Abstract
In order to develop a cutting tool and estimate structural reliability of optical glass fiber, the fracture behavior of toughened fiber treated with Ti dope was examined through fractography and the acoustic emission method. As a result of investigating the fractography of a fiber observed by SEM in relation to maximum amplitude and peak frequency of the AE pulse, it was experimentally shown that an entirely mirrorlike end of the optical glass fiber could be produced only when the maximum amplitude of AE pulse was small, and the peak frequency was low. Furthermore, both the compressive stress remaining in the fiber and fracture stress during cutting were estimated theoretically. The optimum size of cutter cracked defects was clarified from the viewpoint of fracture mechanics, so as to produce an entirely mirrorlike end of optical glass fiber. Thus a new method for evaluating the mirror quality end of optical fiber available for light communication by detecting the AE pulse emitted on cutting was developed.
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