PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 tr t r l I t rit r i ( ) Available online at www.sciencedirect.com ^ĐŝĞŶĐĞ ŝƌĞĐƚ il l li t . i i t.

www.elsevier.com/locate/procedia . l i r. /l t / r i

ScienceDirect

Procedia Structural Integrity 42 (2022) 1259–1265

© 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 scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The Semi Circular Bend Specimens loaded in symmetric three point bending were considered to investigate the size effect in PLA and PETG specimens obtained using FDM technology. Four specimen sizes were manufactured with radius R = 10, 20, 30 and 40 mm, with thickness of 6 mm and tested. A strong size effect for PLA and PETG materials obtained through additive manufacturing is experimentally demonstrated, representing the transition between strength of materials approach (with no size effect) and asymptotic case of linear elastic fracture mechanics. This agrees well with the size effect law proposed by Bažant (2002) and Zdenek et al. (2003). © 2020 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 23 European Conference on Fracture - ECF23 Keywords: size effect; PLA; PETG 1. Introduction The Fused Deposition Modelling (FDM) is one of the most widely used tehnology in additive manufacturing. The FDM technology is based on the extrusion of a fillament; its success is mainly due to its cost-effective way of printing and the ease of obtaining parts, Singh et al. (2020), Ben et al. (2019), Zhao et. al (2019). In FDM process, the 3D printing machine contains a plastic wire spool feeding, a print head (nozzle) which extrudes a thin filament of melted plastic, forming, layer-by-layer according to a CAD file, the final component Masood (2016), Valean et al. (2020). A i i l i l i t i t i t i i t i ti t t i t i i t i i t l . i i t it i , , , it t i t t . t i t t i l t i t iti t i i i t ll t t , ti t t iti t t t t i l it i t t ti li l ti t i . i ll it t i t l t t l. . t . li lsevier B.V. This is an open access article under the CC BY-NC-ND licen tt :// ti . /li / / . / i i ilit t : i ff t; ; . i iti lli i t t i l t l i iti t i . t l i t t i ill t; it i i l t it t ti i ti t t i i t , i t l. , t l. , t. l . , t i ti i t i l ti i l i , i t l i t t i il t lt l ti , i , l l i t il , t i l t , l t l. . 23 European Conference on Fracture - ECF23 Size effect in PLA and PETG specimens obtained using FDM Liviu Marsavina a *, Mihai Marghitas a , Estera Valean a a University Politehnica Timisoara, Department of Mechanics and Strength of Materials, Blvd. M. Viteazu, No. 1, Timisoara 30006, Romania i it lit i i i , t t f i t t f t i l , l . . it , . , i i , i

* Corresponding author. Tel.: +0-000-000-0000 ; fax: +0-000-000-0000 . E-mail address: liviu.marsavina@upt.ro i t r. l.: - - - ; f : - - - . - il : li i . r i t.r rr

2452-3216 © 2020 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 23 European Conference on Fracture - ECF23 l i r . . i i rti l r t - - li ( tt :// r ti . r /li / - - / . /) i i ilit t - t r . li

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 scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.160