PSI - Issue 47

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 47 (2023) 296–309

27th International Conference on Fracture and Structural Integrity (IGF27) On the combined use of averaged strain energy density criteria (ASED) and equivalent material concept (ECC) for the fracture load prediction of additively manufactured PLA v-notched specimens G. Morettini a *, S.M.J. Razavi b , A. Staffa a , M. Palmieri a , F. Berto c , F. Cianetti a , C. Braccesi a a Dipartimento di Ingegneria, Università degli Studi di Perugia (UNIPG), via G. Duranti, Perugia 06124, Italy b Department of Mechanical and Industrial Engineering (NTNU), MTP Gløshaugen: Richard Birkelands vei 2B, Trondheim 491, Norway c Dipartimento Ingegneria Chimica Materiali Ambiente-Sapienza Università di Roma, Via Eudossiana, Roma 00184, Italy Abstract The growing introduction into the industrial world of additive fused deposition technologies, for producing functional components made of thermoplastic materials (such as PLA), pushes designers to know which methods for predicting breakage under load can be used to design correctly these elements. In particular, this paper analyses the “brittle fracture” phenomenon in these materials that too often occurs in various engineering sectors. This research article investigates a methodology for predicting fracture loads in additively manufactured PLA material specimens with different topologies of V-notches. The proposed method represents a direct evolution of the Average Strain Energy Density (ASED) criterion, originally conceived for brittle materials that develop a liner-elastic behavior. This method, in those cases where the material has a non-linear elastic behavior, has to be correct with the concept of equivalent elastic material (EMC), providing in that way, a simple and reliable method for local settlement prediction in PLA specimens. The results obtained demonstrate that, despite the many variables that come into play in the making process of the specimens, the ASED-EMC combined criteria provide accurate predictions. The breaking load was predicted with an average deviation from the experimental fracture loads of less than 12%. © 2023 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 IGF27 chairpersons Keywords: PLA additive manufacturing; V-notch specimen; average strain energy density SED; equivalent material concept EMC. © 2023 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 IGF27 chairpersons

* Giulia Morettini. Tel.: +39 0755853723 E-mail address: giulia.morettini@unipg.it

2452-3216 © 2023 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 IGF27 chairpersons

2452-3216 © 2023 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 IGF27 chairpersons 10.1016/j.prostr.2023.07.095