ABSTRACT
The objective for this study was to develop a theoretical model based on the ideal elasto-plastic constitutive law for the protective coating of the optical fiber. An optical fiber sensor was embedded in each of the concrete specimens with pre-cast side cracks in order to keep the final crack location within the gauge length of the fiber optic sensor for measurement of axial strains, as shown in figure 1. The analysis for the theoretical model in this paper is based on the following assumptions:
(1) Both the glass core and the cladding are considered as the same material and collectively referred to as the fiber core. And the fiber core is assumed to be a linear elastic material.
