Reinforcement/matrix bond - Definition and characterization

Heterogeneous, essentially two-phase materials, consisting of a polymer matrix reinforced with fibers or fillers, composites offer highly attractive mechanical and physical properties that depend on those of their basic constituents (reinforcement and matrix). However, experience shows that the nature and quality of the bond between reinforcement and matrix, known as the interface or interphase, also play an essential role in defining the characteristics of these materials, even if the mechanisms involved at this level remain relatively delicate to master. The problem lies in the fact that the notion of interface is relatively vague, that the interfacial zone does not exist per se but is only formed during the manufacture of the composite part, and that it is therefore difficult to attribute a set of specific characteristics to it.

Consequently, the aim of the first part of this dossier is to highlight the complexity of the reinforcement/matrix bond structure and the industrial importance of controlling it [AM 5 305, § 1 ]. We then examine the contribution of the various experimental characterization methods available to analyze the interfacial zone [AM 5 305, § 2 ]. In a second section, we'll look at the various ways in which its contribution can be incorporated into models of composite behavior. . The third part of this will use various examples to illustrate the influence of reinforcement/matrix bonding on the behavior of industrial composites. Bibliographical references can be found in .