Abstract
A method for measuring the residual stress at the interface in fiberreinforced composites is presented in this study. The residual strains (stresses) at the interface are released by pushing the fiber out. The released residual strains are measured using an electron moire technique, which can fabricate grids with frequencies up to 10,000 lines/mm on the composites surface so that a displacement sensitivity of 100nm can be achieved. This method can be applied to almost all fiber-reinforced composites, such as metal-matrix composites (MMCs) and fiberreinforced plastics (FRPs). It provides a new experimental technique for measuring interfacial residual stress in MMCs, and a unique method for FRPs. Measurements of the interfacial residual stresses in SiC/Ti-15-3 and boron/epoxy composites show the validity of the method.
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