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A Scanning Tunneling Microscope Study of Optical Fiber Corrosion

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Abstract

The failure of glass in the presence of stress and a corrosive environment, a process known as static fatigue, is well documented1. The mechanism of static fatigue is based on the slow growth of cracks; both stress and a corrosive environment are necessary conditions for crack growth. However, exposure of a high strength glass fiber to a corrosive environment in the absence of stress has been shown to reduce its strength. This effect, known as zero-stress aging, is not well understood, but one proposed mechanism involves adsorption of water molecules on the surface promoting crack growth during subsequent strength testing. Another mechanism is based on corrosive reactions leading to surface roughness which can act as nuclei for cracks. An understanding of this behavior is very important because optical fibers in service are likely to encounter high relative humidities, water and other chemical species while exposed to zero or low stress conditions.

© 1990 Optical Society of America

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