Details
| Original language | English |
|---|---|
| Article number | 110799 |
| Journal | Thin-walled structures |
| Volume | 188 |
| Early online date | 9 May 2023 |
| Publication status | Published - Jul 2023 |
Abstract
The present paper investigates mechanical properties and recovery stress behavior of an iron-based shape memory alloy (Fe-SMA) with a special focus on the effect of fatigue and thermal loading. Change in recovery stress of activated Fe-SMAs subjected to fatigue at RT, −20 °C, 60 °C, and −20 to 60 °C was monitored. A second activation after fatigue was performed to investigate the retrievability of the lost recovery stress owing to fatigue. Coefficients of thermal expansion (CTEs) of the samples with different activation histories were also calculated. Results showed that the maximum reduction in recovery stress after two million cyclic loads of Δɛ=0.070% was approximately 20% under RT and −20 °C. A high temperature (60 °C) weakened such detrimental effect owing to higher critical stresses for martensitic transformation at higher temperatures, leading to only 10% reduction in recovery stress. Loss in the recovery stress due to fatigue was pronouncedly retrieved by a reactivation regardless of the temperature scenarios. This study extends understanding of recovery stress behavior of Fe-SMAs subjected to fatigue and thermal loading, and explores the retrievability of relaxed recovery stress by a second activation.
Keywords
- Fatigue, Iron-based shape memory alloy, Reactivation, Recovery stress, Thermal loading
ASJC Scopus subject areas
- Engineering(all)
- Civil and Structural Engineering
- Engineering(all)
- Building and Construction
- Engineering(all)
- Mechanical Engineering
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In: Thin-walled structures, Vol. 188, 110799, 07.2023.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Recovery stress behavior of Fe-SMA under fatigue and thermal loading
AU - Chen, Zhen Yu
AU - Gu, Xiang Lin
AU - Vollmer, Malte
AU - Niendorf, Thomas
AU - Ghafoori, Elyas
AU - Yu, Qian Qian
N1 - Funding Information: This study was supported by the National Natural Science Foundation of China (Project Nos. 52222803 , 51938013 and 51878485 ) and National Key R&D Program of China ( 2022YFC3803000 ). We also thank re-fer AG in Switzerland for providing Fe-SMA materials.
PY - 2023/7
Y1 - 2023/7
N2 - The present paper investigates mechanical properties and recovery stress behavior of an iron-based shape memory alloy (Fe-SMA) with a special focus on the effect of fatigue and thermal loading. Change in recovery stress of activated Fe-SMAs subjected to fatigue at RT, −20 °C, 60 °C, and −20 to 60 °C was monitored. A second activation after fatigue was performed to investigate the retrievability of the lost recovery stress owing to fatigue. Coefficients of thermal expansion (CTEs) of the samples with different activation histories were also calculated. Results showed that the maximum reduction in recovery stress after two million cyclic loads of Δɛ=0.070% was approximately 20% under RT and −20 °C. A high temperature (60 °C) weakened such detrimental effect owing to higher critical stresses for martensitic transformation at higher temperatures, leading to only 10% reduction in recovery stress. Loss in the recovery stress due to fatigue was pronouncedly retrieved by a reactivation regardless of the temperature scenarios. This study extends understanding of recovery stress behavior of Fe-SMAs subjected to fatigue and thermal loading, and explores the retrievability of relaxed recovery stress by a second activation.
AB - The present paper investigates mechanical properties and recovery stress behavior of an iron-based shape memory alloy (Fe-SMA) with a special focus on the effect of fatigue and thermal loading. Change in recovery stress of activated Fe-SMAs subjected to fatigue at RT, −20 °C, 60 °C, and −20 to 60 °C was monitored. A second activation after fatigue was performed to investigate the retrievability of the lost recovery stress owing to fatigue. Coefficients of thermal expansion (CTEs) of the samples with different activation histories were also calculated. Results showed that the maximum reduction in recovery stress after two million cyclic loads of Δɛ=0.070% was approximately 20% under RT and −20 °C. A high temperature (60 °C) weakened such detrimental effect owing to higher critical stresses for martensitic transformation at higher temperatures, leading to only 10% reduction in recovery stress. Loss in the recovery stress due to fatigue was pronouncedly retrieved by a reactivation regardless of the temperature scenarios. This study extends understanding of recovery stress behavior of Fe-SMAs subjected to fatigue and thermal loading, and explores the retrievability of relaxed recovery stress by a second activation.
KW - Fatigue
KW - Iron-based shape memory alloy
KW - Reactivation
KW - Recovery stress
KW - Thermal loading
UR - http://www.scopus.com/inward/record.url?scp=85158894584&partnerID=8YFLogxK
U2 - 10.1016/j.tws.2023.110799
DO - 10.1016/j.tws.2023.110799
M3 - Article
AN - SCOPUS:85158894584
VL - 188
JO - Thin-walled structures
JF - Thin-walled structures
SN - 0263-8231
M1 - 110799
ER -