PSI - Issue 68

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 68 (2025) 746–755

European Conference on Fracture 2024 Mechanical characterization of Nylon CF printed by FDM process by using energy methods Danilo D’Andrea a, *, Giacomo Risitano a , Pasqualino Corigliano a , Dario Santonocito a , Davide D’Andrea a a Department of Engineering - University of Messina, Contrada di Dio, 98166 Messina (Italy) Abstract Additive manufacturing (AM) is a production process that allows the creation of customizable devices which could satisfy modern industry requirements. The aim of this work is to study the mechanical behaviour of PA12 filament reinforced with 15% of carbon fibres, obtained by Fused Deposition Modelling (FDM) process, to evaluate the influence of 3D printing machine on material behaviour, and to estimate fatigue limit through energy methods. Mechanical characterization tests were performed using an innovative testing machine, patented by University of Messina’s academic spin-off Knowow and designed in collaboration with ItalSigma srl., called Rapid Fatigue Machine (RFM) crafted to use IR thermography and DIC analysis on the specimen. Results demonstrate that the stress limit estimated by Static Thermographic Method is related with fatigue limit estimated by Risitano’s Thermographic Method. The results reveal a good approximation between the fatigue behaviour studied with energetic methods and the fatigue life determined with classical methods. © 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 ECF24 organizers Keywords: Additive Manufacturing, Nylon CF, Composite, Fatigue, Energy Methods © 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 ECF24 organizers

* Corresponding author. Tel.: +39 90 676 5540. E-mail address: dandread@unime.it 1. Introduction

Polymers represent one of the great innovations in the field of materials in recent decades. Thanks to their low price and ease of manufacturing, polymers have become fundamental in the use of innovative production techniques such as additive manufacturing. Thanks to their versatility and different chemical compositions, polymers are used in many industrial sectors such as medical devices (Türk et al. 2018; Sakib-Uz-Zaman and Khondoker 2023; Puppi and

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 ECF24 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 ECF24 organizers 10.1016/j.prostr.2025.06.125