PSI - Issue 41

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Sci nceDirect Structural Integrity Procedia 00 (2022) 000–000 Available online at www.sciencedirect.com Procedia Structural Integrity 41 (2022) 638–645

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

© 2022 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 MedFract2Guest Editors. Abstract Fused filament fabrication (FFF) also referred to as fused deposition modeling (FDM) is the most extensively used among all the additive manufacturing (AM) technologies due to its low cost, ease of use and variety of materials commercially available. An FFF printer generates a 3-dimensional object by extruding a stream of heated and semi-melted thermoplastic material, which is deposited onto layer upon layer, working from the bottom up. The literature study reveals that primary attributes of FFF parts like surface texture, mechanical strength, surface roughness, and dimensional accuracy depend on crucial process-related parameters and, therefore, should be set appropriately. This study focuses on the effects of several FFF parameters on the ultimate tensile strength (UTS) of a 3D-printed organic, biocompatible PLA with wood flour. Taguchi’s design involving orthogonal array experiments runs was applied to fabricate the test specimens (according to ASTM D638-10 type I one) and obtain the results corresponding to stress-strain curves and the ultimate tensile strength (UTS). The independent FFF parameters examined are layer thickness (LT), nozzle temperature (NT), raster deposition angle (RDA) and printing speed (PS). The results obtained are further analyzed by implementing standard statistical analyses like contour plots emphasizing 2-way interactions and analysis of variance. Full quadratic models were obtained and proved of high accuracy in terms of predicting the results for the response of UTS. The sta istical results are suppo ted with micrographs of failure sections and validated by comparing them with previous stud es performed on pur PLA material. Moreover, valua ion exp rim nts were pe form d to validate the results. 2nd Mediterranean Conference on Fracture and Structural Integrity Experimental and statistical study on the effects of fused filament fabrication parameters on the tensile strength of hybrid PLA/Wood fabricated parts N.A. Fountas a , J.D. Kech gias b , S.P. Zaou os c , N.M. Vaxevanidis a * a Department of Mechanical Engineering Educators, School of Pedagogical and Technological Education (ASPETE), Amarousion, GR 15122, Greece b Design and Manufacturing Laboratory (DML), University of Thessaly, Karditsa, GR 43100, Greece c Department of Energy ystems, University of Thessaly, Larissa, GR 41500, Greece Abstract Fused filament fabrication (FFF) also referred to as fused deposition modeling (FDM) is the most extensively used among all the additive manufacturing (AM) technologies due to its low cost, ease of use and variety of materials commercially available. An FFF printer generates a 3-dimensional object by extruding a stream of heated and semi-melted thermoplastic material, which is deposited onto layer upon layer, working from the bottom up. The literature study reveals that primary attributes of FFF parts like surface texture, mechanical strength, surface roughness, and dimensional accuracy depend on crucial process-related parameters and, therefore, should be set appropriately. This study focuses on the effects of several FFF parameters on the ultimate tensile strength (UTS) of a 3D-printed organic, biocompatible PLA with wood flour. Taguchi’s design involving orthogonal array experiments runs was applied to fabricate the test specimens (according to ASTM D638-10 type I one) and obtain the results corresponding to stress-strain curves and the ultimate tensile strength (UTS). The independent FFF parameters examined are layer thickness (LT), nozzle temperature (NT), raster deposition angle (RDA) and printing speed (PS). The results obtained are further analyzed by implementing standard statistical analyses like contour plots emphasizing 2-way interactions and analysis of variance. Full quadratic models were obtained and proved of high accuracy in terms of predicting the results for the response of UTS. The statistical results are supported with micrographs of failure sections and validated by comparing them with previous studies performed on pure PLA material. Moreover, evaluation experiments were performed to validate the results. 2nd Mediterranean Conference on Fracture and Structural Integrity Experimental and statistical study on the effects of fused filament fabrication parameters on the tensile strength of hybrid PLA/Wood fabricated parts N.A. Fountas a , J.D. Kechagias b , S.P. Zaoutsos c , N.M. Vaxevanidis a * a Department of Mechanical Engineering Educators, School of Pedagogical and Technological Education (ASPETE), Amarousion, GR 15122, Greece b Design and Manufacturing Laboratory (DML), University of Thessaly, Karditsa, GR 43100, Greece c Department of Energy Systems, University of Thessaly, Larissa, GR 41500, Greece

* Corresponding author. Tel.: +30 210 2896841. E-mail address: vaxev@aspete.gr * Corresponding author. Tel.: +30 210 2896841. E-mail address: vaxev@aspete.gr

2452-3216 © 2022 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 MedFract2Guest Editors. 10.1016/j.prostr.2022.05.072 2452-3216 © 2022 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 MedFract2Guest Editors. 2452-3216 © 2022 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 MedFract2Guest Editors.