Compressive failure behavior of composite laminates containing open hole was investigated systematically through the mechanical tests and damage monitoring studies of the multidirectional composite laminates (T300/924C [45/- 45/0/90]_(3s) and T800/924C [45/0/-45/90]_(3s)). Fibre microbuckling in the 0° plies, surrounded by delamination, occurred in the vicinity of the hole prior to catastrophic fracture. The microbuckling, which leads to extensive in and out-of-plane fibre kinking, extends stably under increasing load before becoming unstable at a critical length of 2-3mm (depends on the specimen geometry) along the specimen width. The effect of a single 3mm diameter hole in a 30mm wide plate is to reduce the gross section strengths by about 40% and 38%, respectively when compared to the unnotched failure strength. The failure strengths were predicted successfully the open hole strength for both materials, less than 7% difference when compared to the measured experimental results.
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