Static fatigue life of silica optical fibers and the significance of fiber coating and handling

2001 ◽  
Author(s):  
Arne Skontorp ◽  
Julie Cammas
Keyword(s):  
Fatigue Life ◽  
Optical Fibers ◽  
Static Fatigue ◽  
Fiber Coating

Activation Energy for Strength Degradation of Fused Silica Optical Fibers

1998 ◽  
Vol 531 ◽  
Author(s):  
Yunn-Shin Shiue ◽  
M. John Matthewson
Keyword(s):  
Activation Energy ◽  
Optical Fibers ◽  
Pure Water ◽  
Strength Degradation ◽  
Fused Silica ◽  
Static Fatigue ◽  
Buffer Solution ◽  
Silica Fibers ◽  
Apparent Activation Energies ◽  
Stress Dependent

AbstractThe strength degradation behavior of fused silica optical fiber is well known to be sensitive to the temperature and an apparent activation energy can be determined. In addition, it has been observed that the activation energy also depends on the applied stress and the nature of the environment. However, no consistent model for this behavior has emerged. We propose a chemical kinetics model which accounts for the temperature dependence of the dissociation of water which predicts that degradation should be faster in pH 7 buffer than in pure water. Static fatigue of fused silica fibers in both water and pH 7 buffer solution has been carefully studied as a function of temperature to test the model. The apparent activation energies are stress dependent, and, while the dependency is not clear, different environments give different dependencies. These observations support the proposed model.

Improvement of Fatigue Strength and Impact Properties of Plain-Woven CFRP Modified with Micro Fibrillated Cellulose

2008 ◽  
Vol 47-50 ◽  
pp. 133-136 ◽  
Author(s):  
Norifumi Takagaki ◽  
Kazuya Okubo ◽  
Toru Fujii
Keyword(s):  
Fatigue Life ◽  
Fatigue Strength ◽  
Carbon Fiber ◽  
Impact Load ◽  
Static Fatigue ◽  
Test Results ◽  
Static Properties ◽  
Impact Properties ◽  
Matrix Cracks ◽  
The Matrix

This study investigated the effect of the enhancement by addition of Micro Fibrillated Cellulose (MFC) on the static, fatigue and impact properties of plain-woven CFRP. Test results showed that the addition of MFC little contributed to the improvement of static properties. However, the initiation of matrix cracks between woven carbon fiber cloths was prevented under cyclic loading so that the fatigue life of the CFRP was improved by the modification with MFC. The ductility of plain-woven CFRP was also acquired under impact load by the addition of the MFC to the matrix.

Applications of Active Thin Film Coatings on Optical Fibers

1996 ◽  
Vol 459 ◽  
Author(s):  
G. R. Fox ◽  
C.A.P. Muller ◽  
C. R. Wüthrich ◽  
A. L. Kholkin ◽  
N. Setter ◽  
...  
Keyword(s):  
Thin Film ◽  
Optical Fiber ◽  
Optical Fibers ◽  
Phase Shifters ◽  
Film Coatings ◽  
Thin Film Coatings ◽  
Fiber Coating ◽  
Wavelength Tunable ◽  
Fiber Devices ◽  
Recent Developments

ABSTRACTActive thin film coatings on optical fibers provide a variety of functions that are being used to develop active all-fiber optical devices. Two types of active coatings that are of interest for device development include resistive and piezoelectric coatings. Resistive coatings can be used to heat an optical fiber, while piezoelectric coatings can be used to strain the fiber. Localized changes in the fiber waveguiding properties can be achieved by electrically activating the fiber coating. These coated fibers show promise for applications such as optical phase shifters and modulators.Recent developments in the fabrication of diffraction gratings within the core of an optical fiber have provided the means for making a variety of intra-core reflection and band pass filters. By combining these passive intra-core fiber devices with active coatings, wavelength tunable devices have been demonstrated. Wavelength tunable devices are expected to have a variety of applications in telecommunications and sensing networks. A review of recent developments in fiber coating and analysis techniques, device fabrication, and applications of active all-fiber devices are presented along with a discussion of which coating materials are of interest in active devices.

Aging of Silica Optical Fiber in Static Fatigue Tests

2016 ◽  
Vol 859 ◽  
pp. 3-8
Author(s):  
Noella Evano ◽  
Rochdi El Abdi ◽  
Marcel Poulain
Keyword(s):  
Optical Fiber ◽  
Optical Fibers ◽  
Fatigue Tests ◽  
Hot Water ◽  
Static Fatigue ◽  
Time To Failure ◽  
Thermal Dependence ◽  
Arrhenius Model ◽  
Bending Stresses ◽  
Silica Optical Fiber

During their use, optical fibers are subject to harsh installation and environmental conditions. To evaluate more precisely the lifetime of an optical fiber, it is necessary to study the mechanical behavior of optical fibers under extreme conditions, in particular under mechanical and thermal stress.This paper presents the results of new silica optical fibers aged in hot water between 20°C and 70°C and subjected to mechanical static bending stresses from 3 GPa to 3.5 GPa. Thermal dependence of the time to failure was observed. This dependence can be described by the Arrhenius model, where the activation energy is one of the main physical characteristic.

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