Abstract
We present new theoretical and experimental results which demonstrate that the degree of fiber-matrix bonding can be quantified by means of the interface energy for the initiation of debonding, rather than by using a stress-based interfacial parameter. A one-dimensional model for the energy necessary to initiate/nucleate an interfacial crack from its associated transverse fiber break during a single fiber fragmentation test is proposed. The interface energy for the initiation of debonding is shown to be a function of the fiber and matrix geometrical and material characteristics, and of the initial debonding length. The validity of the approach is demonstrated in the case of fragmentation of sized and unsized E-glass fibers embedded in an UV-cured polymeric matrix.
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Wagner, H.D., Nairn, J.A. & Detassis, M. Toughness of interfaces from initial fiber-matrix debonding in a single fiber composite fragmentation test. Appl Compos Mater 2, 107–117 (1995). https://doi.org/10.1007/BF00569253
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DOI: https://doi.org/10.1007/BF00569253