题。通过对热化学烧蚀作用下C/C复合材料质量的损失和结构边界移动过程的近场动力学数值模拟,分析了热化学烧蚀与温度场耦合作用下C/C复合材料烧蚀性能的变化规律。Carbon/carbon composite,a new composite of carbon fiber reinforced with carbon matrix,is widely applied to thermal protection of aerospace as ablative material.Due to thermo-chemical ablation,carbon/carbon composite reacts chemically with the atmosphere,which causes a loss of mass,and takes away a large amount of heat,thus preventing high temperature from damaging internal structural components,and ensuring the safety of the personnel and instruments.Thermo-chemical ablation of carbon/carbon composite is a typical,nonlinear and discontinuous problem.Different from the singularity of traditional partial differential equations on discontinuous boundaries,the peridynamics avoids this problem by using integral-differential equations,which can describe the movement of the ablation interface without introducing other complicated decision conditions.This paper conducts the peridynamics simulation of the loss of C/C composite mass and the boundary movement process of the structure with the thermo-chemical ablation,and analyzes the ablation performance of C/C composites with the coupling of thermo-chemical ablation and temperature field.

关 键 词：C/C复合材料 飞行器安全 热防护 近场动力学 热化学烧蚀 温度场 数值模拟 

分 类 号：X949[环境科学与工程—安全科学] V259[一般工业技术—材料科学与工程]