Static fatigue lifetime of optical fibers in bending

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Abstract
An experimental program aimed at defining the effects of applied stress, temperature, humidity, and buffer coating on the static fatigue behavior of optical fibers in bending configurations is in progress. Data are presented below which demonstrate that the static fatigue behavior of fiber is strongly dependent on the polymeric buffer coating. Furthermore, the effect of humidity is readily evident by the comparison of times to failure at 30% RH and in water immersion. The ultimate objective of this research is to determine an allowable bend radius for fiber optic cable which is based on measurements of both static fatigue and strength in bending and which will assure reliable performance of the fiber over the design lifetime.