Fe-Mn-Si alloy U-shaped dampers with extraordinary low-cycle fatigue resistance

Jie Zhang, Cheng Fang, Michael C.H. Yam, Chengxin Lin

Research output: Journal article publicationJournal articleAcademic researchpeer-review

21 Citations (Scopus)

Abstract

This study presents a new type of Fe-Mn-Si alloy U-shaped dampers (FMS-UDs) that exhibit extraordinary low cycle fatigue (LCF) performance. The basic material properties of Fe-Mn-Si alloy were first evaluated by a series of material tests considering both the monotonic and cyclic loading schemes, where normal carbon steel specimens were also tested for comparison. After the material tests, a total of 30 U-shaped dampers were examined, considering various parameters such as material type, geometry, loading direction and strain rate. Following the experimental program, finite element models were established to help interpret the test result. The material tests showed that Fe-Mn-Si alloy exhibited non-obvious yield plateau and moderate strain hardening under monotonic loading. Spring-back phenomenon, non Masing behavior, and excellent LCF performance were generally observed under cyclic loading. The damper tests showed that the FMS-UDs exhibited slightly “narrower” hysteresis responses compared with normal steel dampers. The LCF life and the total energy dissipation of the FMS-UDs are up to 7 times that of their steel counterparts, depending on the parameters considered. From a modeling point of view, the hysteretic behavior of the Fe-Mn-Si alloy could be adequately captured by a combined kinematic/isotropic hardening model. By using the calibrated parameters from the material tests, the hysteresis behavior and stress distribution of the FMS-UDs can be well represented. Critical locations which are prone to fatigue failure of the FMS-UDs were accurately captured by the numerical model, and the predictions agree very well with the test results.

Original languageEnglish
Article number114475
JournalEngineering Structures
Volume264
DOIs
Publication statusPublished - 1 Aug 2022

Keywords

  • Fe-Mn-Si alloy
  • Iron-based shape memory alloy
  • Low-cycle fatigue
  • Seismic resilience
  • U-shaped damper

ASJC Scopus subject areas

  • Civil and Structural Engineering

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