THE NUMERICAL SIMULATION OF THE TWO POINT BENDING TEST OF THE OPTIC FIBER

摘要

Two point bending test is one of the most important method to measure the strength of fiber optic sensor. In the test employed the relationship between the two parallel plates. Displacement is determined in the optical fiber based on the assumption that the curve of the fiber between the two parallel plates is a quarter circle, and there is no friction between the optical fiber and the parallel plate. In fact this assumption is not true, and it's the main reason inducing the error. In this paper, the two point test is simulated numerically with finite element method. The fiber considered here are both coated and non-coated. There is no shape assumption during the test. The relationship of the maximum stress and the distance between the two parallel plates is established numerically and the results are compared with the experimental and analytic data in literatures.