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A single-fiber pull-out model composite for an Aramid/epoxy system was specially designed to measure the stress distribution of the Aramid fiber embedded in the matrix using micro-Raman spectroscopy. The stress transfer length of the fiber was about 300 μm. Stress distribution in the fiber changed after the onset of 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 fiber stress. As the applied stress was decreased step by step after the debonding, this larger stress peak was considered to be attributed to the residue of the previous stress distribution caused by the fiber/matrix interfacial friction on the debonded interface.

Evaluation of the Interfacial Properties in an Aramid Fiber/Epoxy Model Composite using Micro-Raman Spectroscopy