Élaboration et caractérisation d’une résine époxy biosourcée renforcée de fibres longues : de la fibre de carbone à celles de lin et de basalte

Long fiber-reinforced epoxy composites are widely used in many sectors such as automotive and aerospace due to their mechanical properties and light weight. Recently, new epoxy resins described as bio-sourced have entered the market. Significant attention is given to them because of their reduced impact on the environment compared to petroleum-based resins. This work focuses on the development and mechanical characterization of flax, basalt or carbon fiber laminates designed with a 38% biosourced thermosetting resin by the hand lay-up manufacturing method. They have 4, 8 ou 12 layers. The fabrics used as reinforcements were 2 × 2 twill weaves for flax and basalt and satin 5 for carbon. The mechanical behavior of these composites was studied through numerous mechanical tests such as uniaxial tensile, compression with combined loading, 3-point bending, apparent interlaminar shear strength (ILSS), in-plane shear and Vickers hardness by micro-indentation. The flax and basalt yarns used in the textile reinforcements, as well as the elementary fibers and filaments composing them, were also characterized by tensile tests. The results showed that the hand lay-up manufacturing technique gave a good reproducibility of the stress-strain curves when the tests are not very sensitive to the laminate elaboration parameters. However, due to some difficulties encountered during the cutting of the specimens, and the resulting damage, the properties obtained must be taken with caution. This work provides preliminary data and constitutes a first step in the development of partially biosourced composite materials at UCLouvain.