Research On Erosion Resistance Of Wind Turbine Blade Coating

Generally placed in the regions with wind borne sand, Wind turbine blades,especiallythe tip sites which are eroded severely, need the high demand for the anti-erosion coating.The yield deformation causes the defects in the coating surface, thus speed up the processof coating erosion during rotation leaves.Plastic polyurethane materials is commonly used for coating of the wind turbine blade.Based on the preliminary theoretical analysis of the polyurethane coating, the paper makethe finite element simulation.Numerical simulation use the ABAQUS finite elementsoftware to establish elastic-plastic erosion model,to use Mises yield criterion for the tipcoated sand erosion simulation,and compare the numerical results with theoreticalanalysis.Changing the coating thickness for another analysis,the thickness range can havea preliminary selection.The results shows that:(1)Positive impact of the sands is the dominant factor of stress concentration in thecentral region of the internal section;in the same wind environment, the oblique load leadcoating yield easily.(2)The stress distribution of the unit is consistent with stress wave propagation, thecoating unit of the initial position is commonly greater than the internal element stress;Size of sand erosion velocity is the key factor to make coating microstructure yield.(3)Under the impact of three-particle, the cumulative effect of the Yield deformationcan be showed as: the overall appearance of the coating is characterized by large plasticdeformation and displacement folds,the central region of the surface appears brittlefracture.(4)The results of the numerical simulation is in accordance with the damagecharacteristics of erosion theory, verify the correctness and feasibility. In the progress ofthe erosion, dynamic fracture mode of the coating are plastic fracture caused by yield andfracture caused by stress wave; The most serious erosion to the coating is the impactcaused by sands in oblique loading mode.(5)The total thickness range of3~6mm is further reduced to the range of4mm.