Abstract
The ultimate strength of composite laminates containing elliptical openings can be predicted reasonably well using two fracture models which utilize the first ply failure strength of the notched and corresponding unnotched laminates. These models have the capability to predict the fracture strength of anisotropic laminates with an opening of general construction and subjected to general in-plane loading. Although the characteristic lengths for the present models are determined empirically, it is found that the characteristic lengths for an elliptical opening of any aspect ratio can be expressed in a closed-form function. These parameters are determined using three (e.g., two circular holes and one crack) or more data points. The experimental result shows that the notched strength of the graphite/epoxy cross-ply laminate is quite sensitive to the opening aspect ratio.
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