Durabillity of Fibre to Polymer Adhesion: Interfacial Strength in FRPs

A special issue of Fibers (ISSN 2079-6439).

Deadline for manuscript submissions: closed (15 October 2019) | Viewed by 14555

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Guest Editor
Institute of Polymer and Composites, Hamburg University of Technology (TUHH), Denickestrasse 15, D-21073 Hamburg, Germany
Interests: fiber polymer composites; thin-ply composites; nanomaterials; environmental impact; durability; life time prediction; damage modelling
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Institute of Polymer and Composites, Hamburg University of Technology (TUHH), Denickestrasse 15, D-21073 Hamburg, Germany

Special Issue Information

Dear Colleagues,

The use of fibre-reinforced polymers (FRPs) in more and more structural components, and the rising number of materials available in conjunction with the lack of standardisation, are increasingly leaving manufacturers facing a difficult choice. The types of fibre and polymer matrix determine the performance in terms of the mechanical properties, processability, cost efficiency, durability, and sustainability. But what should be the emphasis of the selection process? In recent years, it has been shown that in many applications, it is not the maximum fibre properties but the interfacial properties that are important. This is especially true when the composites are exposed to severe environmental conditions (e.g., higher humidity), however, at the same time, knowledge about their lifetime properties is essential. However, far too often the structure of the fibre–matrix interface is hardly known.

In this Special Issue dedicated to the fibre-to-polymer adhesion and the interfacial strength in FRPs, original research papers and reviews, are welcome. The aim is to increase knowledge about the long-term behaviour of reinforcing fibres of all kinds, and their interfaces in polymer composites. For this purpose, studies dealing with the effects of moisture, temperature, salinity, or UV radiation are particularly desirable. Fundamental studies (experimental or modelling) on fibre sizing or treatments, as well as investigations on single fibres, bundles, or laminates are also desirable.

I hope that this Special Issue will provide to the scientific community both an insight to the fibre–matrix interphase and their lifetime determining properties.

Prof. Dr. Bodo Fiedler
Guest Editor

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Keywords

  • Glass fibre reinforced polymers (GFRP)
  • Carbon fibre reinforced polymers (CFRP)
  • Natural fibre reinforced polymers (NFRP)
  • Interface/Interphase phenomena
  • Sizing and surface modification
  • Durability and long term effects
  • Mechanical properties
  • Hygrothermal properties
  • Transverse failure / strength
  • Experimental techniques / modelling
  • Condition monitoring

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Published Papers (2 papers)

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Research

14 pages, 2479 KiB  
Article
Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics
by Andreas T. Echtermeyer, Andrey E. Krauklis, Abedin I. Gagani and Erik Sæter
Fibers 2019, 7(12), 107; https://doi.org/10.3390/fib7120107 - 6 Dec 2019
Cited by 12 | Viewed by 5778
Abstract
Understanding the strength degradation of glass and carbon fibers due to exposure to liquids over time is important for structural applications. A model has been developed for glass fibers that links the strength reduction in water to the increase of the Griffith flaw [...] Read more.
Understanding the strength degradation of glass and carbon fibers due to exposure to liquids over time is important for structural applications. A model has been developed for glass fibers that links the strength reduction in water to the increase of the Griffith flaw size of the fibers. The speed of the increase is determined by regular chemical dissolution kinetics of glass in water. Crack growth and strength reduction can be predicted for several water temperatures and pH, based on the corresponding dissolution constants. Agreement with experimental results for the case of water at 60 °C with a pH of 5.8 is reasonably good. Carbon fibers in water and toluene and glass fibers in toluene do not chemically react with the liquid. Subsequently no strength degradation is expected and will be confirmed experimentally. All fiber strength measurements are carried out on bundles. The glass fibers are R-glass. Full article
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23 pages, 17569 KiB  
Article
Effects of Hygrothermal Ageing on the Interphase, Fatigue, and Mechanical Properties of Glass Fibre Reinforced Epoxy
by Dennis Gibhardt, Audrius Doblies, Lars Meyer and Bodo Fiedler
Fibers 2019, 7(6), 55; https://doi.org/10.3390/fib7060055 - 14 Jun 2019
Cited by 36 | Viewed by 8259
Abstract
Reliability and cost-effectiveness represent major challenges for the ongoing success of composites used in maritime applications. The development of large, load-bearing, and cyclically loaded structures, like rotor blades for wind or tidal energy turbines, requires consideration of environmental conditions in operation. In fact, [...] Read more.
Reliability and cost-effectiveness represent major challenges for the ongoing success of composites used in maritime applications. The development of large, load-bearing, and cyclically loaded structures, like rotor blades for wind or tidal energy turbines, requires consideration of environmental conditions in operation. In fact, the impact of moisture on composites cannot be neglected. As a result of difficult testing conditions, the knowledge concerning the influence of moisture on the fatigue life is limited. In this study, the impact of salt water on the fatigue behaviour of a glass fibre reinforced polymer (GFRP) has been investigated experimentally. To overcome the problem of invalid failure during fatigue testing, an improved specimen geometry has been developed. The results show a significant decrease in fatigue life for saturated GFRP specimens. In contrast, a water absorption of 50% of the maximum content showed no impact. This is especially remarkable because static material properties immediately decrease with the onset of moisture absorption. To identify the water absorption induced damage progress, light and scanning electron microscopy was used. As a result, the formation of debondings and cracks in the fibre–matrix interphase was detected in long-term conditioned specimens, although no mechanical loading was applied. Full article
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