Abstract
A single-fiber pull-out model composite for an aramid/epoxy system was specially designed to measure the stress distribution of an aramid fiber embedded in the matrix using micro-Raman spectroscopy. The stress transfer length of the fiber was about 300μm. Stress distribution of the fiber changed after the fiber/matrix interfacial debonding and the fiber axial stress showed the maximum at a certain point in the debonded region, which was larger than the applied pull-out stress. As the applied stress was decreased gradually after the debonding, this larger stress peak was considered to be caused by the holding of the previous stress by the fiber/matrix interfacial friction.
