Today, during their use, optical fibers are subject to harsher installation and environmental conditions. So to evaluate optical fiber lifetime with higher precision, it is necessary to study the mechanical behaviour of optical fibers in extreme conditions : high stress and harsh environment.
This paper presents the results of static bending tests in distilled water at temperatures between 20°C and 70°C and in buffer solutions with a pH between 4 and 9.The stresses applied on optical fiber were between 3 and 3.5 GPa.
We observed a dependence of the failure time on temperature. This dependence can be described by the Arrhenius model, where the activation energy is one of the main parameters. The n-value seems also to change regularly with temperature. The results obtained in buffer solutions show that the pH influence on optical fiber strength may depend on coating characteristics.