Fatigue behavior of a Fe-Mn-Si shape memory alloy used for
, E. Hosseini
Empa, Swiss Federal Laboratories for Material Science and Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland
Swinburne University of Technology, VIC 3122, Hawthorn, Melbourne, Australia
Inspire Centre for Mechanical Integrity, c/o Empa, CH-8600 Dübendorf, Switzerland
re-fer AG, Oelistrasse 6, CH-6440 Brunnen, Switzerland
University of Tehran, 16th Azar Street, Tehran, Iran
• High-cycle fatigue (HCF) behavior of an
iron-based shape memory alloy (Fe-
SMA) is studied.
• The alloy can be activated and used for
prestressed strengthening of structures.
• A transformation-induced relaxation
(TIR) during cyclic loading results in a
• A constant life diagram (CLD) model is
presented to predict the fatigue limit of
the alloy at different stress ratios.
• A formulation is proposed for a safe de-
sign of the alloy under HCF loading.
Received 19 May 2017
Received in revised form 3 July 2017
Accepted 25 July 2017
Available online 29 July 2017
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 wereperformed 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 be-
havior 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 re-
covery 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. Fur-
thermore, 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.
© 2017 Elsevier Ltd. All rights reserved.
Shape memory alloy (SMA)
High-cycle fatigue design
Fatigue failure criteria
Shape memory alloys (SMAs) are materials that have the capability
to recover their shape (after they have been deformed at a certain
Materials and Design 133 (2017) 349–362
⁎ Corresponding author at: Empa, Swiss Federal Laboratories for Material Science and
Technology, Überlandstrasse 129, CH-8600 Dübendorf, Switzerland.
E-mail address: email@example.com (E. Ghafoori).
0264-1275/© 2017 Elsevier Ltd. All rights reserved.
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