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 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.

Highlights

  • The fiber dominated tensile strength of a composite material is an important design parameter

  • The authors of this paper studied the dissolution of glass fibers in distilled water

  • The test results for bundles from carbon and glass fibers in water and toluene are summarized in

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Summary

Introduction

The fiber dominated tensile strength of a composite material is an important design parameter. It is typically measured on unidirectional laminates [1,2] or it can be back calculated from cross-plied or other laminate configurations. Back calculation first requires calculation of the UD elastic constants from the laminate performance [3]. A failure criterion needs to be applied [4,5]. A simple approach to obtain the strength assumes the strain to failure of the fibers does not change, combined with the maximum strain criterion. The data is typically well known for the common fiber-matrix combinations

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