Bifurcation Buckling Analysis of Delaminated Composites Using Global-Local Approach

A global-local finite element method to analyze multiple delamination in composite laminates has been developed. To enhance computational efficiency, layerwise elements are used in the delaminated zone and first order beam bending elements are used in the undelaminated zone. A transition element is used between global and local zones. A postprocess method is utilized to convert the layerwise variables to those of first order shear model. By introducing this novel matching scheme, the laminated composites with multiple delaminations can be analyzed without a significant increase in memory capacity. When applied to multiple delamination problems, the buckling predictions of the the global-local method agree well with other known results.

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