Relaxation of press-fit interference pressure in composite flywheel assemblies

Ryan P. Emerson, Charles E. Bakis

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations


Relaxation of pressure in interference-fitted filament wound composite rings was experimentally investigated. The ring materials, shapes, and pressures were selected to be representative of typical rings for flywheel energy storage systems, where press-fitting and rotation cause long-term loadings that can lead to time-dependent deformation and stress redistribution. Two initial pressures and three interference-fitted ring pair configurations were used; carbon/epoxy on glass/epoxy, carbon/epoxy on aluminum, and aluminum on glass/epoxy. For the composite-on-composite assemblies a 3-4% pressure drop was observed, and for the assemblies with aluminum a 4-5% pressure drop was observed. Approximately steady-state pressures were realized within 500 hours after assembly of the ring pairs. The steady-state pressure losses are percentage-wise independent of the initial pressures, suggesting that a linear-viscoelastic model may apply to these materials.

Original languageEnglish (US)
Pages (from-to)1904-1915
Number of pages12
JournalInternational SAMPE Symposium and Exhibition (Proceedings)
Issue number2
StatePublished - Jan 1 1998
EventProceedings of the 1998 43rd International SAMPE Symposium and Exhibition. Part 2 (of 2) - Anaheim, CA, USA
Duration: May 31 1998Jun 4 1998

All Science Journal Classification (ASJC) codes

  • General Materials Science
  • Mechanics of Materials
  • Mechanical Engineering


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