TY - JOUR
T1 - Fe-Mn-Si alloy U-shaped dampers with extraordinary low-cycle fatigue resistance
AU - Zhang, Jie
AU - Fang, Cheng
AU - Yam, Michael C.H.
AU - Lin, Chengxin
N1 - Funding Information:
The financial supports from the National Natural Science Foundation of China (NSFC) with Grant Nos. 52078359, 51820105013, and 51778456 are gratefully acknowledged. Support for this study was also provided by the Shanghai Rising-Star Program (20QA1409400) and the Fundamental Research Funds for the Central Universities.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2022/8/1
Y1 - 2022/8/1
N2 - 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.
AB - 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.
KW - Fe-Mn-Si alloy
KW - Iron-based shape memory alloy
KW - Low-cycle fatigue
KW - Seismic resilience
KW - U-shaped damper
UR - http://www.scopus.com/inward/record.url?scp=85131147222&partnerID=8YFLogxK
U2 - 10.1016/j.engstruct.2022.114475
DO - 10.1016/j.engstruct.2022.114475
M3 - Journal article
AN - SCOPUS:85131147222
SN - 0141-0296
VL - 264
JO - Engineering Structures
JF - Engineering Structures
M1 - 114475
ER -