Structure of knitted fabric is that unidirectional fiber bundles are aligned in multi direction and linked with knitted yarn. Therefore, knitted fabric has good mechanical properties with no crimps and need low cost with omission of the stacking process. In this study, bending property and lap joint property of the wet-on-wet joint for knitted fabric composites were investigated. For the roving knitted fabric composites, the final fracture of the wet-on-wet joint occurred brittly. In the case of roving/mat knitted fabric composites, the onset and growth of the delamination were restrained between mat and mat layer, whereas the mechanical properties were lower than the knitted fabric composites without mat. From these results, new concept was proposed in order to prevent brittle delamination; the knitted fabric composites with hybrid matrix layer with flexible resin. The new composites could restrain the onset and growth of matrix crack and delamination, so that the lap joint property was improved without decrease in bending property.
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