Microscopic Damage Behavior of Angle-ply CFRP Laminates with Fiber Discontinuous Plies

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Complex CFRP laminate structures manufactured using prepregs are usually accompanied with fiber discontinuities that result from the cutting of prepregs. In this study, the mechanical properties and damage behavior of angle-ply [±15]2s CFRP laminates with discontinuous plies were investigated. In the experiment, 8-plies laminates with 2, 4 and 6-plies discontinuity were loaded in tension where the microscopic cameras and X-ray radiography were used to observe the initiation and growth of the damages. It was found that the different numbers of ply-discontinuity resulted in different damage behaviors. For all laminates, the onset stress of the crack in the resin-rich region and delamination decreases with the number of discontinuous plies. Also, the onset of delamination follows the crack initiation seen at the edge of the specimen. For laminates with 2 and 4-plies discontinuity, the first damage observed was the crack in the resin rich region following an insignificant micro fiber-matrix debonding at the interface edge of the resin and fiber. The crack was then followed by the edge delamination initiated from the tips of the crack in the resin rich region as well as delamination in the adjacent continuous ply due to high interlaminar shear stress induced by the fiber discontinuity. In the laminate with 6-plies discontinuity, the fiber splitting phenomenon on the most outer plies was also observed in addition of the matrix crack and delamination. To explain the damage behaviors in each laminate, a FEM analysis was also conducted in this study. The FEM stress distribution clearly explained the relationship between each damage in the laminates.

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  • Materials System

    Materials System 37 (0), 65-72, 2020

    学校法人 金沢工業大学 材料システム研究所

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