Abstract
In this paper, influence of kinking damage on the tensile strength of high-modulus type poly-p-phenylene benzobisoxazole (PBO) fiber was investigated in monofilament tests. Kinking damages was created on surface of virgin fiber by winding bundle fibers to steel rod. Diameter of steel rod was set to 5, 2.5, 1.25 and 0.65 mm. Average value of compressive strain on surface of fiber corresponding to the diameter of steel rods were -0.205, -0.419, -0.848 and -1.627%. Kinking damage density was defined to evaluate occurrence of kinking damage owing to bundle fiber was wound onto the steel rod. It was found that the tensile strength of fiber with kinking damage was well fitted the Weibull distribution function with 2 parameters. Kinking damage density increases with increasing compressive strain on surface of fiber. Tensile strength of fiber with kinking damage decreased with increasing kinking damage density.
