Research into the Possibility of Improving Properties of Carbon Fibers at Compression and Shear by Stitching Carbon Preforms with Aramid Threads

In this work, the technological capabilities of stitching a dry preform of carbon fabrics before impregnation with epoxy resin is investigated. Two types of high-modulus aramid yarn – Armalon and Aramos – with linear density of 7.9 and 60 tex respectively are used. Reinforcement patterns, from the unidirectional to the quasi-isotropic one, are investigated. Using the obtained samples of carbon fibre with the thickness of up to 5 mm, strength at compression for various layup patterns, shear strength and impact strength are determined. A qualitative comparison of the modulus of elasticity for stitched and non-stitched samples is performed. It is shown that stitching by high-modulus threads is possible and does not hinder the movement of resin at the infusion. The shear strength increased by 30% but only when threads of linear density of 60 tex were used. It shows that even such a prominent thread in the structure (approximately 0.1 mm after curing) did not become a significant defect. The impact strength did not change, while the failure resistance and modulus of elasticity at compression showed a tendency to grow in values.

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