Journal ArticleDOI
The effect of delaminations on local buckling in wind turbine blades
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TLDR
In this article, the effect of delaminations on the load carrying capacity of a large wind turbine blade is studied numerically, and it is concluded that delamination induced near-surface buckling modes have to be considered critical due to an onset of local sublaminate buckling below the design load level.About:
This article is published in Renewable Energy.The article was published on 2016-01-01. It has received 53 citations till now. The article focuses on the topics: Delamination & Buckling.read more
Citations
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Journal ArticleDOI
Damage detection techniques for wind turbine blades: A review
TL;DR: A comprehensive review of state-of-the-art damage detection techniques for WTBs, including most of those updated methods based on strain measurement, acoustic emission, ultrasound, vibration, thermography and machine vision are provided.
Journal ArticleDOI
Linear and nonlinear features and machine learning for wind turbine blade ice detection and diagnosis
Alfredo Arcos Jiménez,Fausto Pedro García Márquez,Victoria Borja Moraleda,Carlos Quiterio Gómez Muñoz +3 more
TL;DR: This paper presents a novel approach to detect and classify ice thickness based on pattern recognition through guided ultrasonic waves and Machine Learning, and considers four feature extraction methods to validate the results.
Journal ArticleDOI
Delamination analysis in composite laminates by means of Acoustic Emission and bi-linear/tri-linear Cohesive Zone Modeling
Milad Saeedifar,Mehdi Ahmadi Najafabadi,Jalal Yousefi,Jalal Yousefi,Reza Mohammadi,Hossein Hosseini Toudeshky,Giangiacomo Minak +6 more
TL;DR: In this paper, a combination of acoustic emissions (AE) signal localizations and scattering reduction procedure is implemented to determine the delamination tip position, and a tri-linear CZM can accurately determine both the initiation and propagation of delamination in the existence of fiber bridging.
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Impact assessment of a wind turbine blade root during an offshore mating process
TL;DR: In this article, a realistic scenario of the mating process and the consequences of such impact loads was investigated, and the results showed severe bending and plastic deformation of the guide pin bolt together with failure of the adjoining composite laminate at the root connection.
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Experimental investigation on structural collapse of a large composite wind turbine blade under combined bending and torsion
TL;DR: In this paper, the structural collapse of a composite blade under combined bending and torsion in a full-scale static load test was investigated and it was found that longitudinal compressive crushing failure and the following delamination of the spar cap are the root causes of the blade collapse.
References
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Journal ArticleDOI
Measurement of mixed-mode delamination fracture toughness of unidirectional glass/epoxy composites with mixed-mode bending apparatus
Malk Benzeggagh,M. Kenane +1 more
TL;DR: In this paper, the authors evaluated the initiation of cracking and delamination growth in a unidirectional glass/epoxy composite under mode I, mode ZZ, and mixed mode I + II static loading.
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Numerical simulation of mixed-mode progressive delamination in composite materials
TL;DR: In this paper, a new decohesion element with the capability of dealing with crack propagation under mixed-mode loading is proposed and demonstrated, which is used at the interface between solid finite elements to model the initiation and non-self-similar growth of delaminations in composite materials.
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Lamina properties, lay-up configurations and loading conditions for a range of fibre-reinforced composite laminates
TL;DR: In this article, the authors present a description of the laminates provided to all participants in an exercise to predict the strength of composite Laminates, including the elastic constants and the stress/strain curves for four unidirectional laminae.
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On the Flexure of Thin Cylindrical Shells and Other "Thin" Sections
TL;DR: In this article, it is shown that St. Venant's solution of the flexure problem is not supported by ordinary engineering practice, and recent experience in the use of high tensile steels and problems of aircraft structure have emphasised the desirability of a further examination of the Flexure problem.