切欠きを有するFRP積層板における応力集中の光弾性実験による一考察

概要

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This paper deals with the investigation of stress concentration in the glassfiber reinforced laminates with U type and V type notches. The materials tested in this study are three kinds of laminates constructed of plain fabrics cloth/chopped strand mat (Cloth-Mat FRP), plain fabrics cloth alone (Cloth FRP) and chopped strand mat alone (Mat FRP). The effect of the notch shape on the stress concentration factor is examined, where the notch flank angle is chosen at V type notch and the notch depth at U type notch. The stress concentration factors in the specimens subjected to tensile load are determined experimentally by using the photoelasticity method. The main results in this study are summarized as follows; 1) The values of the stress concentration factors for these laminates are lower than for the isotropic materials, and decrease according to the order of Cloth FRP, Cloth-Mat FRP and Mat FRP. 2) The stress concentration factors of the notched FRP laminates are calculated by modifying Heywoods experimental equation for isotropic material. The calculated results show a good agreement with the experimental data.
日本複合材料学会の論文