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A Response to Assertions that Fiber Manufactured in a Clean Room is Stronger and Less Susceptible to Fatigue

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A Response to Assertions that Fiber Manufactured in a Clean Room is Stronger and Less Susceptible to Fatigue

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  • Author: G. Scott Glaesemann, Mary C. Deneka
Fatigue, or crack growth, of a stressed flaw in glass has to do with glass chemistry and the availability of moisture in the service environment. None of these factors are affected by the cleanliness of the manufacturing process. Review papers on the subject of fiber strength and fatigue find little evidence to suggest that the fatigue is related to flaw size.4,5 There is, however, evidence that crack growth behavior in silica is independent of both flaw size and flaw source.6 We are skeptical about claims linking fatigue superiority to the manufacturing environment given the large body of published data, and our own research, on silica-clad fiber.

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