Journal article
A qualitative analytical investigation of geometrically nonlinear effects in wind turbine blade cross sections
This paper analytically investigates the Brazier effect on asymmetric thin-walled sections subject to biaxial bending. In the latter case a torsional moment – in this paper referred to as Brazier torsion – is induced, which proved to be a vital part of the solution. By means of a generic cross section, that was inspired by a wind turbine blade, it is demonstrated that geometric nonlinear effects can induce an in-plane opening deformation in re-entrant corners that may decrease the fatigue life.
The opening effect induces Mode-I stress intensity factors which exceed the threshold for fatigue crack growth at loads well below the load-carrying capacity of the beam. The findings in this paper are twofold: Firstly, the investigated analysis procedure can be integrated into the design process of wind turbine blade cross sections.
Secondly, the proposed approach serves as a basis for computationally efficient numerical analysis approaches of structures that comprise complex geometry and anisotropic material behaviour – such as wind turbine rotor blades.
Language: | English |
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Year: | 2015 |
Pages: | 1-9 |
ISSN: | 18793223 and 02638231 |
Types: | Journal article |
DOI: | 10.1016/j.tws.2015.03.007 |
ORCIDs: | Eder, Martin Alexander and Bitsche, Robert |