Journal
COMPOSITE STRUCTURES
Volume 76, Issue 1-2, Pages 52-61Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2006.06.008
Keywords
structural testing; wind turbine blades; non-linear mte element analysis; sub-modelling; failure mechanism; brazier effect; anticlastic effect
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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. (c) 2006 Elsevier Ltd. All rights reserved.
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