In recent years, interlaminar toughened laminates are developed in which resin rich layers are placed in interlaminar regions in order to enhance the interlaminar fracture toughness of CFRP laminates. Tensile tests are conducted on CFRP cross plylaminates with interlaminar resin layer at 0/90 interfaces. Transverse crack density is measured as a function of the laminate strain. To investigate temperature effect, tests are conducted at room temperature and 80℃. Laminate configurations are crossply (0/A/90{sub}m/A/0) where A denotes interlaminar resin layer and m= 4, 8 and 12. The experimental results are compared with the theoretical prediction based on the two dimensional analysis considering the interlaminar resin layers and thermal residualstresses. The validity of the energy criterion and strength criterion is discussed.
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