BMCによるFRPシェルの弾性係数および振動特性の解析

概要

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Though glassfibers in BMC (bulk molding compound) seem to be distributed in all directions, BMC products have anisotropic characteristics in elasticity which are seemingly caused by the nonuniformity of BMC flow in production. This paper represents an analysis and a calculation method of the actual elastic modulus of a FRP (fiber reinforce plastic) shell molded in BMC. The FRP shell is simulated as a laminated flate with thin fiber-reinforced plates which are unidirectional in different directions. The laminate principle and the experience equation of Uemura and Yamawaki are helpful to analyze the elastic modulus of the laminated plate. The probability density of the glassfibers in the microphotograph is counted in every 10 degree direction. Counting a curved glassfiber for two directions and a round glassfiber for all directions, the elastic modulus can be calculated with great accuracy. Using the elastic modulus, natural frequencies and modes of the FRP shell have been calculated by the FEM (finite element method). Good approximations between calculations and experiments have been obtained from the first to the fifth natural frequencies and modes.
一般社団法人日本機械学会の論文
1990-03-25