Failure Prediction Using Improved Interactive Failure Criteria for Wind Turbine Blade
Keywords:
Wind turbine blade, matrix failure, failure envelope, action plane coefficients, FPCL coding, ply by ply discount method, transverse stress.Abstract
Wind energy is a non polluting cost-effective renewable energy source. Wind power technology in India has grown to many folds in the last decade. Capacity of wind turbines have been increased significantly and at the same time, the cost of generating power from wind has come down. The blades used in the wind turbine are of composite material with aerodynamic profile, twisted tip and varying thickness along its length. Composite wind turbine blades are observed to fail due to matrix compression. Available failure theories are not capable of predicting the maximum stress in transverse compressive – shear stress region. Hence a new set of failure criteria for predicting the failure of composite wind turbine blade is proposed. The criterion is examined with both unidirectional and bidirectional experimental results for wind turbine blade material. The results of failure prediction of unidirectional lamina and multi directional laminate are encouraging. The stress strain prediction is also compared with experimental data sets. The proposed criterion is compared with the criterion proposed by the participants of World wide Failure Exercise (WWFE). The criterion is further extended to composite laminate using classical lamination theory and ply by ply discount procedure using specially designed coding (FPCL). The coding accepts the effect of non linearity and thermal effects. Using the coding it is possible to predict initial and final failure, delamination and mode of failure.
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