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Bonding polymer Composites with PEI film: crack trapping and enhanced fracture resitstance

par Van Innis, Charline ;Ballout, Wael;Bailly, Christian;Pardoen, Thomas
Référence Les Assemblages mécaniques - Evolutions récentes et perspectives
Publication Publié, 2021-07-01

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Résumé :

Fiber reinforced polymer (FRP) composites offer many advantages such as lightweight and high strength motivating their intensive use in aircrafts. However, the manufacturing of complex composite parts often requires bonding composite parts in an efficient way [1]. Adhesives can be used, but with low to moderate toughness [2] and difficulties to develop integrated manufacturing approaches. Several strategies have been proposed to increase the joint toughness. One option is replacing the adhesive by a thermoplastic film, but which necessitates a tough thermoplastic-thermoset interphase. Recently, Voleppe et al. observed an enhanced fracture resistance of thermoplastic/thermoset interfaces owing to a crack trapping mechanism in a morphological gradient when inserting a PEI film in the epoxy resin RTM6 [3]. The interface is characterized by a fracture toughness equal to 800J/m², similar to that of good structural adhesives for composite bonding, while the one of the epoxy resin is only about 100 J/m². The crack is trapped between the PEI film and a co-continuous morphology (Figure 1). The goal of the current research is to apply this concept to composite bonding and to better understand this toughening mechanism.