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Chemical Kinetics Models for the Fatigue Behavior of Fused Silica Optical Fiber

Published online by Cambridge University Press:  10 February 2011

M. J. Matthewson
M. J. Matthewson*
Affiliation:
Department of Ceramic and Materials Engineering, Rutgers University, Piscataway, NJ 08854, mjhnm@fracture.rutgers.edu.
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Abstract

There have been numerous studies of the fatigue and strength behavior of fused silica optical fibers. However, no coherent model has emerged that self-consistently describes the simultaneous effects of stress, temperature and activity of the corroding species (e.g. water). A power law degradation kinetics model (relating the crack growth rate to the applied stress intensity factor, KI) is widely used although various exponential forms based on chemical rate theory have also been proposed. The dependence of fatigue on parameters such as humidity, pH and temperature, has usually been treated in an empirical manner. Sometimes it is even ignored -for example, the service environment is often assumed to be the same as the proof test environment when making lifetime predictions, thus avoiding the need for understanding the humidity dependence; this assumption is often unjustified. This paper reviews the dependence of fatigue on environmental factors and highlights some of the inconsistencies in published data. It is then attempted to present a coherent kinetics model that simultaneously accounts for stress temperature, humidity, etc. Several possible forms of the model are compared to a range of experimental data of several different types. The comparison is made using fitting techniques that account for correlation between fit parameters. It is found that a simple exponential form of the degradation kinetics model gives the best overall description of the temperature, humidity and pH effects on static and dynamic fatigue. It should be noted that the exponential form predicts shorter lifetimes than the ubiquitous power law model. Therefore, under some circumstances, the predictions of “worst case” models based on power law kinetics are unduly optimistic.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 531: Symposium DD – Reliabilty of Photonics Materials & Structures , 1998 , 143
Copyright
Copyright © Materials Research Society 1998

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