AbstractDynamic and static fatigue results are presented for the first time for a new type of optical fiber, whose modified sol-gel cladding is a fenestrated (micro porous) form of silica. Unjacketed fibers have mean Weibull strengths in bending of 6.5 to 7.6 GPa with Weibull slopes in the 40 to 60 range. The strength decrease with decreasing strain rate is similar for both jacketed and unjacketed fibers. Even the unjacketed fibers tested in ambient water or in boiling water retain a majority of their mean strength, 7.6 GPa (ambient air) versus 6.5 GPa (ambient water) versus 5.5 GPa (boiling water). Exposure to boiling water for 1 hour has no measurable affect on the strength of these fibers. Exposure to boiling water for 8 hours, however, does significantly broaden the low strength end for the unjacketed fiber. The dynamic fatigue and static fatigue parameters in ambient water are substantially the same, ND = 22±2 and Ns 21±4, for the jacketed and unjacketed fibers. Possible mechanisms are discussed to explain the strength and fatigue behavior of these fibers in light of their unique structure.
Investigation on the Static Fatigue Mechanism and Effect of Specimen Thickness on the Static Fatigue Lifetime in WC–Co Cemented Carbides