Abstract
The objective of the investigation was to understand the influence of bending-twisting coupling—present in most composite laminates—on the buckling strength of rectangular plates. By neglecting the bending-twisting coupling stiffnesses, simple closed form expressions can often be derived, but these ‘orthotropic’ equations give non-conservative approximations for the buckling load. A perturbation approach was used in combination with the orthotropic expressions, and was seen to give very good results with far less computation than in, e.g., finite difference or finite element calculations. It is well known that the buckling load can be varied considerably by changing the layup, and the perturbation approach was used to investigate whether an optimization algorithm based on the simple orthotropic expressions also would find the optimal layup when bending-twisting coupling is present. This was seen to be the case.
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