The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform
Kun-ming Lin - One of the best experts on this subject based on the ideXlab platform.
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The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers
Materials Chemistry and Physics, 2004Co-Authors: Sham-tsong Shiue, Ting-ying Shen, Hao Ouyang, Kun-ming LinAbstract:The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers is theoretically analyzed. A closed form solution of the tensile stress in the glass fiber is obtained from viscoelastic theory. The tensile stress in the glass fiber in the Static Fatigue test increases with time due to the viscoelastic behavior of the polymeric coatings, and this increase will accelerate the failure of the optical fiber. The long-term strength of optical fibers can be improved by increasing the axial rigidities and the relaxation times of the secondary coating and the tight jacket. Finally, a rule to prevent the overestimation of fiber's lifetimes in the Static Fatigue test is proposed. (C) 2003 Published by Elsevier B.V
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The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers
Materials Chemistry and Physics, 2003Co-Authors: Sham-tsong Shiue, Ting-ying Shen, Hao Ouyang, Kun-ming LinAbstract:Abstract The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers is theoretically analyzed. A closed form solution of the tensile stress in the glass fiber is obtained from viscoelastic theory. The tensile stress in the glass fiber in the Static Fatigue test increases with time due to the viscoelastic behavior of the polymeric coatings, and this increase will accelerate the failure of the optical fiber. The long-term strength of optical fibers can be improved by increasing the axial rigidities and the relaxation times of the secondary coating and the tight jacket. Finally, a rule to prevent the overestimation of fiber’s lifetimes in the Static Fatigue test is proposed.
Sham-tsong Shiue - One of the best experts on this subject based on the ideXlab platform.
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The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers
Materials Chemistry and Physics, 2004Co-Authors: Sham-tsong Shiue, Ting-ying Shen, Hao Ouyang, Kun-ming LinAbstract:The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers is theoretically analyzed. A closed form solution of the tensile stress in the glass fiber is obtained from viscoelastic theory. The tensile stress in the glass fiber in the Static Fatigue test increases with time due to the viscoelastic behavior of the polymeric coatings, and this increase will accelerate the failure of the optical fiber. The long-term strength of optical fibers can be improved by increasing the axial rigidities and the relaxation times of the secondary coating and the tight jacket. Finally, a rule to prevent the overestimation of fiber's lifetimes in the Static Fatigue test is proposed. (C) 2003 Published by Elsevier B.V
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The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers
Materials Chemistry and Physics, 2003Co-Authors: Sham-tsong Shiue, Ting-ying Shen, Hao Ouyang, Kun-ming LinAbstract:Abstract The effect of polymeric coatings on the Static Fatigue of tightly jacketed double-coated optical fibers is theoretically analyzed. A closed form solution of the tensile stress in the glass fiber is obtained from viscoelastic theory. The tensile stress in the glass fiber in the Static Fatigue test increases with time due to the viscoelastic behavior of the polymeric coatings, and this increase will accelerate the failure of the optical fiber. The long-term strength of optical fibers can be improved by increasing the axial rigidities and the relaxation times of the secondary coating and the tight jacket. Finally, a rule to prevent the overestimation of fiber’s lifetimes in the Static Fatigue test is proposed.
Jayantha Ananda Epaarachchi - One of the best experts on this subject based on the ideXlab platform.
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Effects of Static–Fatigue (tension) on the tension–tension Fatigue life of glass fibre reinforced plastic composites
Composite Structures, 2006Co-Authors: Jayantha Ananda EpaarachchiAbstract:The effects of Static–Fatigue interaction on tension–tension Fatigue life of glass fibre reinforced plastic (GFRP) composites were investigated. This paper proposed a new Static–Fatigue model, which is capable of predicting residual strength after a period of Static loading. Also an algorithm is proposed to calculate Fatigue lives with the inclusion of Static–Fatigue interaction. Predictions from the proposed Static–Fatigue model show a good agreement with the experimental results. Static–Fatigue interaction has shown a considerable effect on Fatigue lives of GFRP composites at intermediate and lower applied stress levels possibly due to a longer exposure to applied loads. At higher load levels approximately greater than 65% of ultimate stress, and higher stress ratios range like 0.5 < R < 0.9, Fatigue lives shown to be closer to material’s Static–Fatigue limits which is shorter than the expected lifetime by cyclic Fatigue.
