Piezoelastic 1D model for bi-material structure applicable for wind turbine blades
Final Report Abstract
Piezoelectric composite laminates with an embedded or surface bonded piezoelectric layer form a part of new generation of adaptive engineering structures. The sensing and actuation capability of piezoelectric layers is used for achieving damage identification and compensation (health monitoring). To reach a quick response from the structure considering these objectives, an engineering electromechanical model is required which accounts for the mechanical pre-cracking in these hybrid laminates and provides an accurate prediction of the sensory and active interface response of the structure. The main goal of the performed investigations has been to model the straight line part of an idealized wind turbine blade under the action of static and time harmonic load and electric voltage by an analytical and simple shear lag model in order to analyse and detect possible elastic-brittle interface delamination. For this purpose numerical examples have been provided and illustrated by figures and discussed. For static and dynamic time harmonic loading together with a constant electrical displacements, the interface elastic-brittle debond lengths have been calculated and parametric analysis has been done. A new criterion for detecting the interface delamination and the safety zone of the structure under static mechanical and constant electric displacements is proposed and defined, respectively. Further work to be done could be investigations on hygrothermalpiezoelastic bi-material structures and respective interface delamination at static and time-harmonic loading, heat and moisture fluxes.
Publications
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Elastic-brittle and cohesive interface behavior of a bi-material structure under dynamic time harmonic loading. Application to a wind turbine rotor blade. Compte Rendue de l’Academie Bulgare des Sciences 65 (2012), 1275-1284
J. Ivanova, V. Valeva, W. Becker
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Piezoelastic 1D model for bi-material structure applicable for wind turbine blades. Proceedings of the DCB 2012 Conference, International Conference on Civil Engineering, Design and Constructions, 13.-15.09.2012, Varna Free University “Chernorizets Hrabar”, Varna, Bulgaria, 412-418
Ivano V. Valeva, T. Petrova, J. Ivanova, W. Becker
