Engineering Research Center on Wind Turbine Blades of Hebei Province

Xiangyang, China

Engineering Research Center on Wind Turbine Blades of Hebei Province

Xiangyang, China

Time filter

Source Type

Chen X.,CAS Institute of Engineering Thermophysics | Chen X.,Engineering Research Center on Wind Turbine Blades of Hebei Province | Zhao W.,Engineering Research Center on Wind Turbine Blades of Hebei Province | Zhao X.L.,CAS Institute of Engineering Thermophysics | And 3 more authors.
Engineering Failure Analysis | Year: 2014

Despite the enthusiastic pursuing for large wind turbine blades to reduce the cost of wind power, wind energy industry has witnessed a number of catastrophic blade failure accidents in recent years. In order to provide more insights into the failure of large blades, this short communication presents preliminary investigation on a 52.3. m composite blade designed for multi-megawatt wind turbines. Static loads were applied to simulate extreme load conditions subjected by the blade. After blade failure, visual inspection was carried out and failure characteristics of the blade were examined. It was found that the blade exhibited multiple failure modes. Among various failure modes observed, delamination of unidirectional laminates in the spar cap was identified to be the plausible root cause of the catastrophic failure of the blade. This study emphasized that through-thickness stresses can significantly affect the failure of large composite blades and provided some suggestions to the current design practices. © 2014 Elsevier Ltd.


Chen X.,CAS Institute of Engineering Thermophysics | Chen X.,Engineering Research Center on Wind Turbine Blades of Hebei Province | Zhao W.,Engineering Research Center on Wind Turbine Blades of Hebei Province | Zhao X.L.,CAS Institute of Engineering Thermophysics | And 3 more authors.
Energies | Year: 2014

This study presented a failure analysis of a 52.3 m composite wind turbine blade under static loading. Complex failure characteristics exhibited at the transition region of the blade were thoroughly examined and typical failure modes were indentified. In order to predict multiple failure modes observed in the tests and gain more insights into the failure mechanisms of the blade, a Finite Element (FE) simulation was performed using a global-local modeling approach and Progressive Failure Analysis (PFA) techniques which took into account material failure and property degradation. Failure process and failure characteristics of the transition region were satisfactorily reproduced in the simulation, and it was found that accumulated delamination in spar cap and shear web failure at the transition region were the main reasons for the blade to collapse. Local buckling played an important role in the failure process by increasing local out-of-plane deformation, while the Brazier effect was found not to be responsible for the blade failure. © 2014 by the authors.

Loading Engineering Research Center on Wind Turbine Blades of Hebei Province collaborators
Loading Engineering Research Center on Wind Turbine Blades of Hebei Province collaborators