RT info:eu-repo/semantics/article T1 The essential work of fracture parameters for 3D printed polymer sheets A1 Cuesta Segura, Isidoro Iván A1 Martínez Pañeda, Emilio A1 Díaz Portugal, Andrés A1 Alegre Calderón, Jesús Manuel K1 Essential Work of Fracture K1 Deeply double-edge notched tensile specimen K1 Small punch test K1 Fused deposition modelling K1 3D printed polymer sheet K1 Resistencia de materiales K1 Strength of materials AB Additive manufacturing is becoming increasingly popular in academia and industry. Accordingly, there has been a growing interest in characterizing 3D printed samples to determine their structural integrity behaviour. We employ the Essential Work of Fracture (EWF) to investigate the mechanical response of polymer sheets obtained through additive manufacturing. Our goal is twofold; first, we aim at gaining insight into the role of fibre reinforcement on the fracture resistance of additively manufactured polymer sheets. Deeply double-edge notched tensile (DDEN-T) tests are conducted on four different polymers: Onyx, a crystalline, nylon-reinforced polymer, and three standard polymers used in additive manufacturing – PLA, PP and ABS. Results show that fibre-reinforcement translates into a notable increase in fracture resistance, with the fracture energy of Onyx being an order of magnitude higher than that reported for non-reinforced polymers. On the other hand, we propose the use of a miniature test specimen, the deeply double-edge notched small punch specimens (DDEN-SP), to characterize the mechanical response using a limited amount of material. The results obtained exhibit good alignment with the DDEN-T data, suggesting the suitability of the DDEN-SP test for measuring fracture properties of additively manufactured polymers in a cost-effective manner. PB Elsevier SN 0264-1275 YR 2019 FD 2019-11 LK http://hdl.handle.net/10259/5665 UL http://hdl.handle.net/10259/5665 LA eng NO Ministry of Education, Government of Castile-Leon, which started in 2018 under the support of the Recognized Research Groups of the Public Universities of Castile and Leon (project: BU033G18) DS Repositorio Institucional de la Universidad de Burgos RD 23-nov-2024