Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics
1
Department of Mechanical and Industrial Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
2
SINTEF Industry, Department Materials and Nanotechnology, 0314 Oslo, Norway
3
Institute of Polymer Composites, Hamburg University of Technology (TUHH), D-21073 Hamburg, Germany
*
Author to whom correspondence should be addressed.
†
Authors had a similar degree of contribution (see contribution).
Fibers 2019, 7(12), 107; https://doi.org/10.3390/fib7120107
Received: 17 October 2019 / Revised: 20 November 2019 / Accepted: 4 December 2019 / Published: 6 December 2019
(This article belongs to the Special Issue Durabillity of Fibre to Polymer Adhesion: Interfacial Strength in FRPs)
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.
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Keywords:
glass fibers; carbon fibers; zero stress; environmental; aging; model; dissolution; kinetics; water; oil; strength
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MDPI and ACS Style
Echtermeyer, A.T.; Krauklis, A.E.; Gagani, A.I.; Sæter, E. Zero Stress Aging of Glass and Carbon Fibers in Water and Oil—Strength Reduction Explained by Dissolution Kinetics. Fibers 2019, 7, 107.
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