1 February 1992 Determination of safe design stress
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Mechanical stress on optical fiber must be low enough to insure that the fiber does not fracture due to static fatigue. In this paper sample data are presented to illustrate the calculation of design stress. The methodology is based on the concepts of linear elastic fracture mechanics, although a strictly empirical treatment of the data would yield essentially the same result. The calculation involves extrapolation of a plot of time to failure versus applied stress. It also requires extrapolation to low failure probability, as well as corrections for the amount of fiber under stress. The temperature and humidity are taken to be constant over the service life, and equal to the worst case field conditions. The calculations require both strength and fatigue data. The example illustrates the relative magnitude of the various terms in the equation for static fatigue lifetime, such as the term for applied stress, the term for failure probability, and the term for amount of fiber under stress. It also shows the sensitivity of the lifetime prediction to uncertainties in the various parameters.
© (1992) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Daniel R. Roberts, Enrique Cuellar, Michael T. Kennedy, and John E. Ritter "Determination of safe design stress", Proc. SPIE 1580, Fiber Optic Components and Reliability, (1 February 1992); doi: 10.1117/12.135367; https://doi.org/10.1117/12.135367


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