Improved performance for hoop-wound composite flywheel rotors

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Developmental work to date has shown the performance of hoop-wound composite flywheel rotors to be severely limited by composite transverse strength. This problem is addressed in a joint experimental-analytical effort aimed at improving transverse properties and assessing the impact of this improvement on flywheel performance. An improved test fixture designed to test hoop-wound cylinders in axial tension is developed. Test results show this specimen and test fixture produce more consistent data than do flat tensile bars cut from hexagonal cylinders. Initial experimental results from the improved specimen indicate that the transverse strength of Kevlar 49/epoxy composites could be improved by ... continued below

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Pages: 29

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Allred, R.E.; Foral, R.F. & Dick, W.E. January 1, 1977.

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Description

Developmental work to date has shown the performance of hoop-wound composite flywheel rotors to be severely limited by composite transverse strength. This problem is addressed in a joint experimental-analytical effort aimed at improving transverse properties and assessing the impact of this improvement on flywheel performance. An improved test fixture designed to test hoop-wound cylinders in axial tension is developed. Test results show this specimen and test fixture produce more consistent data than do flat tensile bars cut from hexagonal cylinders. Initial experimental results from the improved specimen indicate that the transverse strength of Kevlar 49/epoxy composites could be improved by 30% by copolymerizing the epoxide matrix with an elastomer. The impact of these data on flywheel performance is predicted by a computer program which identifies optimum designs for given material properties on an energy-stored-per-swept-volume basis. A substantial improvement in performance is predicted, the attained 30% strength improvement of Kevlar 49/epoxy is shown to produce a 15% increase in energy stored. The analysis also permits multiple-material designs. Hybrid designs appear to have considerable potential for increasing storage capacity compared to single-material designs.

Physical Description

Pages: 29

Notes

Dep. NTIS, PC A03/MF A01.

Source

  • Flywheel technology symposium, San Francisco, CA, USA, 5 Oct 1977

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  • Report No.: SAND-77-1024C
  • Report No.: CONF-771053-5
  • Grant Number: EY-76-C-04-0789
  • Office of Scientific & Technical Information Report Number: 5355705
  • Archival Resource Key: ark:/67531/metadc1074828

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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Creation Date

  • January 1, 1977

Added to The UNT Digital Library

  • Feb. 4, 2018, 10:51 a.m.

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  • March 29, 2018, 12:55 p.m.

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Allred, R.E.; Foral, R.F. & Dick, W.E. Improved performance for hoop-wound composite flywheel rotors, article, January 1, 1977; United States. (digital.library.unt.edu/ark:/67531/metadc1074828/: accessed December 16, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.