Matrix cracks and their effect on ultimate laminate strength in [0/90] s type graphite/epoxy laminates were investigated. Crack saturation density was found ex perimentally and compared with that predicted using a finite element analysis. Good agreement was found. To estimate the effect of the 90°-ply cracks on the load capacity of adjacent 0°-plies, a soft but tough adhesive film was placed along the interfaces in some laminates to isolate the effect of the matrix cracks. The use of adhesive layers in [0/90 8 /0] and [90 4 /0 2 /90 4 ] laminates raised the laminate strengths by about 30%.
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Sun et al. (1987) studied this question.
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