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Effects of Static Fatigue on the tension-tension Fatigue life of glass / polyester composites
2005Co-Authors: Jayantha Ananda EpaarachchiAbstract:The effects of Static-Fatigue interaction on tension-tension Fatigue life of Glass/Polyester composites were investigated using Fatigue and Static-Fatigue experimental data available in the literature. An empirical Static-Fatigue model was proposed. Predictions from the Static-Fatigue model and calculation of Fatigue life with the Static-Fatigue interaction show a good agreement with the experimental results. Static-Fatigue interaction has shown a considerable effect on Fatigue lives of GFRP composites at intermediate and lower applied stress levels possibly due to a longer exposure to applied loads. At higher load levels approximately greater than 65% of ultimate stress, and higher stress ratios range like 0.7
Zhou Huijiu - One of the best experts on this subject based on the ideXlab platform.
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The effect of the microstructure on the Static Fatigue behaviour of Si3N4
Journal of Materials Science, 1997Co-Authors: Wang Hongjie, Wang Yonglan, Jin Zhihao, Zhou HuijiuAbstract:The effect of the microstructure on the Static Fatigue behaviour of two Si3N4 samples containing different sintering aids has been studied. The results show that the Static Fatigue behaviours of the two samples are consistent with each other in various media, i.e. the rate of crack growth of both materials is greatest in water, followed by air, and then kerosene. A distinctive microstructure endows one of the samples with a higher fracture toughness. In turn this results in a higher crack propagation resistance and a longer service life at the same stress level.
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Mechanical and environmental factors in the cyclic and Static Fatigue of a machinable glass-ceramic
International Journal of Fatigue, 1996Co-Authors: Qiao Guanjun, Wang Yonglan, Jin Zhihao, Zhou HuijiuAbstract:Abstract The effects of environment on cyclic and Static Fatigue behaviour were investigated with a machinable glass-ceramic and its original glass. Tests were conducted at ambient temperatures in three environments, i.e. moist air, distilled water and kerosene, and an indentation/bending technique was used. The results indicate that cyclic loading increases crack growth rates of glass-ceramic in all the three environments, but it just has a negligible effect on the original glass. The two materials were very sensitive to the amount of water in the test environment. For Static Fatigue of the glass-ceramic, both the slopes of d a d t-K eff curves and their position along the abscissa varied with the environments, but under other conditions, only the position varied.
Brenna Skelley - One of the best experts on this subject based on the ideXlab platform.
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Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading—Commonality of Slow Crack Growth in Advanced Ceramics
Journal of Engineering for Gas Turbines and Power, 2014Co-Authors: Sung R. Choi, D. Calvin Faucett, Brenna SkelleyAbstract:An extensive experimental work for Pyroceram™ 9606 glass-ceramic was conducted to determine Static Fatigue at ambient temperature in distilled water. This work was an extension and companion of the previous work conducted in dynamic Fatigue. Four different applied stresses ranging from 120 to 170 MPa was incorporated with a total of 20–23 test specimens used at each of four applied stresses. The slow crack growth parameters n and D were found to be n = 19 and D = 45 with a coefficient of correlation of rcoef = 0.9653. The Weibull modulus of time to failure was in a range of msf = 1.6 to 1.9 with an average of msf = 1.7±0.2. A life prediction using the previously-determined dynamic Fatigue data was in excellent agreement with the Static Fatigue data. The life prediction approach was also applied to advanced monolithic ceramics and ceramic matrix composites based on their dynamic and Static Fatigue data determined at elevated temperatures. All of these results indicated that a SCG mechanism governed by a power-law crack-growth formulation was operative, a commonality of slow crack growth in these materials systems.
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Slow Crack Growth of a Pyroceram Glass Ceramic Under Static Fatigue Loading: Commonality of Slow Crack Growth in Advanced Ceramics
Volume 6: Ceramics; Controls Diagnostics and Instrumentation; Education; Manufacturing Materials and Metallurgy, 2014Co-Authors: Sung R. Choi, D. Calvin Faucett, Brenna SkelleyAbstract:An extensive experimental work for Pyroceram™ 9606 glass-ceramic was conducted to determine Static Fatigue at ambient temperature in distilled water. This work was an extension and companion of the previous work conducted in dynamic Fatigue. Four different applied stresses ranging from 120 to 170 MPa was incorporated with a total of 20–23 test specimens used at each of four applied stresses. The slow crack growth parameters n and D were found to be n = 19 and D = 45 with a coefficient of correlation of rcoef = 0.9653. The Weibull modulus of time to failure was in a range of msf = 1.6 to 1.9 with an average of msf = 1.7±0.2. A life prediction using the previously-determined dynamic Fatigue data was in excellent agreement with the Static Fatigue data. The life prediction approach was also applied to advanced monolithic ceramics and ceramic matrix composites based on their dynamic and Static Fatigue data determined at elevated temperatures. All of these results indicated that a SCG mechanism governed by a power-law crack-growth formulation was operative, a commonality of slow crack growth in these materials systems.