PSI - Issue 75

Monisha Manjunatha et al. / Procedia Structural Integrity 75 (2025) 650–659 Monisha Manjunatha et al. / Structural Integrity Procedia (2025)

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further investigated using Scanning Electron Microscopy (SEM) and optical microscopy to gain insights into the failure mechanisms and to identify any corrosion-induced features or a typical crack paths. In parallel, fatigue crack growth behaviour will be investigated using Compact Tension (CT) samples under varying environmental conditions, such as controlled corrosion environments and subzero temperatures. These results will be compared to baseline tests conducted in room temperature to quantify the impact of environmental degradation on crack growth rates. Lastly, a systematic parametric study will be carried out to assess the influence of various testing parameters, including frequency and stress ratio, on fatigue performance. This comprehensive approach will help isolate key factors that govern fatigue life under coupled mechanical and environmental loading, ultimately contributing to the development of more robust fatigue design methodologies. Acknowledgements The authors would like to acknowledge the support for this study, which was provided by the Weir Group PLC (WARC2011-SAA1, 2011) via its establishment of the Weir Advanced Research Centre (WARC) at the University of Strathclyde. References ASTM E647 – 23a, Standard Test Method for Measurement of Fatigue Crack Growth Rates. The Japan Welding Engineering Society, 2017. WES 1112:2017 Standard Test Method for Ultrasonic Fatigue Testing of Metallic Ma terials. Tokyo, Japan. Dantas, R., Gouveia, M., Silva, F. G. A., Fiorentin, F., de Jesus, A., Correia, J., & Lesiuk, G. (2022). Very high cycle fatigue behaviour of S690 structural steel. Procedia Structural Integrity , 42 , 1676 – 1683. https://doi.org/https://doi.org/10.1016/j.prostr.2022.12.211 de Jesus, A. M. P., Matos, R., Fontoura, B. F. C., Rebelo, C., Simões da Silva, L., & Veljkovic, M. (2012). A comparison of the fatigue behavior between S355 and S690 steel grades. Journal of Constructional Steel Research , 79 , 140 – 150. https://doi.org/https://doi.org/10.1016/j.jcsr.2012.07.021 Gorash, Y., Comlekci, T., Styger, G., Kelly, J., & Brownlie, F. (2022). Investigation of S275JR+AR structural steel fatigue performance in very high cycle domain. Procedia Structural Integrity , 38 , 490 – 496. https://doi.org/https://doi.org/10.1016/j.prostr.2022.03.049 Milne, L., Gorash, Y., Comlekci, T., & MacKenzie, D. (2022). Frequency Effects in Ultrasonic Fatigue Testing (UFT) of Q355B Structural Steel. Procedia Structural Integrity , 42 , 623 – 630. https://doi.org/https://doi.org/10.1016/j.prostr.2022.12.079 Schönbauer, B. M., Ghosh, S., Karr, U., Pallaspuro, S., Kömi, J., Frondelius, T., & Mayer, H. (2022). Mean-stress sensitivity of an ultrahigh strength steel under uniaxial and torsional high and very high cycle fatigue loading. Fatigue & Fracture of Engineering Materials & Structures , 45 (11), 3361 – 3377. https://doi.org/10.1111/ffe.13767 Schuller, R., Karr, U., Irrasch, D., Fitzka, M., Hahn, M., Bacher-Höchst, M., & Mayer, H. (2015). Mean stress sensitivity of spring steel in the very high cycle fatigue regime. Journal of Materials Science , 50 (16), 5514 – 5523. https://doi.org/10.1007/s10853-015-9098-6 Shiozawa, K., Lu, L., & Ishihara,S. (2001). S – N curve characteristics and subsurface crack initiation behaviour in ultra -long life fatigue of a high carbon-chromium bearing steel. Fatigue & Fracture of Engineering Materials & Structures , 24 (12), 781 – 790. https://doi.org/https://doi.org/10.1046/j.1460-2695.2001.00459.x Wang, J., Zhang, Y., Yu, C., & Zhao, B. (2022). Effect of Microstructure on the Corrosion Fatigue Crack Growth of Low and Medium Steels. Advances in Materials Science and Engineering , 2022 (1), 6244950. https://doi.org/https://doi.org/10.1155/2022/6244950