PSI - Issue 66

Miu Hayashi et al. / Procedia Structural Integrity 66 (2024) 161–166 Author name / Structural Integrity Procedia 00 (2025) 000–000

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4. Conclusion In this study, to investigate the effect of anodising treatment on fatigue properties and to clarify the fatigue fracture mechanism, specimens with anodised films of different thicknesses were prepared, and fatigue tests were conducted. The following conclusions were drawn from the results of this study: 1. Under the conditions of stress ratio R =-1 and axial loading fatigue test, anodised film cracking is a factor that reduces fatigue strength. However, if cracking does not occur, fatigue strength is not reduced by anodising. 2. The fatigue strength decreased with increasing film thickness, and a significantly different result was observed in the low-stress amplitude area. 3. When cracking does not occur, fatigue cracks occur at the interface between the anodised film and the base metal. When cracking occurs, the anodised material exhibits a fatigue fracture, which is initiated by cracking. Acknowledgments This research was supported by Light Metal Educational Foundation of Japan. References 1. Baohua Nie, Zheng Zhang, Zihua Zhao, Qunpeng Zhong, “Effect of anodizing treatment on the very high cycle fatigue behavior of 2A12 T4 aluminum ally”, Materials and Design, Vol.50, 1005-1010(2013). 2. Kittisak Chanyathunyaroj, Witthaya Samit, Chaweewan Poonthananiwatkul, Sompob Phetchcrai, “Effect of Coatings on the mechanical Properties and Fatigue Life of 6061 Aluminum Alloys”, Trans Indian Inst Met, Vol.74, 2135-2147 (2021). 3. Teng-Shih Shih, Tin-hou Lee, Ying-Jhe Jhou, “The effects of Anodization Treatment on the Microstructure and Fatigue Behavior of 7075 T73 Aluminum Alloy”, Materials Transactions, Vol.55, No.8, 1280-1285 (2014). 4. Teng-Shih Shih, Yi-Wei Chiu, “Corrosion resistance and high-cycle fatigue strength of anodized/sealed AA7050 and AA7075 alloys”, Applied Surface Science, Vol.352, 997-1003 (2015). 5. M. Shahzad, M. Chaussumier, R. Chieragatti, C. Mabru, F. Rezai-Aria, “Influence of Anodizing Process on Fatigue Life of Machined Aluminum Alloy”, Procedia Engineering, Vol.2, 1015-1024 (2010). 6. Majid Shahzad, Michel Chaussumier, Remy Chieragatti, Catherine Mabru, Farhad Rezai-Aria, “Effect of sealed anodic film on fatigue performance of 2214-T6 aluminum alloy”, Surface & Coatings Technology, Vol. 206, 2733-2739 (2012).