航空学报2025，Vol.46Issue(7)：308-316,9.DOI:10.7527/S1000-6893.2024.30878
平纹碳/碳复合材料指尖密封径向刚度特性多尺度研究
Multi-scale study of radial stiffness characteristics of plain C/C composite finger seals
摘要
Abstract
Carbon fiber reinforced carbon matrix(C/C)composite have unique excellent characteristics such as self-lubrication and wear resistance,making them well-suited to the technical requirements of dynamic seals and their cor-responding application environments.These characteristics can significantly improve the service life of finger seals.However,the anisotropy performance,heterogeneous micro-structure and the complex curve lead to the complex me-chanical characteristics of C/C composite finger beams,which further affects the sealing performance and service life of finger seals.Therefore,a multi-scale finite element model of the C/C composite finger seals was firstly constructed by analyzing the multi-scale structures and performance of the plain woven C/C composite laminates.Secondly,the variation trend and circumferential distribution characteristics of radial static stiffness of C/C composite finger beams with different positions and number of layers were analyzed deeply by the multi-scale finite element method.Finally,a radial mechanical performance test platform of the finger beam was built,and radial static stiffness of C/C composite finger beams with different angular positions was verified by experiments.The research results show that the load of circular finger beam increased linearly with the radial displacement,and its radial stiffness kept constant.The radial stiffness of the finger beam with three layers of carbon fiber fabric was about 3 times that of the finger beam with single layer.The radial stiffness of circumferential distributed finger beams presents a periodic distribution characteristic of de-creasing first and then increasing,with a period of 90°,and the minimum stiffness was about 68%of the maximum stiffness.A large difference in radial stiffness will lead to local wear and hysteretic leakage.The research provides a reference and basis for the structure optimization and sealing performance of C/C composite finger seals.关键词
指尖密封/C/C复合材料/平纹编织/多尺度建模/刚度特性Key words
finger seal/C/C composite/plain weave/multi-scale modeling/stiffness characteristic分类
航空航天引用本文复制引用
宋丹龙,王源昊,华珂伊,杜春华,张延超,荆云娟..平纹碳/碳复合材料指尖密封径向刚度特性多尺度研究[J].航空学报,2025,46(7):308-316,9.基金项目
国家自然科学基金(51805429,52075436) National Natural Science Foundation of China(51805429,52075436) （51805429,52075436）
