Abstract
The concept of adhesional pressure was proposed to characterise the interfacial bond strength in fibre–matrix systems. The adhesional pressure is the interfacial normal stress produced by the molecular interaction between the fibre surface and the matrix. Using the variational mechanics approach, we calculated the critical normal stress, at which debonding starts in the pull-out and microbond tests. This critical value can be used as a failure criterion. The relationship between “fundamental” (WA) and “practical” (adhesional pressure) adhesion was investigated. The adhesional pressure appeared to linearly depend on the work of adhesion from the IGC data. This allows to estimate WA from destructive micromechanical tests. An important advantage of the proposed approach is that it can characterise adhesion for real conditions of the composite formation, including irreversible adhesion.
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