PSI - Issue 53

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Alessandro Greco et al. / Procedia Structural Integrity 53 (2024) 178–184 Author name / Structural Integrity Procedia 00 (2019) 000–000

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4. Conclusions This study deals with an experimental investigation on the tensile properties of PEEK fabricated using FFF technology. Three key factors were considered as main contributors potentially affecting the mechanical properties: layer height, infill pattern and annealing as post-process treatment. The results showed that the infill pattern affected the tensile properties much more than the layer height. Indeed, the best performance was achieved by specimens characterized by rectilinear infill (  45 deg raster angle), providing performances very close to the performance of molded peek. Moreover, annealing post-treatments were performed on the series characterized by triangular infill pattern. In this case, the results indicated that annealing did not improve the tensile performances of the material. This is not consistent with literature, hence further investigations are currently under development. As a future activity, additional infill patterns will be investigated and an extensive campaign aimed at studying the fatigue behavior of the material will be made. Acknowledgements This research is supported by the project TOTEM (ML-based predicTive mOdel for besT pErforMance of AM parts) at the University of Campania Luigi Vanvitelli (IT). References ASTM D638 Standard Test Method for Tensile Properties of Plastics, 2022. Citarella, R., Giannella, V., 2021. Additive Manufacturing in Industry. Applied Sciences 11, 840. D’Amore, A., Dell’Aversano, R., Califano, A., 2019. Preliminary approach to the study of flexural fatigue behavior of low Tg carbon/epoxy laminates. AIP Conference Proceedings 2196, 020042. Grassia, L., Iannone, M., Califano, A., D'Amore, A., 2018. Self-learning health monitoring algorithm in composite structures. AIP Conference Proceedings 1932, 030011. Grassia, L., Iannone, M., Califano, A., D’Amore, A., 2019. Strain based method for monitoring the health state of composite structures. Composites B 176, 107253. He, Y., Shen, M., Wang, Q., Wang, T., Pei, X., 2023, Effects of FDM parameters and annealing on the mechanical and tribological properties of PEEK. Composite structures 313, 116901. Mylläri, V., Ruoko, T.P.,Vuorinen, J., Lemmetyinen, H., 2015 Characterization of thermally aged polyetheretherketone fibres – mechanical, thermal, rheological and chemical property changes. Polymer Degradation and Stability 120. Pulipaka, A.,Gide, K.M., Beheshti, A.Bagheri, Z., 2023. Effect of 3D printing process parameters on surface and mechanical properties of FFF printed PEEK. Journal of Manufacturing Processes 85. Stepashkin, A.A., Chukov, D.I., Senatov, F.S., Salimon, A.I., Krotsunsky, A.M., 2018. 3D- printed PEEK-carbon fiber (CF) composites: structure and thermal properties. Composites Science and Technology 164, 319-326. Wu, W., Geng, P., Li, G., Zhao, D., Zhang, H., Zhao, J., 2015. Influence of Layer Thickness and Raster Angle on the Mechanical Properties of 3D Printed PEEK and a Comparative Mechanical Study between PEEK and ABS. Materials 8, 5834-5846. Zhen, H., Zhao, B., Quan, L., Fu, J., 2023. Effect of 3D Printing Process Parameters and Heat Treatment Conditions on the Mechanical Properties and Microstructure of PEEK Parts. Polymers 15, 2209.