Experimental study on static characteristics of wind turbine blade withdigital image correlation method

A wind turbine blade was tested for the full-field 3D deformations under biaxial static loads by making use of digital image correlation method. The results show that the 3D displacements of the wind turbine blade are well distributed while the strains are not. Among the three displacements, the out-of-plane displacement is much larger than the in-plane displacement. The flapwise displacements and edgewise displacements of the wind turbine blade induced by biaxial loads increase as the load increases. In the full field of the wind turbine blade, the flapwise displacements along the spanwise increase gradually, reaching maximum at the blade tip. The edgewise displacements of the wind turbine blade are all compressive displacements, the maximum of which are generated in the middle part of the blade. The spanwise displacements generated by biaxial loading are almost 0 in the region of 0~41% of the blade length. In the rest region of the blade, the tensive spanwise displacements are generated at the beginning of the loading, and compressive spanwise displacements are yielded as the load increases.