Finite element modelling of a composite wind turbine blade with fully-bonded and partically unbonded trailing edge

Download
2018
Özyıldız, Meltem
In this thesis, strength analysis of an existing 5-meter glass-fiber epoxy composite wind turbine blade subjected to monotonic loading condition is presented. Finite element analysis is employed to simulate the virtual testing of the blade and understand the failure modes/mechanisms which may lead to the ultimate failure of the blade. CAD Model of the blade is prepared using NX 10.0 and ANSYS ACP/Pre module is utilized for building the material model of the blade. The evaluation of the stresses is carried out with two different approaches: linear elastic analysis using Tsai-Wu criteria and linear elastic analysis using Puck criteria. Linear analysis is carried out with ANSYS ACP/Post module. Analysis of the blade is also performed with the blade that has debonding in the trailing edge between the suction and pressure sides because the most critical damage occurs as debonding between suction and pressure sides of the blade. After the analysis of the blade, ANSYS ACP/Post module is used for the visualization of the results. Critical components and regions with the highest risk of failure are identified and the effect of debond region is assessed. The simulation results will be utilized to calibrate a 5-m blade test set-up and predict and compare with failure modes from blade testing.

Suggestions

STATIC ANALYSIS OF A COMPOSITE WIND TURBINE BLADE USING FINITE ELEMENT MODEL
Ozyildiz, Meltem; Çöker, Demirkan (2017-05-17)
This study is presented here that the stress characteristics of an existing 5-meter composite wind turbine blade for 30 kW wind turbine designed for METUWIND is known by using finite element method. Modal and static analysis is performed in order to obtain static and dynamic behavior of the blade. To perform analysis, the geometric three-dimensional model of the blade is obtained by using two-dimensional drawings of the blade. After geometric modeling of the blade, the materials that are used in blade struc...
Comparative study of transient and quasi-steady aeroelastic analysis of composite wind turbine blade in steady wind conditions
Sargın, Hakan; Kayran, Altan; Department of Aerospace Engineering (2014)
The objective of this study is to conduct a comparative study of the transient and quasi-steady aeroelastic analysis of a composite wind turbine blade in steady wind conditions. Transient analysis of the wind turbine blade is performed by the multi-body dynamic code Samcef Wind Turbine which uses blade element momentum theory for aerodynamic load calculation. For this purpose, a multi-body wind turbine model is generated with rigid components except for the turbine blades. For the purposes of the study, a r...
Development of a high fidelity finite element model of a wind turbine blade via modal testing
Amer, Chadi; Şahin, Melin; Department of Aerospace Engineering (2015)
The design of an optimised horizontal axis 5-meter-long wind turbine rotor blade, is a research and development project, in order to fulfil the requirements of high efficiency torque-from-wind production. For this purpose, a research study is presented here, by investigating the structural characteristics of a composite wind turbine blade via finite element modelling and experimental modal analysis. At first, modal tests are performed by using various sensor-actuator pair combinations. After that the geomet...
Design and analysis of test rig for small scale wind turbine blade
İçen, Mustafa.; Çöker, Demirkan; Department of Aerospace Engineering (2019)
In this thesis, a test setup for the experimental 5 meter RÜZGEM wind turbine blade and that can be used for small scale wind turbine blades up to 9 meter is designed and analyzed. The purpose of this thesis is to help establishing the test infrastructure under METUWIND project such as NREL, RISØ, CRES. The literature on the existing facilities is reviewed. After that, RÜZGEM wind turbine blade is introduced and design loads are presented. To apply these loads appropriately to the blade, the moment distribu...
Investigation of the effect of bending twisting coupling on the loads in wind turbines with superelement blade definition
Gözcü, Mehmet Ozan; Kayran, Altan; Department of Aerospace Engineering (2014)
In this thesis study, the effect of off-axis plies in the spar caps of a wind turbine blade on the damage equivalent loads in a wind turbine system is investigated. The off-axis plies in the spar caps are exploited for load alleviation in the whole turbine system since the off-axis plies induced bending-twisting coupling into blades of wind turbine. Damage equivalent load is used to assess the effect of bend twist coupled blade on the fatigue load reduction in the whole wind turbine system. NREL's 5 MW turb...
Citation Formats
M. Özyıldız, “Finite element modelling of a composite wind turbine blade with fully-bonded and partically unbonded trailing edge,” M.S. - Master of Science, Middle East Technical University, 2018.