PSI - Issue 52

Tomislav Polančec et al. / Procedia Structural Integrity 52 (2024) 348 – 355 Tomislav Polančec, Tomislav Lesičar, Jakov Rako / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig.4. Distribution of the PF variable at the final stage: a) 2D model, b) 3D model, c) comparison to real specimen

4. Conclusion The paper deals with calibration of the plastic hardening and PF parameters required for numerical modelling of constitutive behaviour of sintered steel Astaloy Mo+0.2C. The parameters are calibrated by comparison to the experimental uniaxial tensile test. It can be concluded that the obtained PF and material parameters have been successfully verified by experimental results. The verification procedure is performed by comparison of the force displacement and the equivalent stress-equivalent strain curves obtained by numerical simulations and experiment. For constitutive modelling of the material behaviour, nonlinear isotropic and kinematic hardening is included, assuming quasi-brittle fracture. The damage behaviour is described by means of the PF method. In numerical simulations, PF methodology proposed in [25] and embedded into FE software Abaqus is used. Additionally, numerical simulations are conducted in 3D setting, as well as by assuming plane strain and plane stress state. Comparing the numerical results to the experimental investigations, it has been concluded that very good correspondence of the results has been obtained in 3D and plane stress framework, while the plane strain assumption overestimates the results. Acknowledgement This work has been supported and co-funded by the European Union through the European Regional Development Fund, Operational Programme “Competitiveness and Cohesion 2014 – 2020” of the Republic of Croatia, project ImproWE - Improvement of High-efficiency Welding Technology (KK.01.1.1.07.0075). References [1] Frech T, Scholzen P, Schäflein P, Löpenhaus C, Kauffmann P, Klocke F. Design for PM Challenges and Opportunities for Powder Metal Components in Transmission Technology. Procedia CIRP 2018;70:186 – 91. https://doi.org/10.1016/J.PROCIR.2018.03.267. [2] Desplanques B, Saunier S, Valdivieso F, Desrayaud C. A Binghamian model for the constrained sintering simulation. Mechanics of Materials 2016;92:248 – 60. https://doi.org/10.1016/J.MECHMAT.2015.10.003. [3] Dizdar S. Pitting resistance of sintered small-module gears. Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 2013;227:1225 – 40. https://doi.org/10.1177/1350650113486082. [4] Knutsson P, Olsson K, Larsson M. Solutions for high density PM components. Proceedings of PM2010 powder metallurgy, Florence, Italy: 2010.