PSI - Issue 39

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Procedia Structural Integrity 39 (2022) 801–807

7th International Conference on Crack Paths Mixed modes crack paths in SCB specimens obtained via SLS Liviu Marsavina a , Dan Ioan Stoia a *, Emanoil Linul a 7th International Conference on Crack Paths Mixed modes crack paths in SCB specimens obtained via SLS Liviu Marsavina a , Dan Ioan Stoia a *, Emanoil Linul a

a Department of Mechanics and Strength of materials, University Politehnica Timisoara, Blvd. M. Viteazul, No. 1, 300222 Timisoara, Romania a Department of Mechanics and Strength of materials, University Politehnica Timisoara, Blvd. M. Viteazul, No. 1, 300222 Timisoara, Romania

© 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 CP 2021 – Guest Editors © 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 CP 2021 – Guest Editors Abstract The p per presents exp rimental r sults of the crack path in S mi-Circular Bend (SCB) specimens obtained through additive manufacturi g using Selective Laser Sintering (SLS) process. D terminatio of fracture param ters for co pone ts obtain d via Additive manufacturing is a challenging topic, due to the influenc of manufacturing parameters on the mechanical p operties. Several re earches provided the fracture toughne s of SLS components, how ver there are not yet available results regarding the cr ck pa hs in such materials. The SCB specimens were designed with different crack ori ntations (0 ° , 15 ° , 30 ° , 45 ° , and 54 ° ) and manufact red using EOS Formiga – SLS quipment (energy e sit 0.066 J/mm2, chamber temperature 169.5 °C, layer thickness 0.1 mm) using PA22 0 material. The specimens were t sted in symmetric three point bending con iguration, creating 6 mod mixity fro ode I (0 ° – crack orientation) t pur mode II (54 ° – crack orientation). Tests were performed at room tempera ure using 2 mm/min loading speed in a Zwick ProLin Z005 t sting achine. For each crack orientatio five specime s w r tested. Crack i itia ion angle and crack pr pagation were meas r d by image digitization after the mechanical tes ing nd present d in acco dance to the ini ial o i ntation of the crack. Also, numerical simulation of crack path was conducted in the same way like the experiment and results were compared to the measured one. © 2021 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of CP 2021 – Guest Editors Abstract The paper presents experimental results of the crack path in Semi-Circular Bend (SCB) specimens obtained through additive manufacturing using Selective Laser Sintering (SLS) process. Determination of fracture parameters for components obtained via Additive manufacturing is a challenging topic, due to the influence of manufacturing parameters on the mechanical properties. Several researches provided the fracture toughness of SLS components, however there are not yet available results regarding the crack paths in such materials. The SCB specimens were designed with different crack orientations (0 ° , 15 ° , 30 ° , 45 ° , and 54 ° ) and manufactured using EOS Formiga – SLS equipment (energy density 0.066 J/mm2, chamber temperature 169.5 °C, layer thickness 0.1 mm) using PA2200 material. The specimens were tested in symmetric three point bending configuration, creating 6 mode mixity from mode I (0 ° – crack orientation) to pure mode II (54 ° – crack orientation). Tests were performed at room temperature using 2 mm/min loading speed in a Zwick ProLine Z005 testing machine. For each crack orientation five specimens were tested. Crack initiation angle and crack propagation were measured by image digitization after the mechanical testing and presented in accordance to the initial orientation of the crack. Also, numerical simulation of crack path was conducted in the same way like the experiment and results were compared to the measured one.

Keywords: selective laser sintering, polyamide, crack initiation angle, crack path; Keywords: selective laser sintering, polyamide, crack initiation angle, crack path;

* Corresponding author. E-mail address: liviu.marsavina@upt.ro * Correspon ing author. E-mail address: liviu.marsavina@upt.ro

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 CP 2021 – Guest Editors 2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an ope acces article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of CP 2021 – Guest Editors

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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.153