Structural collapse characteristics of a 48.8 m wind turbine blade under ultimate bending loading

Bending Behavior Analysis of Box Beams with the Reinforcement of Composite Materials for Wind Turbine Blades

“…Other studies [7,8] prove that the structural collapse of a WTB is the consequence of the combination of various failure modes: (1) spar cap buckling, (2) separation of the first layer, (3) bulge in the center of the cut, (4) detachment of the adhesive at the trailing edge, (5) matrix cracking, (6) the influence of the blade's weight, (7) manufacturing imperfections effects, and (8) the Brazier effect, mainly local buckling on the suction side of the airfoil (spar cap). Therefore, it is necessary to investigate the structural performance to predict the deformation and, in turn, the deviation of the WTB tip due to extreme deflections [9].…”

“…On the contrary, Kam et al compared his experimental results with the simulation results, finding a difference of more than 10% [6]. Other authors compare their experimental results with FEM [8,9,25,26]. Likewise, the configurations in numerical analysis and the lack of standardized test procedures and experimental techniques imply differences in the results [27].…”

Fractographic analysis of sandwich panels in a composite wind turbine blade using optical microscopy and X-ray computed tomography

“…Previous studies investigated fracture and failure of sandwich panels in the full-scale blade tests [1][2][3][4][5] and in fields [6]. These studies provided good understandings of failure mechanisms primarily from a structural perspective.…”

“…It is known that sandwich panels may exhibit one or more failure modes, i.e., face fracture, core shear failure, face wrinkling, debonding, general buckling, shear crimping, face dimpling and local indentation [7]. For the sandwich panels used in composite wind turbine blades, skin laminate fracture, core shear failure and skin/core debonding are among the most reported failure modes as found in [1][2][3][4][5][6]. The formation of each failure mode is often due to progressive damages and may interact with other failure modes due to local details.…”

Study on the Effect of Different Delamination Defects on Buckling Behavior of Spar Cap in Wind Turbine Blade

“…In engineering applications, it is found that the delamination defects of UDL (unidirectional laminate) generated in manufacturing or transportation will reduce the strength of the spar cap. Material defects lead to premature failure of blades when subjected to the identified load in static tests or fatigue tests [6][7][8][9][10][11][12][13][14]. Some studies present that delamination and other defects caused by stress will significantly reduce the blade's global performance, especially the buckling at the trailing edge [15][16][17].…”