Stiffness degradation effects on disk-shaft connection behavior of a three-dimensionally carbon-fiber-reinforced composite rotating disk. (15th February 2020)

• Record Type: Journal Article
• Authors: Hiroshima, N.; Hatta, H.; Yoshimura, J.; Goto, K.; Kogo, Y.; Wakayama, S.
• Is Part Of: Composite structures. Volume 234(2020)
• Publication Date: 2020-02-15
• Subjects: Finite element analysis (FEA) -- Rotating disk -- Stiffness -- Three-dimensionally reinforced composite -- Vibration; Composite construction -- Periodicals; Composites -- Périodiques; 624.18
• DOI: 10.1016/j.compstruct.2019.111660
• Languages: English
• ISSNs: 0263-8223

Abstract

Abstract: High-speed rotation tests of a three-dimensionally reinforced annular disk were conducted with specimens, but were suspended at a speed below that predicted for disk fracture by high-amplitude vibrations. As described herein, the vibration source was assumed to be disk stiffness degradation. This study examined the validity of this mechanism. First, laser devices were used to measure elastic displacement at the disk periphery and to estimate global disk stiffness. Second, static ring burst tests using circular ring specimens machined from composite disks were conducted to evaluate the circumferential stiffness. Compression tests were done using rectangular parallelepiped specimens for the radial stiffness. Results show that the circumferential stiffness was 67% of the prediction by the rule of mixture. The radial stiffness was 85% of that. Locally wavy carbon fiber bundles were responsible for stiffness degradation. Stiffness degradation effects on the shaft–disk connection were specifically examined based on those results.