PSI - Issue 28

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 ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 28 (2020) 1286–1294

© 2020 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 European Structural Integrity Society (ESIS) ExCo Abstract In this work, graphite debonding under thermal loading in compacted graphite iron (CGI) is investigated, employing a microstructure-based modelling approach. CGI has a complex microstructure, comprising graphite particles of different shapes, sizes and orientations embedded in an iron matrix. As a result of mismatch in coefficients of thermal expansion of constituents, thermal load can result in damage due to interfacial debonding. To evaluate this phenomenon, representative volume elements of CGI microstructures are studied using finite-element simulations. Specific inputs in the model are provided through statistical analysis of SEM micrographs. Further, the influence of boundary conditions and incorporation of an interfacial layer is discussed. The obtained results demonstrate that the onset of matrix plasticisation and graphite decohesion are sensitive to the adopted modelling assumptions. © 2020 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 European Structural Integrity Society (ESIS) ExCo Keywords: graphite debonding; CGI; cohesive elements; unit cell; periodic boundary conditions. 1. Introduction Cast iron is a wide group of ferrous alloys, which major alloying elements are iron, carbon and silicon. Contents of carbon and silicon are ranging from 2 to 4% wt (in the form of either graphite or carbide) and 1 to 3%, respectively. Graphite inclusions of different morphology are found in various types of cast iron. Flake graphite exists in grey 1st Virtual European Conference on Fracture Interfacial debonding in compacted graphite iron: effect of thermal loading Evangelia Nektaria Palkanoglou, Konstantinos P. Baxevanakis * , Vadim V. Silberschmidt Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK Abstract In this work, graphite debonding under thermal loading in compacted graphite iron (CGI) is investigated, employing a microstructure-based modelling approach. CGI has a complex microstructure, comprising graphite particles of different shapes, sizes and orientations embedded in an iron matrix. As a result of mismatch in coefficients of thermal expansion of constituents, thermal load can result in damage due to interfacial debonding. To evaluate this phenomenon, representative volume elements of CGI microstructures are studied using finite-element simulations. Specific inputs in the model are provided through statistical analysis of SEM micrographs. Further, the influence of boundary conditions and incorporation of an interfacial layer is discussed. The obtained results demonstrate that the onset of matrix plasticisation and graphite decohesion are sensitive to the adopted modelling assumptions. © 2020 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 European Structural Integrity Society (ESIS) ExCo Keywords: graphite debonding; CGI; cohesive elements; unit cell; periodic boundary conditions. 1. Introduction Cast iron is a wide group of ferrous alloys, which major alloying elements are iron, carbon and silicon. Contents of carbon a d silicon are ranging f om 2 to 4% t (in the f m of either graphite or carbide) and 1 to 3%, respectiv ly. Graphite inclusions of differe t m rphol gy are found in various types of cast iron. Flake graphite exi ts in grey 1st Virtual European Conference on Fracture Interfacial debonding in compacted graphite iron: effect of thermal loading Evangelia Nektaria Palkanoglou, Konstantinos P. Baxevanakis * , Vadim V. Silberschmidt Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, LE11 3TU, UK

* Corresponding author. Tel.: +44 (0) 1509 227030; fax: +44 (0) 1509 227648 E-mail address: K.Baxevanakis@lboro.ac.uk * Corresponding author. Tel.: +44 (0) 1509 227030; fax: +44 (0) 1509 227648 E-mail address: K.Baxevanakis@lboro.ac.uk

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo

2452-3216 © 2020 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 European Structural Integrity Society (ESIS) ExCo 10.1016/j.prostr.2020.11.110