PSI - Issue 51

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ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 51 (2023) 160–165

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0 ) Peer-review under responsibility of the scientific committee of the ICSID 2022 Organizers Abstract In the case of 3D printing of polymer matrix composites, the most widespread material is nylon. Improper storage of nylon results in moisture absorption, which in the case of Fused Filament Fabrication affects the print quality due to uncontrolled deposition of the material into the structure. The uncontrolled deposition results in printing imperfections which the authors faced during the preparation process of specimens for the articles. The imperfections negatively affect the resulting mechanical properties. It has been shown that modification of the nozzle temperature is one of the options which could solve the issue of improperly stored materials printing. The specimens did not report any apparent printing defects. However, the modification of the nozzle temperature affects the joint quality between the individual laminas. The results showed that the quality improved heating of the printing bed. To identify the effect of the printing parameters modifications, the authors carried out a tensile test to compare the tensile properties of a) specimens printed from properly stored material at default printing parameters and b) specimens printed from improperly stored material with modified printing parameters. According to the results, these series reported different fracture patterns. On the other hand, the tensile strength values were comparable. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSID 2022 Organizers Keywords: Additive manufacturing; moisture; nylon; nozzle temperature 1. Introduction Additive technology is a manufacturing process based on layering material. In the beginning, the possibilities of the technology were quite limited, which made it possible to print only thermoplastics. The main benefit has been the Abstract In the case of 3D printing of polymer matrix composites, the most widespread material is nylon. Improper storage of nylon results in moisture absorption, which in the case of Fused Filament Fabrication affects the print quality due to uncontrolled deposition of the material into the structure. The uncontrolled deposition results in printing imperfections which the authors faced during the preparation process of specimens for the articles. The imperfections negatively affect the resulting mechanical properties. It has been shown that modification of the nozzle temperature is one of the options which could solve the issue of improperly stored materials printing. The specimens did not report any apparent printing defects. However, the modification of the nozzle temperature affects the joint quality between the individual laminas. The results showed that the quality improved heating of the printing bed. To identify the effect of the printing parameters modifications, the authors carried out a tensile test to compare the tensile properties of a) specimens printed from properly stored material at default printing parameters and b) specimens printed from improperly stored material with modified printing parameters. According to the results, these series reported different fracture patterns. On the other hand, the tensile strength values were comparable. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSID 2022 Organizers Keywords: Additive manufacturing; moisture; nylon; nozzle temperature 1. Introduction Additive technology is a manufacturing process based on layering material. In the beginning, the possibilities of the technology were quite limited, which made it possible to print only thermoplastics. The main benefit has been the 6th International Conference on Structural Integrity and Durability (ICSID 2022) Effect of printing parameters on the tensile properties of improperly stored chopped carbon fibres reinforced nylon 6th International Conference on Structural Integrity and Durability (ICSID 2022) Effect of printing parameters on the tensile properties of improperly stored chopped carbon fibres reinforced nylon J. Majko a *, M. Vaško a , M. Handrik a , M. Gavlas a , F. Nový a a University of Žilina, Faculty of Mech. Eng., Univerzitná 8215/1, 010 26 Žilina, Slovakia J. Majko a *, M. Vaško a , M. Handrik a , M. Gavlas a , F. Nový a a University of Žilina, Faculty of Mech. Eng., Univerzitná 8215/1, 010 26 Žilina, Slovakia

* Corresponding author. Tel.: +421-41-513-2965. E-mail address: jaroslav.majko@fstroj.uniza.sk * Corresponding author. Tel.: +421-41-513-2965. E-mail address: jaroslav.majko@fstroj.uniza.sk

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSID 2022 Organizers 2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the ICSID 2022 Organizers

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