PSI - Issue 41

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

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Procedia Structural Integrity 41 (2022) 505–509

2nd Mediterranean Conference on Fracture and Structural Integrity Penny-shaped cracks: A comparison between FFM and CZM Pietro Cornetti a *, Alberto Sapora a

a Department of Structural, Geotechnical and Building Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy

© 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 The brittle failure behavior of a solid containing a Penny-shaped crack and subjected to mode I loading conditions is investigated. The analysis is performed in a semi-analytical way by implementing different approaches: the coupled criterion of Finite Fracture Mechanics (FFM) and the Cohesive Zone Model (CZM). Results are compared in terms of the failure stress and the crack advance/process zone. © 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) 1. Introduction Finite Fracture Mechanics (FFM) is a failure criterion proposed for brittle or quasi-brittle materials: it is based on the assumption of a finite crack advance  and it involves two parameters, the material tensile strength  c and the fracture energy G c (or the toughness K Ic ). Failure load predictions are achieved by coupling the discrete energy with a suitable stress condition. Leguillon set the FFM approach in 2002. Since then, several applications of FFM have been provided and FFM can be now regarded as an effective tool to predict the strength of mechanical components (Sapora et al. 2014, Torabi et al. 2017, Cornetti et al. 2019), allowing fast strength predictions suitable for preliminary sizing of structures. Although some attempts have been recently done to extend the fracture criterion to 3D cases (Doitrand and Leguillon 2018), most of FFM applications deal with 2D geometries. In this study, the case of a Penny-shaped crack Peer-review under responsibility of the MedFract2Guest Editors. Keywords: Penny-shaped cracks; mode I; FFM; CZM; failure stress

* Corresponding author. Tel.: +39 -011-090- 4901 E-mail address: pietro.cornetti@polito.it

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. 10.1016/j.prostr.2022.05.057