This paper examines the stress state in the fiber-matrix interface region (interphase) of resin-matrix composites. The stress state arises from the application of ex ternal loads and from in-built stress generated during cooling from the curing temperature. Based on the stress state in the interphase, a model has been proposed to tailor make and control the interphase in the development of damage tolerant composites. Scanning elec tron microscopy has been used to examine failure modes in the tested samples. Drop weight impact strengths have been measured on graphite and glass reinforced controlled interface composites.
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