The effects of the lamination with the discs reinforced by fibers in the radial direction, discs reinforced by fibers in the direction of the tangent to the central hole, and isotropically laminated discs on the increase of the circumferentially fiber-reinforced disc were studied. Molding methods of these discs and experimental results of the centrifugal strains were given, and the effects of the lamination were discussed. A fairly good agreement was obtained between the observation and the calculation of the strains. The effect of the lamination on the initial cracking strength was not so large.
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