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Modern high-cycle fatigue criteria were implemented in structural wind turbine parts using finite element method. As a result of a test carried out for two fatigue criteria, it was concluded that the Dang Van hypothesis has more conservative results than S-N method. The complete algorithm of the fatigue calculation was illustrated by applying the proposed procedures to a wind turbine hub which is subjected to multi-axial, non-proportional and non-constant amplitude high-cycle loadings and then a structural optimization method is used to reduce the weight and moment of inertia of the wind turbine rotor. ANSYS Workbench and nCode design life are used in the structural and fatigue modeling of the hub.

A nonlinear inverse finite element method is developed for estimation of initial blank shape and strain distribution in final shape. This method often based on implicit static algorithms, causes sometimes convergence problems because of strong nonlinearities. In order to avoid the converging problems, especially in the quasi vertical walls, an appropriate initial guess is introduced. By using this initial guess, the number of iterations in the nonlinear numerical solution is decreased, solution speed is significantly increased and complicated geometries can be analyzed by this method with good accuracy. Application to a Srail part shows good agreement between commercially available finite element software and IFEM results.