PSI - Issue 57

ScienceDirect Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 57 (2024) 502–509 Structural Integrity Procedia 00 (2022) 000 – 000

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2452-3216 © 2024 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 scientific committee of the Fatigue Design 2023 organizers 10.1016/j.prostr.2024.03.055 2452-3216 © 2023 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 scientific committee of the Fatigue Design 2023 organizers This work aims to determine the fatigue limit of the A357 receiving a T6 treatment, considering the defects of the shrinkage type which occur during the manufacturing process. This cast alloy has a dendritic structure resulting from solidification conditions and mainly from the thermal gradients generated by cooling as indicated by Ashby (2013) and Bailon (2002). 2452-3216 © 2023 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 scientific committee of the Fatigue Design 2023 organizers This work aims to determine the fatigue limit of the A357 receiving a T6 treatment, considering the defects of the shrinkage type which occur during the manufacturing process. This cast alloy has a dendritic structure resulting from solidification conditions and mainly from the thermal gradients generated by cooling as indicated by Ashby (2013) and Bailon (2002). © 2024 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 scientific committee of the Fatigue Design 2023 organizers Abstract In the presence of casting defects, aluminium components are subjected to multiaxial loadings. The objective of this study is to estimate the fatigue limit for defective cast aluminium alloy A357 with T6 treatment. This investigation is based on the analysis of the Crossland equivalent stress in the vicinity of the casting defect using the finite element (FE)method. The defect shape is a semi-spherical void at the surface of a sample submitted to tension fatigue loading. The affected depth of this material is calculated and defined as the depth from the tip of the defect to the interior of the specimen. The Kitagawa-Takahashi diagrams corresponding to different microstructures and two loading ratios R=- 1 and R=0.1 are simulated based on the affected depth approach. Simulations are compared to the experimental results carried out on the same alloy. The calculations agree well with results inferred from experimental results. Finally, a comparative analysis is carried out between A356 and A357 built on the affected depth approach. Keywords: cast A357; high cycle fatigue; defect; affected depth; Kitagawa diagram. Abstract In the presence of casting defects, aluminium components are subjected to multiaxial loadings. The objective of this study is to estimate the fatigue limit for defective cast aluminium alloy A357 with T6 treatment. This investigation is based on the analysis of the Crossland equivalent stress in the vicinity of the casting defect using the finite element (FE)method. The defect shape is a semi-spherical void at the surface of a sample submitted to tension fatigue loading. The affected depth of this material is calculated and defined as the depth from the tip of the defect to the interior of the specimen. The Kitagawa-Takahashi diagrams corresponding to different microstructures and two loading ratios R=- 1 and R=0.1 are simulated based on the affected depth approach. Simulations are compared to the experimental results carried out on the same alloy. The calculations agree well with results inferred from experimental results. Finally, a comparative analysis is carried out between A356 and A357 built on the affected depth approach. Keywords: cast A357; high cycle fatigue; defect; affected depth; Kitagawa diagram. 1. Introduction Aluminum has several qualities. It has a good compromise between strength and tenacity and between its low weight and mechanical properties. Moreover, it is characterized by its corrosion resistance and recyclability. The present work will focus on the Al-Si-Mg family which is used in the aviation (A357-T6) and automotive (A356-T6) industries. Fatigue Design 2023 (FatDes 2023) Fatigue assessment of defective A357-T6 cast aluminum based on affected depth Nesrine Majed , ,Anouar Nasr , a LGM, ENIM, Université de Monastir, Avenue Iben Eljazzar , Monastir 5019 , Tunisia b IPEIM, Université de Monastir, Avenue Iben Eljazzar , Monastir 5019 , Tunisia Fatigue Design 2023 (FatDes 2023) Fatigue assessment of defective A357-T6 cast aluminum based on affected depth Nesrine Majed , ,Anouar Nasr , a LGM, ENIM, Université de Monastir, Avenue Iben Eljazzar , Monastir 5019 , Tunisia b IPEIM, Université de Monastir, Avenue Iben Eljazzar , Monastir 5019 , Tunisia 1. Introduction Aluminum has several qualities. It has a good compromise between strength and tenacity and between its low weight and mechanical properties. Moreover, it is characterized by its corrosion resistance and recyclability. The present work will focus on the Al-Si-Mg family which is used in the aviation (A357-T6) and automotive (A356-T6) industries.