PSI - Issue 54

Xingling Luo et al. / Procedia Structural Integrity 54 (2024) 75–82 Xingling Luo et al. / Structural Integrity Procedia 00 (2023) 000–000

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4. Conclusions In this study, the effect of graphite morphology on the tensile fracture process of compacted graphite iron was investigated. Using a micromechanical approach, statistical results obtained from microstructural characterisation were utilised to create a two-dimensional unit cell with a single inclusion. The graphite particle and the matrix were assigned elastoplastic behaviours. This model incorporated periodic boundary conditions and cohesive-zone elements. The following conclusions can be drawn from this study: • The numerical results were primarily affected by the choice of boundary conditions. • The use of PBCs showed that the calculated response of the materials was stiffer and prevented the crack from crossing the boundary of the RVE. Although the case with PBCs expedited interface debonding, it effectively impeded the propagation of cracks into the matrix. In conclusion, the presented methodology for the simulation of crack initiation and propagation under tensile loading is suitable for further research on the fracture behaviours of CGI. Acknowledgements The authors gratefully acknowledge the financial support of China Scholarship Council (CSC) (Contract No. 202208060383). References Beskou ND and Muho E V (2022) Microstructural effects on dynamic response of rigid and flexible pavements to moving load under plane strain. Soil Dynamics and Earthquake Engineering 163: 107544. Cao M, Baxevanakis KP and Silberschmidt V V. (2023) Effect of graphite morphology on the thermomechanical performance of compacted graphite iron. Metals 13(3). Chen X, Chen L, Chen H, et al. (2022) Meso-scale numerical simulation and experimental verification of single grain grinding TiC–Fe composites. Ceramics International 48(9): 12299–12310. Collini L and Pirondi A (2019) Microstructure-based RVE modeling of the failure behavior and LCF resistance of ductile cast iron. Procedia Structural Integrity 24: 324–336. Dawson S (1999) Compacted graphite iron: Mechanical and physical properties for engine design. VDI Berichte: 85–105. Gad SI, Attia MA, Hassan MA, et al. (2021) Predictive computational model for damage behavior of metal-matrix composites emphasizing the effect of particle size and volume fraction. Materials 14(9). Greenstreet WL, Yahr GT and Valachovic RS (1969) The behavior of graphite under biaxial tension. Carbon 11: 43–57. Jivkov AP (2018) Structure of micro-crack population and damage evolution in quasi-brittle media. Theoretical and Applied Fracture Mechanics 70: 1–9. Johnson GR and Cook WH (1985) Fracture characteristics of three metals subjected to various strains, strain rates, temperatures and pressures. Engineering Fracture Mechanics 21: 31–48. Naghdinasab M, Farrokhabadi A and Madadi H (2018) A numerical method to evaluate the material properties degradation in composite RVEs due to fiber-matrix debonding and induced matrix cracking. Finite Elements in Analysis and Design 146: 84–95. Paggi M and Wriggers P (2011) A nonlocal cohesive zone model for finite thickness interfaces - Part I: Mathematical formulation and validation with molecular dynamics. Computational Materials Science 50(5): 1625–1633. Palkanoglou EN, Baxevanakis KP and Silberschmidt V V (2020) Interfacial debonding in compacted graphite iron: effect of thermal loading. Procedia Structural Integrity 28: 1286–1294. Palkanoglou EN, Baxevanakis KP and Silberschmidt V V (2021) Computational modelling of thermomechanical behaviour of cast irons: effect of boundary conditions. (World Congress in Computational Mechanics (WCCM)). Epub ahead of print 2021. DOI: 10.23967/wccm eccomas.2020.099. Palkanoglou EN, Baxevana kis KP and Silberschmidt V V (2022) Thermal debonding of inclusions in compacted graphite iron : Effect of matrix phases. Engineering Failure Analysis 139: 1–13. Papakaliatakis G and Karalekas D (2010) Damage growth by debonding in a single fibre metal matrix composite: Elastoplasticity and strain energy density criterion. Theoretical and Applied Fracture Mechanics 53(2): 152–157. Qiu Y, Pang JC, Yang EN, et al. (2016) Transition of tensile strength and damaging mechanisms of compacted graphite iron with temperature.