Journal ArticleDOI
Effect of Loading Mode and Coating on Dynamic Fatigue of Optical Fiber in Two-Point Bending
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TLDR
In this paper, the authors present dynamic fatigue results using a two-point bend apparatus that can be programmed to operate in constant velocity, constant strain rate, and constant stress rate loading modes.Abstract:
Tho-point bending is a useful method for investigating the mechanical properties of optical fiber and has several advantages when compared to the traditional tensile test. However, the strength of the fiber is usually determined at constant faceplate velocity rather than at constant strain rate as in the uniaxial tensile test, and previous work casts doubt on the comparability of fatigue results obtained using different loading modes and hence on the reliability of the bending technique. This paper presents dynamic fatigue results using a two-point bend apparatus that can be programmed to operate in constant velocity, constant strain rate, and constant stress rate loading modes. These results, obtained for both bare and polymer-coated fused silica optical fiber, show no significant differences in the calculated fatigue parameters for the three loading modes and clearly indicate the reliability of the two-point bend method at constant faceplate velocity. The results, however, show that the obtained value of the stress corrosion susceptibility parameter, n, is dependent on the quantity used to define it, i.e., stress or strain to failure, because of the nonlinear elastic behavior of silica.read more
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Journal ArticleDOI
Environmental durability of glass-fiber composites
TL;DR: In this article, the relative rates of these degradation processes are a function of the chemistry of the resin, temperature, length of time of exposure, degree of stress (whether cyclic or static), chemistry and morphology of coating of coupling agent on the glass fiber, and type of glass fiber.
Journal ArticleDOI
Acid stripping of fused silica optical fibers without strength degradation
TL;DR: In this article, it was shown that careful complete stripping has little or no effect on the strength of fiber tested in both tension and bending tests, and that the immersion time in the hot acid has no noticeable effect on strength.
Journal ArticleDOI
Humidity Dependence of the Fatigue of High‐Strength Fused Silica Optical Fibers
TL;DR: In this article, the strength and dynamic fatigue behavior of silica fibers has been measured as a function of ambient humidity and the results verify earlier work that suggests the degradation reaction is approximately second order with respect to humidity.
Journal ArticleDOI
Strength increase of silica glass fibers by surface stress relaxation: A new mechanical strengthening method
Lezzi Peter Joseph,Qiran Xiao,Minoru Tomozawa,Thierry A. Blanchet,Charles R. Kurkjian,Charles R. Kurkjian +5 more
TL;DR: In this article, a tensile stress application during the heat-treatment of a silica glass fiber was shown to increase the strength of the fiber, which is attributed to the formation of a compressive stress layer on the surface.
Journal ArticleDOI
Coating Additives for Improved Mechanical Reliability of Optical Fiber
TL;DR: In this article, the addition of nanosized particles of fumed silica to the polymer coating of fused silica optical fiber is shown to improve long-term mechanical properties of the fiber.
References
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Book ChapterDOI
Subcritical Crack Growth in Ceramics
TL;DR: In this paper, a design technique is presented to predict useful component lifetime from crack growth data after proof testing, based on fracture mechanics concepts, and the available crack growth is discussed with particular emphasis on fracture mechanisms.
Journal ArticleDOI
Strength Measurement of Optical Fibers by Bending
TL;DR: A bending technique for the strength measurement of glass fibers is described and an analysis is presented which determines the effective tested length as a function of the statistical parameters which describe the fracture properties of the fiber as discussed by the authors.
Journal ArticleDOI
Environmental Effects on the Static Fatigue of Silica Optical Fiber
TL;DR: Etude de l'influence du pH des solutions aqueuses dans lequelles sont trempees les fibres ainsi que l''influence de la presence ou non d'un revetement sur leur comportement de fatigue statique.
Journal ArticleDOI
Liquid nitrogen strengths of coated optical glass fibres
TL;DR: In this paper, the strength of plastic-coated glass fibres has been measured at liquid nitrogen temperatures using a bending technique, which yields data on the strengths of coated optical fibres in the absence of stress corrosion.
Journal ArticleDOI
Dependency of Fatigue Predictions on the Form of the Crack Velocity Equation
TL;DR: In this article, a computer search technique was developed to analyze fatigue strength data using both exponential and power law forms of the subcritical crack velocity equation, which best fit both the static and dynamic fatigue data of hot-pressed Si3N4 and optical glass fibers.