Static Fatigue Of Optical Fibers In Bending II: Effect Of Humidity And Proof Stress On Fatigue Lifetimes

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Abstract
The goal of this work is to determine an allowable bending strain (bend radius) for optical fiber cable which is to be held in bending for long periods of time. The particular interest is in military and aerospace applications. In these applications it is desirable to use space efficiently and to route cable with as tight bending radii as possible. However, reliability cannot be compromised. In determining the lifetime of fiber it has been shown that the fiber must be tested under conditions that resemble those of actual use as closely as possible. For this reason static fatigue measurements are made in bending, and not in tension. In order to correlate static fatigue data with strength we have found that the strength must also be measured in bending. Most importantly for making reliable predictions the measurements must include long term tests; extrapolations from short term data are not reliable.

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