Engineering Production Defect Assessment And Repair Researches Of Wind Turbine Blade

Fiber-reinforced composites have been an important engineering matreial because of its excellent mechanical and designable features,and it has been used increasingly in aviation,aerospace,shipbuildings, vehicles and wind power. Structural composites has varies inner defects after molding,such as pores,voids,cracks. The reliability of composite material structures reduced because the defects with its surrounding materials has different strength and modulus.Therefore the study on the assessment of the internal defects in composite is important.The failure process of glass/epoxy matrix composites were studied by both numerical and experimental methods.3D finite model was established by Abaqus finite-element software,the element damage judgement and stiff reduction of the damaged element were carried out during the analysis,at last the residual strength of the material with delaminations was obtained. Compression test were carried out on unidirectional laminate test specimens with and without delaminations, and the effect of the delamination's position and size on compressive properties of the material obtained from the test. Studies shows that, good agreement was obtained between finite-element predictions and experimental measurements.Repair experimental study of wind turbine blade with delaminations was conducted, and mechanical properities of test pieces obtained by experimental test, result show that the repaired wind turbine blade can meet the normal requirements.