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平纹编织C/C复合材料手指密封件的多尺度建模与力学性能分析

Multi-scale modeling and mechanical performance analysis of finger seals with plain woven C/C composite.

作者信息

Song Danlong, Hua Keyi, Cheng Yu, Du Chunhua, Zhang Yanchao, Jing Yunjuan

机构信息

School of Mechanical and Precision Instrument Engineering, Xi'an University of Technology, Xi'an, 710048, China.

Shaanxi Yuanfeng Textile Technology Research Co., Ltd, Xi'an, 710038, China.

出版信息

Sci Rep. 2024 Oct 17;14(1):24382. doi: 10.1038/s41598-024-75966-1.

DOI:10.1038/s41598-024-75966-1
PMID:39420076
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11487134/
Abstract

The application of carbon fibers reinforced carbon matrix (C/C) composite can solve the local wear of metallic finger seals effectively. However, the performance of C/C composite finger seal is complex and variable, which further decreases the sealing performance and life. Therefore, a method of multi-scale modeling and mechanical performance analysis for plain woven C/C composite finger seals was conducted. The circumferential finger beams of C/C composite were modeled by multi-scale structural analysis and weaving simulation. The radial static and dynamic stiffness characteristics of finger beams were investigated. The results showed that the radial static stiffness of the finger beam with three layers was about 3 times that with single layer. The radial stiffness of circumferential finger beams presented a periodic distribution pattern with a period of 90°. The radial dynamic stiffness of C/C composite finger beams increased with the excitation displacement amplitude and rotor speed. But the magnitude and fluctuation degree of dynamic stiffness were greater than those of static stiffness. A large difference in radial stiffness will lead to local wear and hysteretic leakage. This study lays a foundation for the analysis and optimization of the hysteresis and wear characteristics of C/C composite finger seals.

摘要

碳纤维增强碳基体（C/C）复合材料的应用能够有效解决金属指形密封件的局部磨损问题。然而，C/C复合材料指形密封件的性能复杂多变，这进一步降低了其密封性能和使用寿命。因此，开展了一种针对平纹编织C/C复合材料指形密封件的多尺度建模与力学性能分析方法。通过多尺度结构分析和编织模拟对C/C复合材料的周向指梁进行建模。研究了指梁的径向静态和动态刚度特性。结果表明，三层指梁的径向静态刚度约为单层指梁的3倍。周向指梁的径向刚度呈现出周期为90°的周期性分布规律。C/C复合材料指梁的径向动态刚度随激励位移幅值和转子转速的增加而增大。但动态刚度的大小和波动程度均大于静态刚度。径向刚度的较大差异会导致局部磨损和滞后泄漏。本研究为C/C复合材料指形密封件的滞后和磨损特性分析及优化奠定了基础。

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