This paper numerically investigates the phenomenon of elastic wave (EW) propagation in large composite wind turbine blades and its suitability for damage detection. The study is performed using ANSYS® Mechanical finite element software on the model of NREL offshore 5MW baseline wind turbine blade. The source of elastic waves is a surface impact generating a broadband elastic wave pulse. The motion of elastic waves is illustrated in surface deformation plots and the key observations such as wave reflection, interference and scattering are addressed in discussion. The research also examines the interaction of the introduced waves with a surface crack perpendicular to the direction of wave propagation. It is concluded that medium and high frequency EWs have much higher sensitivity to this type of damage in comparison to low frequency EWs, and are argued to have a good potential for damage detection.
|Title of host publication||Proceedings of the 4th Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures SMAR 2017|
|Number of pages||8|
|Publication status||Published - 2017|
|Event||SMAR 2017: 4th International Conference on Smart Monitoring, Assessment and Rehabilitation of Civil Structures - ETH Zurich, Zurich, Switzerland|
Duration: 13 Sep 2017 → 15 Sep 2017
|Period||13/09/17 → 15/09/17|