摘要
本文利用 Si- O键离解的唯象系统解释稳定开裂速度和动态、静态疲劳现象 ,其结果具有指数形式并适应于不同大小的缺陷、工作应力和试验环境。而且通过保留指数函数展开式的第一项简化为指数定律。本模型从疲劳的角度 ,为比较不同光纤的组成、服务环境、应力 -时间关系曲线(静态 -动态 )等提供了合理的物理基础 ,将该模型应用于石英和掺 Ti O2 石英光纤 ,对有关疲劳的性质进行了深刻的洞察并进一步指明了控制这种行为的基本原理。
A phenomenological formulation of Si O bond dissociation is utilized to interpret stable crack velocity and dynamic fatigue phenomena. The resulting model has an exponential form and is applicable to a wide range of flaw sizes, service stresses, and test environments. Furthermore, it is readily reduced to the power law by retaining the first term of the series expansion of the exponential function. The model provides a sound physical basis for comparing different fiber compositions, service environments, and stress time histories (static versus dynamic) from the fatigue point of view. The application of the model to silica and titania doped silica optical fibers provides a valuable insight into their related fatigue behavior and sheds further light on the fundamental mechanism controlling such behavior.
出处
《光纤与电缆及其应用技术》
2000年第4期17-25,共9页
Optical Fiber & Electric Cable and Their Applications
关键词
光纤
静态疲劳
动态疲劳
唯象疲劳模型
optical fiber reliability
activation energy
static fatigue
dynamic fatigue
titania doped optical fiber
