G030141 Evaluation of Compressive Strength Properties of High-Modulus PBO Fiber

Abstract

In this paper, compressive strength properties of PBO fibers were investigated in direct compression test. Two types of PBO fibers were used in the experiment. One is conventional type of fiber. Another is high modulus type of fiber, and its crystal orientation is higher than conventional type of the fiber. Weibull analysis was performed to describe distribution of compressive strength. It was found that the compressive strength of both PBO fibers were well fitted the Weibull distribution function with 2 parameters. Shape and scale parameters of high modulus type PBO fiber were 8.85 and 238 MPa, respectively. Compressive strength of the high modulus type of PBO fiber showed a slight size effects for both length and diameter direction. Compressive strength of the high modulus type of PBO fiber was higher than that of conventional type of PBO fiber.