せん断応力を考慮したGRPの衝撃曲げ挙動 (強化プラスチック特集号)

概要

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The mechanical properties of GRP are more complicated than those of isotropic homogeneous materials because of its fibrous reinforcement. Especially, the shearing force at the interface between the layers of fiber bundle and resin must be taken into consideration when the ultimate strength is dealt with.<BR>This paper is intended to show that the shearing stress caused at the interface between the matrix and the reinforcement affects the ultimate strength of GRP beam under impact bending load, and furthermore that the variational stage of fracture caused by shearing stress or bending stress may exist.<BR>In order to clarify the phenomena described above, the measurement of the compressive force in the falling elastic bar and the flexural strain at the backface of the impact point, and the observation of the fracture aspect were carried out. Moreover, the stress wave propagation in the specimen was analyzed numerically for a short duration from the impact instant using the finite element method of Galerkin process. The factors causing fracture, especially about the shearing force at the interface, are discussed.
公益社団法人日本材料学会の論文