G0301-1-5 Effect of UV-Irradiation on the Tensile Strength of flexural damaged PBO fiber

Abstract

In this paper, tensile strength of UV light irradiated and flexural damaged poly-p-phenylene benzobisoxazole (PBO) fiber were investigated in monofilament tests. The tensile tests of a monofilament were carried out at a gauge length of 12.5 mm and deformation rate of 0.5 mm/min. The flexural damage given to the fiber was introduced by wrapping the fiber around the wire. The diameter of the wire 1.25 mm, 0.625 mm and 0.325 mm. Irradiation time was 1 h and radiance was 8 W/m2. It was found that tensile strength of PBO fiber depended on the flexural damage in relatively small damage. However, tensile strength of PBO fiber depended on both the flexural damage and UV exposure in relatively small damage.