Initiation of trailing edge failure in full-scale wind turbine blade test

Haselbach, Philipp Ulrich; Branner, Kim

doi:10.1016/j.engfracmech.2016.04.041

Cited by 47 publications

(38 citation statements)

References 16 publications

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“…Furthermore, the combined shell-solid modelling approach allows Strain Energy Release Rates (SERR) and/or to simulate failures in the trailing edge to be predicted, since the adhesive bondline can be separated. This advantage allows for the investigation into the eect of adhesive bondline defects in the trailing edge on the blade response as, for example, presented in Haselbach et al [9,21].…”

Section: Discussionmentioning

confidence: 99%

“…Longitudinal and transverse surface strains along the adhesive trailing edge joint were measured using bre-sensing equipment from HBM FiberSensing as well as conventional electrical resistance strain gauges. More details concerning the experiment can be found in the Reference section [9,18].…”

Section: Ltt Load Casementioning

confidence: 99%

“…The absolute and relative displacements of the trailing edge were compared at a load level of 80%. A load level of 80% was chosen because at this load level, no failure had occurred, whereas for higher load levels, shear core failure in the sandwich material (as reported in [21]) occurred. As a consequence, for load levels above 80%, a change in the structural response occurred, which would have to be included with, for example, progressive damage models, in order to account for a change in the stiness matrix in the numerical model which considered the stiness degradation of the sandwich panel in the full-scale test after failure onset, respectively.…”

Section: Ltt Load Casementioning

confidence: 99%

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An advanced structural trailing edge modelling method for wind turbine blades

Haselbach

2017

Composite Structures

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This study demonstrates an advanced blade modelling approach based on a combination of shell and solid elements which can enhance the reliability of structural predictions for wind turbine blades. The advanced blade modelling approach is based on a shell element model where the adhesive bondline in the trailing edge region is discretised by means of solid brick elements which are connected via Multi-Point-Constraint to the shell elements. The new approach overcomes the drawbacks of pure shell element simulations and can reliably predict the response of wind turbine blade structures which are exposed to ultimate loads. The prediction accuracy of the numerical simulations was compared to a certication load case and a full-scale ultimate limit state test of a 34m wind turbine rotor blade. The displacements, stresses and strains show reasonably good agreement and demonstrate the capabilities of the advanced blade modelling approach.

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Section: Discussionmentioning

confidence: 99%

Section: Ltt Load Casementioning

confidence: 99%

Section: Ltt Load Casementioning

confidence: 99%

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An advanced structural trailing edge modelling method for wind turbine blades

Haselbach

2017

Composite Structures

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“…Blade lengths of more than 100 m and turbines of more than 12 MW were available on the market in 2018 [1]. However, wind turbine blades had increased failure rates or decreased reliability as simple designs with small rotor diameters progressed to more advanced technologies with bigger rotor spans [2].…”

Section: Introductionmentioning

confidence: 99%

Influence of Structural Configurations on the Shear Fatigue Damage of the Blade Trailing-Edge Adhesive Joint

Chen

Wang

et al. 2020

Applied Sciences

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Wind turbines are under continuous development for large-scale deployment and oceanization, leading to the requirement of longer blades. The economic losses caused by blade replacement and shutdown have increased. The downtime caused by blade issues in a wind turbine is 8-20% of the total downtime. Many of these blade issues originate from the cracking of the blade trailing edge. The edge is more susceptible to damage due to the complex geometry, manufacturing technique, and operation conditions. The traditional design method and the expensive experimental research are not suitable for the accurate damage analysis of the trailing-edge adhesive because of simplifying assumptions and costs. This study aimed to investigate the influence of trailing-edge structural configurations on the shear fatigue life of the trailing-edge adhesive joint using finite element and stress transformation matrix (STM) methods. The structural configurations of the blade trailing edge included the position of unidirectional fiber layer (UD), chamfer of bonding line, prefabricated components, and outer over-lamination of the trailing edge. In this study, the finite element method was used to simulate the blade structure. The shell element was used for laminates, and the solid element was used for the trailing-edge adhesive joint. The basic shear fatigue properties of the adhesive were obtained by standard component tests. The shear fatigue life of the blade trailing-edge adhesive joint under given load conditions was calculated using the fatigue properties of the adhesive and STM method. The results showed that the angle of chamfering, location of UD, rigidity of the preform, and outer over-lamination all had an obvious influence on the fatigue damage of trailing-edge adhesive. The findings of this study can be used to guide blade structure design and blade production and maintenance.

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“…In (Haselbach, 2017;Haselbach and Branner, 2015) a model consisting of shell elements for the laminate and solid elements for the adhesive at the trailing edge joint was used to predict the behavior of a blade under ultimate leading edge to trailing edge load.…”

Section: Introductionmentioning

confidence: 99%

High-fidelity finite element models of composite wind turbine blades with shell and solid elements

Peeters

Santo

Degroote

et al. 2018

Composite Structures

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Abstract:A novel approach for creating highly detailed finite element models of wind turbine blades is presented. The approach is implemented as a software tool which handles all the different steps of the model creation process. The novel approach considers the blade to consist of a collection of parametric predefined blocks. This allows wind turbine blade models consisting of shell elements, solid elements or combinations to be created. By including the tools to accurately partition the outer mold layer, create the required offset surfaces and calculate accurate element-wise material orientations, a high level of detail and fidelity can be achieved.Keywords: wind turbine blade, finite element modelling, solid mesh IntroductionWind turbine blade designs have been increasing in size during the last decades. They are complex structures, both in terms of shape and layup of composite materials. The rotor is at the very beginning of the energy conversion chain, turning airflow into mechanical energy. Consequently, the blades are at the beginning of a cost cascade system. For example, reducing the blade mass allows for cost savings in many other turbine components. Meanwhile, the aerodynamic performance directly contributes to the overall cost of energy (COE) of the turbine. As a result, there is great value in optimizing blades. Nevertheless, current wind turbine blades are often designed with relatively high safety factors. However, relatively large

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Initiation of trailing edge failure in full-scale wind turbine blade test

Cited by 47 publications

References 16 publications

An advanced structural trailing edge modelling method for wind turbine blades

An advanced structural trailing edge modelling method for wind turbine blades

Influence of Structural Configurations on the Shear Fatigue Damage of the Blade Trailing-Edge Adhesive Joint

High-fidelity finite element models of composite wind turbine blades with shell and solid elements

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