Research Papers

A Symmetric Angle-Ply Composite Flywheel for High-Speed Energy Storage

[+] Author and Article Information
Michael A. Conteh, Emmanuel C. Nsofor

Department of Mechanical Engineering
and Energy Processes,
Southern Illinois University,
1230 Lincoln Drive,
Carbondale, IL 62901

Contributed by the Materials Division of ASME for publication in the JOURNAL OF ENGINEERING MATERIALS AND TECHNOLOGY. Manuscript received December 3, 2014; final manuscript received January 14, 2016; published online February 5, 2016. Assoc. Editor: Toshio Nakamura.

J. Eng. Mater. Technol 138(2), 021009 (Feb 05, 2016) (7 pages) Paper No: MATS-14-1239; doi: 10.1115/1.4032558 History: Received December 03, 2014; Revised January 14, 2016

This study was conducted to investigate the stress, strain, and strength ratio distributions in the composite flywheel rotor for high-energy density storage applications. Symmetric laminate design was used to avoid shear and extension–bending coupling and to minimize torsion coupling. The rotor studied consists of four anisotropic unidirectional plies. The continuity conditions of the radial stresses and displacements between plies were used to obtain a local stiffness matrix for each ply and develop the global stiffness matrix for the rotor due to the different ply orientations. The Tsai–Wu three-dimensional (3D) quadratic failure criterion in stress space was used to evaluate the strength ratio of the rings. Analysis was done for ply orientations between [±5 deg]S and [±85 deg]S. Three specific ply orientations were reported for discussion. The results show how the stress, strain, and safe rotational speed of the flywheel change as the ply orientations are varied. The circumferential stress was found to be the dominant stress. It increases as the ply angle increased in the circumferential direction while the axial stress decreased. Due to significant improvements in composite materials and technology, the results from this study will contribute to further development of the flywheel which has recently re-emerged as a promising application for energy storage.

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Grahic Jump Location
Fig. 1

Quarter section of flywheel rotor

Grahic Jump Location
Fig. 2

[±5 deg]S ply orientation

Grahic Jump Location
Fig. 3

[±45 deg]S ply orientation

Grahic Jump Location
Fig. 4

[±85 deg]S ply orientation



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