Tensile Strength Characteristics of " Perfect " Silica Fibers

Kurkjian, Charles R.; Krause, J. T.; Paek, Un-Chul

doi:10.1051/jphyscol:19829115

Cited by 31 publications

(28 citation statements)

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“…However, if it is assumed that the water at the crack tip is in equilibrium with the vapor, then the activities at the crack tip and in the vapor must be the same. We expect this to be a good approximation since the fibers are strong and any cracks are of molecular dimension, 13 which means that very little water is consumed by the growth of such small cracks. Therefore, crack growth will not be expected to significantly reduce the local concentration of water.…”

Section: Crack Growth Models For Fatiguementioning

confidence: 99%

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Humidity Dependence of the Fatigue of High‐Strength Fused Silica Optical Fibers

Armstrong

Matthewson

Kurkjian³

2000

Journal of the American Ceramic Society

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Strength and dynamic fatigue behavior of silica fibers has been measured as a function of ambient humidity. Bare and polymer-coated fibers were compared to determine the influence of the coating. The results verify earlier work that suggests the degradation reaction is approximately second order with respect to humidity. However, we verify this result using rigorous data analysis techniques and, unlike the earlier work, the result is shown to be independent of the form of the kinetic model for crack growth. Trends in the calculated fatigue parameters illustrate that a simple exponential crack growth law best describes the humidity data. No significant differences were found between coated and bare fibers, provided the coated fibers were properly equilibrated. A data analysis methodology is given for obtaining valid reaction orders independently of the crack growth law form.

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Section: Crack Growth Models For Fatiguementioning

confidence: 99%

“…Even though in this work, "pristine," high-strength silica fiber is used which does not contain well-defined cracks, 13 it is assumed that crack growth and not crack initiation controls fatigue. The power law, designated model 1 here, may be expressed…”

Section: Crack Growth Models For Fatiguementioning

confidence: 99%

Humidity Dependence of the Fatigue of High‐Strength Fused Silica Optical Fibers

Armstrong

Matthewson

Kurkjian³

2000

Journal of the American Ceramic Society

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“…Figure 3 shows that s f increases for decreasing r and it can exceed 15 GPa for r < 100 nm. This value is considerably higher than those recorded for conventional high strength materials (e.g., steel or Kevlar) and for bulk silica/optical fibers (s f~6 Gpa in air at room temperature) [7]. The increased strength observed in the silica OMNFs can be explained by a reduced possibility of having large cracks in small wires.…”

Section: Mechanical Propertiesmentioning

confidence: 77%

Optical fiber microwires and nanowires manufactured by modified flame brushing technique: properties and applications

Brambilla

Jung

Renna

2010

Front. Optoelectron. China

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“…This is not observed in experiment; the scatter in the strength of pristine fiber is extremely small. 29 While the scatter in time to failure is larger, most of it can be understood from the experimental variability in the applied stress. 30 Other possibilities that might result in apparent power law kinetics could involve the stochastic nature of the glass structure.…”

Section: Discussionmentioning

confidence: 99%

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

Matthewson

1998

MRS Proc.

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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, K I ) 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 ignoredfor 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.

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Tensile Strength Characteristics of " Perfect " Silica Fibers

Cited by 31 publications

References 0 publications

Humidity Dependence of the Fatigue of High‐Strength Fused Silica Optical Fibers

Humidity Dependence of the Fatigue of High‐Strength Fused Silica Optical Fibers

Optical fiber microwires and nanowires manufactured by modified flame brushing technique: properties and applications

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

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