708 石英ガラス光ファイバの静的および動的環境強度特性に及ぼす人工微小欠陥と水環境の影響(GS-3 強度・破壊(2))

概要

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An investigation has been carried out concerning the influence of wet environment on the fracture behavior of silica glass optical fiber. Tensile tests were conducted in vacuum, dry air, laboratory air, and deionized water with two different displacement rate: 8.3×10^<-3> mm/s and 8.3×10^<-6> mm/s, which is referred to as SSRT. Tension-tension fatigue tests were conducted under sinusoidal waveform in vacuum, dry air, laboratory air and deionized water. Tensile tests were also conducted for the fibers with Vickers diamond indentation crack. For tensile tests, the strength decreased with an increase in the amount of moisture in the environment. Tensile strength of SSRT test was lower than that of high displacement rate irrespective of environment. For fatigue tests, the strength also decreased with an increase in the amount of moisture in the environment. The fracture surfaces were observed with a high-resolution field emission type scanning electron microscope and quantitatively analyzed to correlate the fracture behavior of the fiber to the area of mirror and indentation-induced crack.
2004-03-17