PSI - Issue 37

ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceD rect Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 37 (2022) 209–216

© 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 Pedro Miguel Guimaraes Pires Moreira Abstract This paper focuses on investigation of the interaction effect of graphite inclusions on failure of compacted graphite iron (CGI) subjected to thermal load. Although CGI has been used extensively in industrial applications and studied for many years, its failure under pure thermal load has not yet been fully understood, nor has the influence of interacting graphite particles on it. To analyse this phenomenon, a finite-element two-dimensional unit cell is constructed, consisting of two graphite particles presented as ellipses embedded in a metallic matrix. Each inclusion is surrounded by a thin layer that accounts for its interface in order to study its decohesion from the surrounding matrix. An elastoplastic behaviour is assumed for both graphite and matrix material, described by classical J2 flow theory of plasticity, whereas a traction-separation law is applied to the interface. The model is analysed numerically, with an emphasis on the influence of different parameters such as the inclusion size, the distance between the particles, and the combination of their shapes on thermal debonding, identifying critical combinations that either deteriorate or relieve the effect. The obtained results can provide significant knowledge on the response of CGI under thermal load at the microscale, contributing also to understanding of its macroscopic behaviour at elevated temperatures. © 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 Pedro Miguel Guimaraes Pires Moreira Keywords: CGI; decohesion, interaction; thermal load; numerical modeling Abstract This paper focuses on investigation of the interaction effect of graphite inclusions on failure of compacted graphite iron (CGI) subjected to thermal load. Al hough CGI as b en used xt nsively in industrial applications and studied for many years, its failure und r pure thermal load has n t yet been fully u derstood, or has the influence of nteracting graph te pa ticles on it. To ana ys this phenomenon, a finite-element two-dimensio al unit cell is con tructed, co sisting of two graphite particles presented as ellipses embedded in a metall c matrix. Each inclusion is surrounded by a thin layer that accounts for its interface in order to study it decohesion fro the surrounding matrix. An ela toplastic b haviour is assumed for b th graphite a d m trix material, described by clas ical J2 flow the ry of plastic ty, wh reas a tra tion-separat on law is applied to the interface. The odel is analys numerically, with an emphasis on the influenc of diffe en parameters such as the inc usion siz , th distance between the particl s, and the combinatio of t eir shapes o th rmal debondi g, identifying ritical combinations that either d teriorat or relieve the effect. The obt ined results can provide significant knowle ge on the esponse of CGI under thermal load at the microscal , contributing also to understandi g f its macroscopic behaviour at elevated temp ratures. © 2022 The Auth rs. 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 Pedro Miguel Guimaraes Pires Moreir K ywords: CGI; cohesi , interaction; thermal load; numerical modeling ICSI 2021 The 4th International Conference on Structural Integrity Thermal debonding in compacted graphite iron: effect of interaction of graphite inclusions Evangelia Nektaria Palkanoglou, Konstantinos P. Baxevanakis*, and Vadim V. Silberschmidt ICSI 2021 The 4th International Conference on Structural Integrity Thermal debonding in compacted graphite iron: effect of interaction of graphite inclusions Evangelia Nektaria Palkanoglou, Konstantinos P. Baxevanakis*, and Vadim V. Silberschmidt Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK

* Corresponding author. Tel: +44 (0) 1509 227030. E-mail address : K.Baxevanakis@lboro.ac.uk * Corresponding author. Tel: +44 (0) 1509 227030. E-mail address : K.Baxevanakis@lboro.ac.uk

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 Pedro Miguel Guimaraes Pires Moreira 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 u der re ponsibility of Pedro Miguel Guimara s Pires Moreira

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.02.049