29 December 1999 Activation energy and entropy of dynamic fatigue of pristine silica optical fibers
Author Affiliations +
Proceedings Volume 3848, Optical Fiber Reliability and Testing; (1999) https://doi.org/10.1117/12.372759
Event: Photonics East '99, 1999, Boston, MA, United States
Subcritical crack growth in fused silica can be modeled as a stress assisted chemical reaction between water and strained bonds at the crack tip. The stress influences the crack growth rate by reducing the free energy of the activated complex. In principal, the stress changes both the activation enthalpy (energy) and entropy; however, the influence of stress on entropy has generally been ignored. The dynamic fatigue behavior of `pristine' optical fiber can be used to determine the fatigue kinetics parameters with unprecedented precision. It is shown that the entropy contribution is at least as significant as the enthalpy and therefore should not be ignored.
© (1999) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yunn-Shin Shiue, Yunn-Shin Shiue, M. John Matthewson, M. John Matthewson, "Activation energy and entropy of dynamic fatigue of pristine silica optical fibers", Proc. SPIE 3848, Optical Fiber Reliability and Testing, (29 December 1999); doi: 10.1117/12.372759; https://doi.org/10.1117/12.372759

Back to Top