Investigation of structural bond lines in wind turbine blades by sub-component tests

Sayer, F. P.; Antoniou, Alexandros; Wingerde, Arnoldus van

doi:10.1016/j.ijadhadh.2012.01.021

Cited by 68 publications

(30 citation statements)

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“…Typical failure modes observed in full-scale blade tests includes adhesive joint debonding, sandwich core failure and composite laminate failure. In recent years, subcomponent testing has been used [6][7][8][9][10] to understand the structural behavior of critical parts of composite blades. The subcomponent testing could be an important complement to the full-scale blade tests that are mandatory for certification of wind turbine blades.…”

Section: Introductionmentioning

confidence: 99%

Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis

Xiao

Berring

Madsen

et al. 2019

Composite Structures

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S. (2019). Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis. Composite Structures, 214, 422-438. https://doi.Please cite this article as: Chen, X., Berring, P., Madsen, S.H., Branner, K., Semenov, S., Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis, Composite Structures (2019), doi: https://doi. Abstract:This paper presents a comprehensive study on structural failure of a trailing edge section cut from a composite wind turbine blade. The focus is placed on understanding progressive failure behavior of the trailing edge section in subcomponent testing during its entire failure sequence. Digital Image Correlation (DIC) is used to capture buckling deformation and strain distributions of the specimen. Detailed post-test inspection is performed to identify failure modes and failure characteristics. A nonlinear Finite Element (FE) model that accounts for all observed failure modes is developed based on continuum damage mechanics and progressive failure analysis techniques. Multiple structural nonlinearities originate from buckling, and contact and material failures are included in the model to predict the failure process. The study shows that in addition to the buckling-driven failure phenomenon, the surface contact of sandwich panels contributes to the failure process of the trailing edge section. Foam materials start to fail before the ultimate load-carrying capacity of the specimen is reached, while both composite materials and adhesive materials fail in the post-peak regime.The matrix-dominant failure and delamination develop before the fiber-dominant failure in composite laminates. The proposed FE model captures the progressive failure process of the trailing edge section reasonably well.

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Section: Introductionmentioning

confidence: 99%

Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis

Xiao

Berring

Madsen

et al. 2019

Composite Structures

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show abstract

“…The critical strain energy release rate under the loading conditions of mode I and II were defined as G I and G II , respectively. The experimental value of G I can be calculated according to equation (1) [33], and G II can be calculated according to equation (2) [34]. The G I and G II from test results was 0.36 kJ m −2 and 0.84 kJ m −2 , respectively.…”

Section: Mechanical Characterization Of Adhesive Jointsmentioning

confidence: 99%

Acoustic emission response and progressive failure behaviors of composite adhesively bonded joints loaded by Mode I and II

Liu

Shen

Zhang

et al. 2019

Mater. Res. Express

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The analysis of progressive failure process is one of the critical issues in the research of composite adhesive joints. In view of this point, acoustic emission (AE) is applied to real-time monitoring of the dynamic damage process of composite adhesive joints in some loading modes such as Mode I (double cantilever beam (DCB)) and Mode II (end notch flexures (ENF)). Furthermore, the high speed camera and scanning electron microscopy are carried to analyses the damage mechanisms of composite bonded joints. Results show that there are significant differences in the load-deflection curves of the specimens under the loads of Mode I and II. The main failure mode of the two types of loading modes is adhesion failure, and the accumulation of damage observed at the edge of the adhesively bonded layer cause defeat of the composite bonded joints. In addition, AE parameters including amplitude, hits, energy, and duration are connected with the fail mechanism. Furthermore, the dynamic characteristics of the AE signal, especially amplitude spectrum distribution, can provide evidences for studying progressive failure behaviors of composite adhesive joints.

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“…Typical failure modes observed in the box beams used in the wind turbine blades include spar cap delamination, shear web fracture, debonding of adhesive joints, foam core failure, laminate cracks, etc. [1][2][3][4][5][6][7]. These failures may occur as a chain of events in the failure process driven by competing failure mechanisms.…”

Section: Introductionmentioning

confidence: 99%

Modeling multiple failures of composite box beams used in wind turbine blades

Xiao

Tang

Yang

2019

Composite Structures

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Large composite structures, such as composite wind turbine blades, may exhibit multiple failure modes that challenge the modeling strategies and methodologies designers adopt in finite element (FE) analysis. This study develops a comprehensive and general FE modeling method to simulate interactive failure process of composite box beams used in wind turbine blades. The composite box beams are the primary loading-carrying members and could show different failure modes due to competing failure mechanisms. A continuumdamage mechanics based progressive failure analysis approach is developed in three-dimensional stress/strain domain to simulate failure behavior of the box beams. Structural nonlinearities associated with geometry, materials and contact are included. The material failures considered in this study are composite failure with three material failure modes, foam core crushing and adhesive failure. The in-plane shear stress versus strain relation of unidirectional composites is included in the material damage model. Comprehensive comparisons are made between numerical simulations and experimental observations with respect to strain response, ultimate loads, failure modes and failure progress. The modeling approach is found to be capable of predicting both strength and failure of box beams with reasonable accuracy and it exhibits great potential to predict failure response of composite wind turbine blades.

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Investigation of structural bond lines in wind turbine blades by sub-component tests

Cited by 68 publications

References 1 publication

Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis

Understanding progressive failure mechanisms of a wind turbine blade trailing edge section through subcomponent tests and nonlinear FE analysis

Acoustic emission response and progressive failure behaviors of composite adhesively bonded joints loaded by Mode I and II

Modeling multiple failures of composite box beams used in wind turbine blades

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