PSI - Issue 66

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2025) 000–000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 66 (2024) 449–458

8th International Conference on Crack Paths Thermography based approach for the rapid assessment of damage in PA12 obtained by Multijet-Fusion printing technology Davide D’Andrea*, Davide Crisafulli, Giacomo Risitano, Dario Santonocito Department of Engineering – University of Messina, Contrada di Dio Sant’Agata, 98166, Messina Iitaly) Abstract Additive manufacturing (AM) allows the creation of structural components adopting several printing strategies. Between them, MultiJet-Fusion (MJF) is one of the most recent AM technologies on the market, offering fast, economical and large production, at the same time, of functional parts which can undergo to several loading conditions, include fatigue. As the final functional parts may have even complex geometries, it is of fundamental importance to rapidly assess the fatigue limit and the SN curve of the material, to allow a proper fatigue design of the components. Under fatigue load conditions, the Polyammide-12 (PA12) has proven to dissipate the mechanical energy into heat and increase its temperature. According to the Thermographic Methods, the temperature can be adopted as a damage index for the material. In the present work, PA12 obtained by MJF technology were tested and monitored with an infrared camera to assess the initiation of damage within the material due to its peculiar internal microstructure, and to accelerate the testing time, in order to provide reliable data for the mechanical design of components. © 2025 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 CP 2024 Organizers Keywords: energy dissipation; infrared thermography; fatigue; accelerated testing. 1. Introduction Additive Manufacturing (AM) technologies allows designers to use complex geometries in their project just by creating a CAD of the desired product and a large variety of materials. Nowadays powder-based manufacturing processes have been improved with the introduction of MultiJet Fusion (MJF) process by HP. By doing so, 3D printing © 2025 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 CP 2024 Organizers

* Corresponding author. E-mail address: davide.dandrea@studenti.unime.it

2452-3216 © 2025 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 CP 2024 Organizers

2452-3216 © 2025 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 CP 2024 Organizers 10.1016/j.prostr.2024.11.097