Compression Strength of Wrinkled Composite Laminates

MSc degree in Wind Energy at DTU in Denmark, and MSc degree in Aerospace Engineering at TU Delft in the Netherlands - Wrinkle defects are prevalent in wind turbine blades and are a leading cause of blade failure. Accurate modeling of the compression strength of wrinkled composite laminates is needed by manufacturers. Based on the creation of a parametric nite element model of a through-thickness wrinkle defect, along with a series of geometric and material parameter studies, this research seeks to determine the compressive strength of various kinds of wrinkled composite laminates. A 2D FE model of alternating layers of elastic-plastic matrix and elastic orthotropic ber laminae is used. Plastic microbuckling (kinking) strength is given by the limit load, while delamination strength is determined from a maximum shear stress criterion. The main conclusion is that compression strength of a wrinkled laminate is strongly dependent on the maximum initial fiber misalignment angle. There is also strong sensitivity to the height to length ratio. Furthermore it is found that higher matrix yield strength increases compression strength. Finally, it is found that in hybrid wrinkles, an increasing amount of carbon increases the compression strength.

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