Fiber-reinforced polymer (FRP) composite materialshave been widely used in various engineering fieldbecause of their superior specific strength, stiffnessand lower density compared with many traditionalmaterials. In general, FRP materials have directionaldependent properties with the directional dependencecoming from the strength of the reinforced fiber. FRPcan be produced which achieve good performanceunder tensile loads, while these parts are often notsufficiently ability to resist buckling or kinking incompression. In other words, the FRP is much softerand weaker in directions perpendicular to the stiff andstrong direction [1]. The weakness in compressionlimits the structural efficiency for FRP, therefore it isconsidered to be a design limiting parameter. Ingeneral, fibers are the principal load carrying memberswhile the surrounding matrix keeps them in the desiredlocation and orientation. The performance ofcompression depends on fiber misalignment,configuration of the fibers waviness, fiber types and soon. Structure design of FRP using various techniques,like hybrid [2], stitching or modified resin wereapplied [3]. In this study, a novel manner, namedfilament covering is proposed to improve thelongitudinal compressive properties of unidirectionalfiber reinforced plastic based on improving thecompressive buckling critical load of FRP bypreventing fiber buckling with a shortening of thebuckling critical wavelength.
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