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Thermal debonding of inclusions in compacted graphite iron: Effect of matrix phases

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This paper investigates graphite decohesion as the primary fracture mechanism of compacted graphite iron (CGI) subjected to thermal load. Despite CGI’s extensive industrial use and considerable research on its mechanical behaviour, thermal debonding is not yet fully understood, nor is the influence of matrix phases on it. After thermal cycling to confirm the occurrence of the phenomenon, a numerical approach is developed: a 2D unit cell is constructed, with a single graphite particle, represented as an ellipse embedded in a metallic matrix. The inclusion is surrounded by an extra layer that accounts for either pearlite or ferrite, in order to study their effect on thermal debonding. An elastoplastic behaviour is assumed for all constituents, described with a classical J2 flow theory of plasticity, and the models are analysed employing a finite-element approach. The proposed numerical strategy focuses on the influence of matrix phases on thermal debonding, identifying numerical schemes to assess it. The obtained results can provide significant knowledge on the response of CGI to thermal load at microscale, contributing to understanding of its macroscopic thermomechanical behaviour.

History

School

  • Mechanical, Electrical and Manufacturing Engineering

Published in

Engineering Failure Analysis

Volume

139

Publisher

Elsevier

Version

VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence (CC BY-NC-ND). Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/

Acceptance date

20/05/2022

Publication date

2022-05-30

Copyright date

2022

ISSN

1350-6307

Language

en

Depositor

Dr Konstantinos Baxevanakis. Deposit date: 31 May 2022

Article number

106476