界面韧性对C/SiC材料拉伸强度影响分析  

Effects of Interlayer Fracture Toughness on Tensile Strength of C/SiC Composites

作　　者：李尧 王晓晖[1] 刘宝瑞[1] 侯传涛[1] 王建民[1] 吴振强[1] LI Yao;WANG Xiaohui;LIU Baorui;HOU Chuantao;WANG Jianming;WU Zhenqiang(Science and Technology on Reliability and Environmental Engineering Laboratory Beijing Institute of Structure and Environment Engineering,Beijing 100076,China)

机构地区：[1]北京强度环境研究所可靠性与环境工程技术重点实验室,北京100076

出　　处：《强度与环境》2023年第5期19-27,共9页Structure & Environment Engineering

基　　金：国家自然科学基金项目(12002056,U20B2002)。

摘　　要：C/SiC复合材料的损伤失效行为与内部微细观组分的原位力学性能的密切相关。本文通过多尺度建模结合渐进损伤分析,研究了微观界面层断裂韧性对C/SiC宏观拉伸强度的影响。微观渐进损伤分析表明不同界面层韧性可以产生两种损伤扩展模式,显著改变纤维束横向拉伸和轴向剪切强度值;基于三维Hashin准则的细观损伤分析进一步表明会对C/SiC的宏观拉伸强度产生8.2%的影响。本文的结果可以为C/SiC复合材料失效分析及优化设计提供支撑。The damage and failure behaviors of C/SiC composites are strongly related to in-situ mechanical properties of inner micro-and meso-components.Through multi-scale modeling with progressive failure analysis,this work studied the effects of micro interlayer’s fracture toughness on the macro tensile strength of C/SiC composite.The micro-scale damage analyses demonstrate that the value of interlayer’s fracture toughness can induce two modes of damage evolution,so remarkably change the transverse tensile strength and axial shear strength.The meso-scale damage analyses based on three-dimensional Hashin failure criterion further show that the macro tensile strength of C/SiC can be affected by 8.2%.The results in this work could support the failure analysis and design optimization of C/SiC composites.

关 键 词：陶瓷基复合材料 界面层 断裂韧性 拉伸强度 

分 类 号：V415[航空宇航科学与技术—航空宇航推进理论与工程]