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J. Banaszek

The fracture propagation velocity in optical fibers

Polimery 1999, No 10, 678

DOI: dx.doi.org/10.14314/polimery.1999.678


Quartz-glass optical fibers coated with a two-layer polymeric coat are described. The parameters A and n (equations 5—7), describing the growth of crack in the fiber, were found to be interrelated. Dynamic and static studies on optical-fiber fatigue strength, carried out in media differing in humidity (Fig. 1), involving a load increased at a constant rate and a fixed load, confirmed this interrelation. The experimental parameters describing the growth of the crack and the reported data on direct investigations on flaws developed in silica glass, allowed to calculate the rate of cracking in optical fibers. The resulting rates were compared with the flaw growth velocity in glass samples (Fig. 3). The values were different and the differences were ascribed to the effect of the polymer coat which reduces the transport of moisture to the tip of the crack in the light-guide fiber. In the analysis and calculations of the crack development rate, use was made of a stress corrosion model and of the relationships based on fracture mechanics.

Keywords: flaw propagation velocity, optical fibers, glass fibers, comparative studies, fracture mechanics

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