PSI - Issue 31

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ScienceDirect

Procedia Structural Integrity 31 (2021) 105–110 Procedia Structural Integrity 00 (2020) 000–000 Procedia Structural Integrity 00 (2020) 000–000

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4th International Conference on Structural Integrity and Durability, ICSID 2020 Fracture behavior of intact and defected 3D-printed parts Mohammad Reza Khosravani ∗ , Tamara Reinicke Chair of Product Development, University of Siegen, Paul-Bonatz-Str. 9-11, 57068 Siegen, Germany 4th International Conference on Structural Integrity and Durability, ICSID 2020 Fracture behavior of intact and defected 3D-printed parts Mohammad Reza Khosravani ∗ , Tamara Reinicke Chair of Product Development, University of Siegen, Paul-Bonatz-Str. 9-11, 57068 Siegen, Germany

© 2021 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 ICSID 2020 Organizers. Abstract Additive manufacturing (AM) is a highly innovative technology with advantages over conventional manufacturing processes. AM also known as three-dimensional (3D) printing is a set of manufacturing methods which can be used to produce functional end-use products from 3D solid models. Since 3D-printed components have been used as spare parts and final products, their structural performance become an important issue. The present work aims to determine influence of fabrication defect on structural performance and fracture behavior of 3D-printed parts. To this aim, polylactic acid material was used to print specimens based on fused deposition modeling process. These polymeric specimens were printed with two di ff erent raster directions. Moreover, the 3D-printed specimens were subjected to accelerated thermal ageing tests. In this study, a series of tensile tests was conducted on unaged and aged test coupons to determine influence of this thermal ageing on the mechanical behavior of the examined parts. This study sheds light on durability of additively manufactured parts. c 2021 The Authors. Published by Elsevier B.V. is is an open access article under the CC BY-NC-ND license (http: // cr ativec mmons.org / licenses / by-nc-nd / 4.0 / ) r-review unde responsibility of CSID 2020 Organizers. Keywords: Additive manufacturing; defect; thermal ageing; fracture behavior; tensile strength. Abstract Additive manufacturing (AM) is a highly innovative technology with advantages over conventional manufacturing processes. AM also known as three-dimensional (3D) printing is a set of manufacturing methods which can be used to produce functional end-use products from 3D solid models. Since 3D-printed components have been used as spare parts and final products, their structural performance become an important issue. The present work aims to determine influence of fabrication defect on structural performance and fracture behavior of 3D-printed parts. To this aim, polylactic acid material was used to print specimens based on fused deposition modeling process. These polymeric specimens were printed with two di ff erent raster directions. Moreover, the 3D-printed specimens were subjected to accelerated thermal ageing tests. In this study, a series of tensile tests was conducted on unaged and aged test coupons to determine influence of this thermal ageing on the mechanical behavior of the examined parts. This study sheds light on durability of additively manufactured parts. c 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of ICSID 2020 Organizers. Keywords: Additive manufacturing; defect; thermal ageing; fracture behavior; tensile strength. Di ff erent manufacturing technologies have been developed to produce structural components with desired proper ties. Indeed, new manufacturing processes were developed during the previous industrial revolutions, which are more e ffi cient and rapid than the traditional processes (Efe and Isik, 2020). Additive manufacturing (AM) also known as three-dimensional (3D) printing is a manufacturing process in a layer–by-layer fashion irrespective of any shape and size (Leary, 2019). In this manufacturing process, various materials have been used. For instance, ceramics, metals, polymers, aluminum alloys, and titanium have been utilized in di ff erent 3D printing processes (Kong et al., 2018; Zhao et al., 2019; Zolfagharian et al., 2020). Based on the American Society for Testing and Materials (ASTM), 3D printing techniques have been classified into seven fundamental processing methods: binder jetting, material extrusion, directed energy deposition, material jetting, sheet lamination, powder bed fusion, and vat photopolymerization (ASTM F2792, 2012). As product complexity has been increased in di ff erent industries, 3D printing has attracted interest particularly Di ff erent manufacturing technologies have been developed to produce structural components with desired proper ties. Indeed, new manufacturing processes were developed during the previous industrial revolutions, which are more e ffi cient and rapid than the traditional processes (Efe and Isik, 2020). Additive manufacturing (AM) also known as three-dimensional (3D) printing is a manufacturing process in a layer–by-layer fashion irrespective of any shape and size (Leary, 2019). In this manufacturing process, various materials have been used. For instance, ceramics, metals, polymers, aluminum alloys, and titanium have been utilized in di ff erent 3D printing processes (Kong et al., 2018; Zhao et al., 2019; Zolfagharian et al., 2020). Based on the American Society for Testing and Materials (ASTM), 3D printing techniques have been classified into seven fundamental processing methods: binder jetting, material extrusion, directed energy deposition, material jetting, sheet lamination, powder bed fusion, and vat photopolymerization (ASTM F2792, 2012). As product complexity has been increased in di ff erent industries, 3D printing has attracted interest particularly 1. Introduction 1. Introduction

2452-3216 © 2021 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 ICSID 2020 Organizers. 10.1016/j.prostr.2021.03.017 ∗ Corresponding author. Tel.: + 49(0271)-740-2863 E-mail address: mohammadreza.khosravani@uni-siegen.de 2210-7843 c 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of ICSID 2020 Organizers. ∗ Corresponding author. Tel.: + 49(0271)-740-2863 E-mail address: mohammadreza.khosravani@uni-siegen.de 2210-7843 c 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http: // creativecommons.org / licenses / by-nc-nd / 4.0 / ) Peer-review under responsibility of ICSID 2020 Organizers.