Repair of wind turbine blades: Review of methods and related computational mechanics problems

Composite materials have gained popularity in automotive industries due to its lightweight potential, good damping behaviour as well as high strength and stiffness properties. Based on the increase in usage of composites, there is a growing interest for a repair technique in the automotive industry. Along with these raise in demand there comes a need for an all-inclusive review article and the objective of this article is to address this need. Two repair techniques, namely scarfing repair and injection repair, have the potential to be used in automotive industry. This paper compiles the various research work done in this field of repairing along with various processing steps associated with it. Further this paper reviews the non-destructive technique that can be used for damage identification and repair assessment.

Potential repair techniques for automotive composites: A review

The objective of this study is to determine the mixed-mode I+II interlaminar fracture toughness at high mode I content for a 0°/45° ply interface. Mixed-mode I+II delamination tests on unidirectional and multidirectional specimens were performed using ADCB and AMMF methods. The procedure used for choosing the stacking sequence resulted in desirable propagation behaviors of the delamination. There was no change of delamination plane, an acceptable crack front profile, no initial specimen curvature, and no energy dissipation through global specimen damage. For data reduction, the experimental compliance method was the most consistent in determining the total energy release rate. Finite element simulation proved to be an indispensable analysis tool. A resin-rich interlayer was modeled at the delamination interface to eliminate the non-convergence behavior of the energy release rate. For delamination between plies of different orientations, the mode decomposition could only be analyzed by the finite element method. The ADCB configuration offered a very high mode I content (90-95%) while the AMMF offered a moderately high mode I (70-78%).

Mixed-mode delamination of multidirectional composite laminates at 0°/θ° ply interfaces

Laminated composite materials are increasingly used for the design of aircraft primary structures subjected to complex 3D loadings. The delamination observed in curved parts ensuring the junction between the different perpendicular panels is one of the most critical failure mechanisms. The present article proposes a complete protocol to identify the out-of-plane tensile strength of specimens composed of unidirectional plies. Firstly, a method to design a four-point bending (4 PB) test on L-angle specimens has been proposed. Secondly, a test campaign on T700GC/M21 laminated L-angle specimens has been performed at ONERA. Thirdly, the analysis of these tests with different methods has been performed to demonstrate that such a test is relevant to determine the material out-of-plane tensile strength, which seems to be independent of the stacking sequence and of the total thickness of the specimen, thus allowing the use of this strength in a 3D failure criterion. Finally, the different advantages and drawbacks of 4 PB tests performed on curved beams are discussed.

Determination of the out-of-plane tensile strength using four-point bending tests on laminated L-angle specimens with different stacking sequences and total thicknesses

Here, a nanomaterial with morphology‐controlled nanoscale capillaries is utilized to overcome manufacturing challenges in layered polymeric architectures. It is demonstrated that the capillary pressure from a nanoporous film replaces the need for applied pressure to manufacture void‐free layered polymeric architectures. Manufacturing of aerospace‐grade advanced carbon fiber composites is performed for the first time without utilizing pressure from an autoclave. Combined with a conductive curing approach, this work allows advanced composites to be manufactured without costly oven or pressure vessel infrastructure. The nanomaterial‐enabled capillary pressure is quantified as 50% greater than typical pressures used in such processing, and is anticipated to overcome the limitations imposed by the requirement of high applied pressure in many other applications such as adhesive joining of various bulk materials including metals, press forming, and closed‐mold infusion processing of layered composites and polymers.

Void‐Free Layered Polymeric Architectures via Capillary‐Action of Nanoporous Films

'Conventional' or certified repair procedures for impacted composite structures (i.e. patches) are time consuming, and must be performed by highly qualified staff. In this paper, a cost effective and simple repair method by liquid resin infiltration is studied. As damages on aircraft structures are generally due to impact, this kind of damage is characterised and compared to quasi-static indentation with ultrasonic inspection and micrographic cuts. The repair by liquid resin is used to fill in the very special damage pattern region organised as a crack network (delamination and transverse cracks). In order to study this new repair method, an experimental set-up has been manufactured and different configurations have been studied. Mechanical testing (CAI, DCB and ENF) was then performed to evaluate the strength of this repair. As good results were achieved, further exploration under complex loading should be performed to ensure the quality of the repair for an industrial application.

Investigation of composite repair method by liquid resin infiltration

Development of a new fracture test to identify the critical energy release rate: The Tensile Flexure test on Notched Specimen

Les materiaux composites ont des performances specifiques exceptionnelles mais restent neanmoins sensibles aux sollicitations d'impact. Les solutions de reparation actuelles sont souvent couteuses et excessives par rapport aux dommages les plus rencontres que sont les dommages d'impact faible energie. Dans cette etude, nous presentons un procede de reparation original base sur l'infiltration de resine dans le reseau de fissures crees par impact. Un modele analytique a ete developpe et permet de s'assurer une bonne combinaison physico-chimique de la resine de reparation avec le materiau a reparer. Des essais mecaniques ont par ailleurs ete realises sur des panneaux repares afin de demontrer les capacites du procede de reparation. L'essai de compression apres impact a ete selectionne car il est largement utilise industriellement et c'est un des essais les plus discriminants pour les structures composites. Afin de comprendre les mecanismes de ruine de la reparation, des essais complementaires issus de la mecanique de la rupture ont ete realises. Aujourd'hui les resultats sur structure reparee sont de tres corrects contrairement aux essais elementaires dont la qualite semble dependre grandement de la tenacite des resines de reparation injectees.

https://hal.archives-ouvertes.fr/hal-00389232/document

Réparation des composites par infiltration de résine = Investigation of a composite repair method by liquid resin infiltration

Popular Tasks used by Researchers

How can I help with your research?

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

We encountered an error while loading the panel. Please try refreshing the page.

Something went wrong

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

Anyone with the link can view this chat. You can switch it back to private anytime.

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Mathieu Hautier

Author Tools

Chat about Author

Papers

Investigation of composite repair method by liquid resin infiltration

Development of a new fracture test to identify the critical energy release rate: The Tensile Flexure test on Notched Specimen

Réparation des composites par infiltration de résine = Investigation of a composite repair method by liquid resin infiltration