Low-Cycle Fatigue Performances Including Large Plastic Strain of SUS821L1 Lean Duplex Stainless Steel

EasyChair Preprint 13168

Abstract

Owing to the high corrosion resistance and high strength-to-mass ratio, lean duplex stainless steel is expected to contribute to increased strength and reduction of the component thickness, helping to achieve light weight structural design goal. When considering the use of lean duplex stainless steel in the main component, it is necessary to investigate the seismic performance of structures. In such a case, the material level of the main component under strong earthquake is subjected to a larger strain. To date, however, test data on duplex stainless steel is limited to ±5% or less, which is insufficient to analyze the response of stainless-steel structures in large plastic strain during strong earthquakes. This paper investigates the low-cycle fatigue (LCF) performances, including large strains (> ±5%), of SUS821L1 lean duplex stainless steel at the material level. It was tested under constant strain amplitudes from ±2% to ±12%. The obtained results were compared with previous studies considering stainless and carbon steels. The results showed SUS821L1 has significantly higher yield and tensile strengths than other steels. Besides, the LCF performance of SUS821L1 differs from that of other steels. It was confirmed that this difference can be explained using the skeleton and Bauschinger parts decomposed from hysteretic curves.

Keyphrases: Bauschinger part, Large plastic strain, Lean duplex stainless steel, low cycle fatigue, skeleton curve

@booklet{EasyChair:13168,
  author    = {Thaileang Touch and Shoichi Kishiki and Satoshi Yamada},
  title     = {Low-Cycle Fatigue Performances Including Large Plastic Strain of SUS821L1 Lean Duplex Stainless Steel},
  howpublished = {EasyChair Preprint 13168},
  year      = {EasyChair, 2024}}