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Subject: search.filters.subject.620Institute: search.filters.UBSInstitut.Graduate School of Excellence for Advanced Manufacturing Engineering (GSaME)Author: search.filters.author.Csanádi, Tamás

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    ItemOpen Access
    Assessing fatigue life cycles of material X10CrMoVNb9-1 through a combination of experimental and finite element analysis
    (2023) Rahim, Mohammad Ridzwan Bin Abd; Schmauder, Siegfried; Manurung, Yupiter H. P.; Binkele, Peter; Dusza, Ján; Csanádi, Tamás; Ahmad, Meor Iqram Meor; Mat, Muhd Faiz; Dogahe, Kiarash Jamali
    This paper uses a two-scale material modeling approach to investigate fatigue crack initiation and propagation of the material X10CrMoVNb9-1 (P91) under cyclic loading at room temperature. The Voronoi tessellation method was implemented to generate an artificial microstructure model at the microstructure level, and then, the finite element (FE) method was applied to identify different stress distributions. The stress distributions for multiple artificial microstructures was analyzed by using the physically based Tanaka-Mura model to estimate the number of cycles for crack initiation. Considering the prediction of macro-scale and long-term crack formation, the Paris law was utilized in this research. Experimental work on fatigue life with this material was performed, and good agreement was found with the results obtained in FE modeling. The number of cycles for fatigue crack propagation attains up to a maximum of 40% of the final fatigue lifetime with a typical value of 15% in many cases. This physically based two-scale technique significantly advances fatigue research, particularly in power plants, and paves the way for rapid and low-cost virtual material analysis and fatigue resistance analysis in the context of environmental fatigue applications.
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    ItemOpen Access
    Multicale study of the fatigue life of AlSi10Mg material produced by laser powder bed fusion (LPBF) method : experimental and computational
    (2025) Jamali Dogahe, Kiarash; Csanádi, Tamás; Schneider, Yanling; Xu, Chensheng; Guski, Vinzenz; Dhar Swarna, Anindita; Dusza, Jan; Schmauder, Siegfried; Bozic, Zeljko; Pezeshki, Mahmoud; Ridzwan Bin Abd Rahim, Mohammad
    This study investigates the fatigue life of AlSi10Mg alloy produced by laser powder bed fusion (LPBF) using experimental and multiscale modeling methods. A micromodel developed based on EBSD and SEM data simulates fatigue microcrack nucleation with the Tanaka-Mura model and FEM. The effects of the alloys heterogeneous microstructure, including SiC particles, on fatigue crack initiation are examined. Micropillar tests and high‐resolution SEM analyses study slip system behavior and plastic deformation. Long crack propagation is analyzed using the NASGRO equation, with total cycles till failure calculated for each stress amplitude. The fatigue life results, represented in an S-N$$ S-N $$curve, show good agreement between computational and experimental data. Microscopic and macroscopic features like second phases, grain sizes, orientations, and macropores significantly influence the fatigue life of LPBF materials.