Single-fiber pull-out analysis comparing the intensities of singular stress fields (ISSFs) at fiber end/entry points

Abstract

This paper deals with a partially-embedded single-fiber under pull-out force in comparison with a single fiber embedded in matrix focusing on two distinct singular stress fields. Then, the intensities of the singular stress fields (ISSFs) are compared at the fiber end named Point A and the fiber/surface intersection named Point E. The results show that if the embedded length lin is shorter, interface debonding may occur at Point A. Instead, if lin is longer, the interface debonding may occur at Point E. To analyze the ISSFs accurately, a mesh-independent technique coupled with the finite element method (FEM) is indicated by applying the same FEM mesh pattern to the pull-out model and the reference model. As the reference solution, a single fiber embedded in matrix is also calculated under arbitrary material combinations by using the body force method (BFM). Stress distributions along the fiber/matrix interfaces are also calculated for carbon and glass fibers.