| Summary: | 碩士 === 國立交通大學 === 機械工程學系 === 99 === This thesis studies the design methodology and failure behavior of composite sandwich wind blades. In the shape design of a composite sandwich wind blade, the appropriate blade shape which can produce sufficient twisting moment to rotate the generator is determined, the airfoil aerodynamic conditions are incorporated into the blade element theory to calculate the wind loads on the blade, and the matching between generator and wind blades are designed. Several tests have been performed to verify the suitability of the adopted models for predicting wind loads on the blade. In the structural design of the composite sandwich wind blade, the finite element code ANSYS is used to perform the structural analysis and determine the lamination arrangement of the blade. In the failure analysis, the progressive failure processes of the 1m and 2.5m long blades are determined to determine the failure locations, failure modes, first-ply failure loads, and collapse loads of the blades. For the 1m long blade, the difference between the theoretical and experimental collapse loads is less than 17%. The theoretical maximum wind speed for the 2.5m long blade is 131m/s.
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