Repair of Composite Aero-Structures

A special issue of Journal of Composites Science (ISSN 2504-477X). This special issue belongs to the section "Composites Applications".

Deadline for manuscript submissions: closed (31 August 2021) | Viewed by 2755

Special Issue Editors


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Guest Editor
Applied Mechanics Laboratory, Mechanical Engineering and Aeronautics Department, University of Patras, Rio Campus, 26500 Patras, Greece
Interests: composite materials and structures; non-destructive testing (NDT) and structural health monitoring; nanocomposites; multifunctionality of materials
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Guest Editor
Department of Mechanical Engineering and Aeronautics, University of Patras, 26504 Patras, Greece
Interests: damage tolerance design; finite element (FE) modeling; optimization and parametric modeling; manufacturing and testing procedures
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

In recent years, the use of composite materials has sharply increased. Properties such as high strength to weight and stiffness to weight ratios and high corrosion resistance as well as the flexibility they offer in design render composite materials necessary in aeronautics. In cases of failure, the replacement of composite components is extremely costly and thus repairing them is preferred. In the aviation industry, bonded repairs are dominant because they ensure improved load transfer and joint efficiency. However, FAA regulations permit the application of bonded joints only in secondary components and some of the primary structures of an aircraft. The need to reduce maintenance and repair costs is a driving force for the approval and implementation of bonded joints in more of the primary structures of an airplane. Hence, the optimization of bonded repairs as well as the development of proper non-destructive techniques to determine the structural reliability of these joints are two major issues that concern the aviation industry.

In this regard, the main aim of this Special Issue is to present a collection of investigations focused on methods for repairing composite materials, the procedures followed during repair, and the factors determining the final mechanical properties of the repaired component. Aspects that will be included are non-destructive testing (NDT) damage identification, damage categorization, types of repair of the composite, surface treatment, application of the repair patch, and the curing of the patch. In this Special Issue, several scientific challenges and opportunities will be identified in order to develop and design cost-effective and certifiable composite repair technologies, including monitoring and automation of repairs.

Prof. Vasilis Kostopoulos
Dr. Spyridon Psarras
Guest Editors

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Keywords

  • Composite
  • Repair
  • FE Modeling
  • Optimization
  • NDT
  • Automation

Published Papers (1 paper)

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Research

13 pages, 9100 KiB  
Article
Investigating the Effect of Stepped Scarf Repair Ratio in Repaired CFRP Laminates under Compressive Loading
by Spyridon Psarras, Theodoros Loutas, Magdalini Papanaoum, Orestis Konstantinos Triantopoulos and Vasilis Kostopoulos
J. Compos. Sci. 2020, 4(4), 153; https://doi.org/10.3390/jcs4040153 - 19 Oct 2020
Cited by 7 | Viewed by 2242
Abstract
In this work the effectiveness of stepped repairs to damaged fiber reinforced composite materials is investigated by using previously validated numerical models which were compared with tested repaired composite plates. Parametric studies were carried out in order to assess the scarf ratio (i.e., [...] Read more.
In this work the effectiveness of stepped repairs to damaged fiber reinforced composite materials is investigated by using previously validated numerical models which were compared with tested repaired composite plates. Parametric studies were carried out in order to assess the scarf ratio (i.e., step length to ply thickness ratio) influence on ultimate forces, displacements, stresses and stiffnesses. FE models with repair scarf ratios varying from the value of 20 to the value 60 with a step increase of 10 were developed. The numerical models allowed a direct comparison of the influence that the scarf ratio had to the strength and stiffness restoration of the repaired composite structure. The study verifies that the restoration of the strength of a damaged laminate depends largely on the size of the repair patch. Generally, the bigger the size of a patch, the stronger the repaired structure is, up to a critical threshold size. To maximize the strength restoration, it is advised that the number of steps in each patch are no less than the number of plies on the base laminate. Full article
(This article belongs to the Special Issue Repair of Composite Aero-Structures)
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