Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 349-362 |
| Seitenumfang | 14 |
| Fachzeitschrift | Materials and design |
| Jahrgang | 133 |
| Publikationsstatus | Veröffentlicht - 5 Nov. 2017 |
| Extern publiziert | Ja |
Abstract
Cyclic deformation and fatigue behavior of an iron-based shape memory alloy (Fe-SMA) Fe-17Mn-5Si-10Cr-4Ni-1(V,C) were studied. In the first step, cyclic tensile tests were performed to characterize the material's mechanical properties in tension (elongation at break, yield, and tensile strength) as well as the recovery behavior of the alloy. Furthermore, the effect of strain rate on the cyclic loading tests was investigated. It was observed that the strain rate has a clear influence on the stress-strain behavior of the alloy. In the second step, the fatigue behavior of the alloy after pre-straining and thermal activation under strain-controlled conditions was evaluated. While the stiffness of the alloy remained almost constant during high-cycle fatigue loading, a decrease in the recovery stress was observed, which should be taken into account in design assessments. The loss in the recovery stress was assumed to be mainly a result of a transformation-induced relaxation (TIR) under cyclic loading. Furthermore, this study examines the applicability of a constant life diagram (CLD) model to determine the fatigue limit of the alloy for different stress ratios (R). The existing results of the fatigue tests showed full consistency with the proposed fatigue design criterion. A formulation based on the CLD model was proposed for a safe design of the alloy as a structural pre-stressing element under a high-cycle fatigue loading regime.
ASJC Scopus Sachgebiete
- Werkstoffwissenschaften (insg.)
- Allgemeine Materialwissenschaften
- Ingenieurwesen (insg.)
- Werkstoffmechanik
- Ingenieurwesen (insg.)
- Maschinenbau
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in: Materials and design, Jahrgang 133, 05.11.2017, S. 349-362.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Fatigue behavior of a Fe-Mn-Si shape memory alloy used for prestressed strengthening
AU - Ghafoori, E.
AU - Hosseini, E.
AU - Leinenbach, C.
AU - Michels, J.
AU - Motavalli, M.
N1 - Publisher Copyright: © 2017 Elsevier Ltd
PY - 2017/11/5
Y1 - 2017/11/5
N2 - Cyclic deformation and fatigue behavior of an iron-based shape memory alloy (Fe-SMA) Fe-17Mn-5Si-10Cr-4Ni-1(V,C) were studied. In the first step, cyclic tensile tests were performed to characterize the material's mechanical properties in tension (elongation at break, yield, and tensile strength) as well as the recovery behavior of the alloy. Furthermore, the effect of strain rate on the cyclic loading tests was investigated. It was observed that the strain rate has a clear influence on the stress-strain behavior of the alloy. In the second step, the fatigue behavior of the alloy after pre-straining and thermal activation under strain-controlled conditions was evaluated. While the stiffness of the alloy remained almost constant during high-cycle fatigue loading, a decrease in the recovery stress was observed, which should be taken into account in design assessments. The loss in the recovery stress was assumed to be mainly a result of a transformation-induced relaxation (TIR) under cyclic loading. Furthermore, this study examines the applicability of a constant life diagram (CLD) model to determine the fatigue limit of the alloy for different stress ratios (R). The existing results of the fatigue tests showed full consistency with the proposed fatigue design criterion. A formulation based on the CLD model was proposed for a safe design of the alloy as a structural pre-stressing element under a high-cycle fatigue loading regime.
AB - Cyclic deformation and fatigue behavior of an iron-based shape memory alloy (Fe-SMA) Fe-17Mn-5Si-10Cr-4Ni-1(V,C) were studied. In the first step, cyclic tensile tests were performed to characterize the material's mechanical properties in tension (elongation at break, yield, and tensile strength) as well as the recovery behavior of the alloy. Furthermore, the effect of strain rate on the cyclic loading tests was investigated. It was observed that the strain rate has a clear influence on the stress-strain behavior of the alloy. In the second step, the fatigue behavior of the alloy after pre-straining and thermal activation under strain-controlled conditions was evaluated. While the stiffness of the alloy remained almost constant during high-cycle fatigue loading, a decrease in the recovery stress was observed, which should be taken into account in design assessments. The loss in the recovery stress was assumed to be mainly a result of a transformation-induced relaxation (TIR) under cyclic loading. Furthermore, this study examines the applicability of a constant life diagram (CLD) model to determine the fatigue limit of the alloy for different stress ratios (R). The existing results of the fatigue tests showed full consistency with the proposed fatigue design criterion. A formulation based on the CLD model was proposed for a safe design of the alloy as a structural pre-stressing element under a high-cycle fatigue loading regime.
KW - Fatigue failure criteria
KW - Fe-Mn-Si SMA
KW - High-cycle fatigue design
KW - Phase transformation
KW - Prestressed strengthening
KW - Shape memory alloy (SMA)
UR - http://www.scopus.com/inward/record.url?scp=85026875409&partnerID=8YFLogxK
U2 - 10.1016/j.matdes.2017.07.055
DO - 10.1016/j.matdes.2017.07.055
M3 - Article
AN - SCOPUS:85026875409
VL - 133
SP - 349
EP - 362
JO - Materials and design
JF - Materials and design
SN - 0264-1275
ER -