A full-scale 34 m composite wind turbine blade was tested to failure under flap-wise loading. Local displacement measurement equipment was developed and displacements were recorded throughout the loading history.
Ovalization of the load carrying box girder was measured in the full-scale test and simulated in non-linear FE-calculations. The nonlinear Brazier effect is characterized by a crushing pressure which causes the ovalization. To capture this effect, non-linear FE-analyses at different scales were employed. A global non-linear FE-model of the entire blade was prepared and the boundaries to a more detailed sub-model were extracted. The FE-model was calibrated based on full-scale test measurements.
Local displacement measurements helped identify the location of failure initiation which lead to catastrophic failure. Comparisons between measurements and FE-simulations showed that delamination of the outer skin was the initial failure mechanism followed by delamnination buckling which then led to collapse.
|Number of pages||10|
|Early online date||12 Jul 2006|
|Publication status||Published - Oct 2006|
|Event||15th International Conference on Composite Materials - Durban, South Africa|
Duration: 27 Jun 2005 → 02 Jul 2005
ASJC Scopus subject areas
- Civil and Structural Engineering
- Ceramics and Composites