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

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

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 mul...

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Bibliographic Details
Published in:Scientific reports Vol. 14; no. 1; pp. 24382 - 14
Main Authors: Song, Danlong, Hua, Keyi, Cheng, Yu, Du, Chunhua, Zhang, Yanchao, Jing, Yunjuan
Format: Journal Article
Language:English
Published: London Nature Publishing Group UK 17-10-2024
Nature Publishing Group
Nature Portfolio
Subjects:
639/166/984
639/166/988
C/C composite
Carbon
Carbon fibers
Finger seal
Humanities and Social Sciences
Multi-scale modeling
multidisciplinary
Plain woven
Science
Science (multidisciplinary)
Simulation
Sliding friction
Stiffness characteristics
Structural analysis
Yarn
Finger seal
C/C composite
Multi-scale modeling
Plain woven
Stiffness characteristics
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Summary: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.
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ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-024-75966-1