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Steel and Composite Structures Volume 59, Number 5, June 10 2026 , pages 655-677 DOI: https://doi.org/10.12989/scs.2026.59.5.655 |
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Low-cycle fatigue performance and life prediction of a new duplex stainless steel UNS S32001 |
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Peng Dai, Yuanqing Wang, Tianxiong Zhang, Mingze Wu, Yecheng Dai
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| Abstract | ||
| S32001 duplex stainless steel has recently been developed as a structural material in building engineering, offering an attractive balance of high mechanical strength, cost efficiency, and excellent corrosion resistance. Nevertheless, its low-cycle fatigue (LCF) behaviour has not been adequately investigated, which limits its wider engineering application. In this study, strain-controlled LCF tests were conducted on S32001 stainless steel under two strain ratios which comprised -1 and 0. For each strain ratio, seven strain amplitudes were employed which included 1.0%, 1.25%, 1.5%, 1.75%, 2.0%, 2.25% and 2.5%. The experimental program focused on cyclic deformation characteristics, stress-strain response, and fracture morphology. Fatigue life was further assessed using the Basquin-Coffin-Manson framework and a strain energy-based model. The results revealed that S32001 stainless steel exhibits a clear cyclic hardening-softening sequence and possesses fatigue resistance superior to that of conventional structural steels. Life prediction analyses indicated that the strain-life approach provides effective fatigue life estimations, with the Basquin-Coffin-Manson model showing better agreement with the experimental data than the strain energy model. | ||
| Key Words | ||
| Basquin-Coffin-Manson model; life prediction; low-cycle fatigue behaviour; S32001 duplex stainless steel | ||
| Address | ||
| Peng Dai:Department of Civil Engineering, Tsinghua University, China Yuanqing Wang:General Affairs Office, Southeast University, China Tianxiong Zhang:General Affairs Office, Southeast University, China Mingze Wu:General Affairs Office, Southeast University, China Yecheng Dai:Department of Civil Engineering, Tsinghua University, China | ||