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Analysis of fracture toughness in mode II and fractographic study of composites based on Elium® 150 thermoplastic matrix

2019; Elsevier BV; Volume: 175; Linguagem: Inglês

10.1016/j.compositesb.2019.107082

1879-1069

Lorena Cristina Miranda Barbosa, Daniel Brighenti Bortoluzzi, Antônio Carlos Ancelotti,

Epoxy Resin Curing Processes

One of the major challenges of composite materials is to increase their properties related to interlaminar fracture toughness and consequently delamination. This work shows a composite system based on a new thermoplastic Elium® 150 resin developed to be a competitive solution for the composites traditionally based on epoxy resins. Both composites were fabricated via VARTM using a 0/90° plain weave carbon fiber fabric. The thermoplastic composites presented 40% more resistance to interlaminar fracture in comparison to epoxy composites. These materials obtained superior performance in crack propagation resistance because it tends to absorb the energy associated with crack propagation in the form of plastic deformation. The unknown fractographic aspects of the fracture surfaces of the thermoplastic laminate was used as a complementary tool for the mechanical characterization. In this case, it was evidenced the presence of morphological features characteristic of pure mode II shear failure characterized by a failure directly in the interfacial fiber/matrix regions and shear cusps which are similar to the known aspects already observed in epoxy resin based matrices.