Interfacial shear strength between optical fiber and resin

To control the length and the direction of the embedded fiber, the optical fiber pull-out test is re-designed. According to finite element results, the shear stress distributions on fiber parts during the new designed test are accordance with that of the former ones. The maximum experimental error for conesponding stress is less than 5%. Therefore, a new model with fiber penetrating matrix is designed. Tests are carried out to study the interfacial shear strength between the embedded optical fiber and the matrix. Two kinds of optical fibers, normal single mode fiber and c-coated one, are studied. Fiber pull-out test results show that the mean interfacial shear strength between the coating and the clad is weaker. Since the interfacial shear stress between the coat and the clad is related to the normal stress of the matrix around the embedded optical fiber, the applied normal load on smart composite is limited. Otherwise, once the material is overloaded, flaws are appeared between the coating and the clad of the optical fiber. It decreases the mechanical performance of the formed intelligent structure.