PSI - Issue 53

P.N.B. Reis et al. / Procedia Structural Integrity 53 (2024) 309–314 P.N.B. Reis / Structural Integrity Procedia 00 (2019) 000–000

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In this test, it should be noted that the first load cycle is similar to the response of a monotonic tensile test. Therefore, viscoplasticity predominates during the initial load cycles, where the majority of the inelastic deformation accumulates, and viscoelasticity predominates during the subsequent load cycles. 4. Conclusions The mechanical response of a composite reinforced with short carbon fibres and graphene subjected to monotonic tensile tests was evaluated, as well as at cyclic tests with constant load-unload and repeated progressive load-unload. From the monotonic tensile test, it was possible to observe the existence of bilinear behaviour, characterized by a specific tensile modulus ( E 1 and E 2 ). The values found for E 1 and E 2 were 17.15 GPa and 10.45 GPa, respectively. The repeated progressive load-unload tests showed the existence of an accumulation of inelastic strain, while the constant load amplitude cyclic tests showed that this inelastic strain accumulates during the first loading cycles. Acknowledgements This research was sponsored by national funds through FCT—Fundação para a Ciência e a Tecnologia, under the project UIDB/00285/2020 and LA/P/0112/2020.c References Behalek, L., Safka, J., Seidl, M., Habr, J., Bobek, J., 2018. Fused deposition modelling vs. Injection moulding: Influence of fiber orientation and layer thickness on the mechanical properties. MM Sci. J., 12, pp. 2722–2726. Ferreira, J.A.M., Reis, P.N.B., Costa, J.D.M., Richardson M.O.W., 2012. Fatigue behaviour of Kevlar composites with nanoclay-filled epoxy resin. J. Compos. Mater., 47(5), pp. 1885–1895. Gao, X., Zhang, D., Qi, S., Wen, X., Su, Y., 2019. Mechanical properties of 3D parts fabricated by fused deposition modeling: Effect of various fillers in polylactide. J. Appl. Polym. Sci., 136(31), pp. 47824, ISO/ASTM 52900:2015. Additive manufacturing-General principles-Terminology. ISO/ASTM International 2015. Reis, P.N.B., Ferreira, J.A.M., Richardson, M.O.W., 2011. Fatigue Damage Characterization by NDT in Polypropylene/Glass Fibre Composites. Appl. Compos. Mater., 18, pp. 409-419. Spoerk, M., Arbeiter, F., Cajner, H., Sapkota, J., Holzer, C., 2017. Parametric optimization of intra- and inter-layer strengths in parts produced by extrusion-based additive manufacturing of poly(lactic acid). J. Appl. Polym. Sci., 134 (41), pp. 45401. Vilaseca F, Del Rey, R., Serrat, R., Alba, J., Mutje, P., Espinach, F.X., 2018. Macro and micro-mechanics behavior of stifness in alkaline treated hemp core fibres polypropylene-based composites. Compos. B: Eng., 144, pp. 118-125. Ziemian, C., Sharma, M., Ziemi, S., 2012. Anisotropic Mechanical Properties of ABS Parts Fabricated by Fused Deposition Modelling. in “ Mechanical Engineering ”. In: GoKçek M. (Ed.). IntechOpem, Rijeka- Croatia, pp. 159.

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