Experimental and theoretical investigation of the frequency effect on low cycle fatigue of shape memory alloys

2017 ◽  
Vol 90 ◽  
pp. 1-30 ◽  
Author(s):  
Yahui Zhang ◽  
Yajun You ◽  
Ziad Moumni ◽  
Gunay Anlas ◽  
Jihong Zhu ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Theoretical Investigation ◽  
Low Cycle Fatigue ◽  
Frequency Effect ◽  
Cycle Fatigue

Modeling of Internal Damage Evolution During Actuation Fatigue in Shape Memory Alloys

2018 ◽  
Author(s):  
Francis R. Phillips ◽  
Daniel Martin ◽  
Dimitris C. Lagoudas ◽  
Robert W. Wheeler
Keyword(s):  
Phase Transformation ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Damage Evolution ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Internal Damage ◽  
Functional Fatigue ◽  
Non Linear

Shape memory alloys (SMAs) are unique materials capable of undergoing a thermo-mechanically induced, reversible, crystallographic phase transformation. As SMAs are utilized across a variety of applications, it is necessary to understand the internal changes that occur throughout the lifetime of SMA components. One of the key limitations to the lifetime of a SMA component is the response of SMAs to fatigue. SMAs are subject to two kinds of fatigue, namely structural fatigue due to cyclic mechanical loading which is similar to high cycle fatigue, and functional fatigue due to cyclic phase transformation which typical is limited to the low cycle fatigue regime. In cases where functional fatigue is due to thermally induced phase transformation in contrast to being mechanically induced, this form of fatigue can be further defined as actuation fatigue. Utilizing X-ray computed microtomography, it is shown that during actuation fatigue, internal damage such as cracks or voids, evolves in a non-linear manner. A function is generated to capture this non-linear internal damage evolution and introduced into a SMA constitutive model. Finally, it is shown how the modified SMA constitutive model responds and the ability of the model to predict actuation fatigue lifetime is demonstrated.

scholarly journals Phase transformation volume amplitude as a low-cycle fatigue indicator in nickel–titanium shape memory alloys

2020 ◽  
Vol 178 ◽  
pp. 442-446 ◽  
Author(s):  
Harshad M. Paranjape ◽  
Bill Ng ◽  
Ich Ong ◽  
Lot Vien ◽  
Christopher Huntley
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Low Cycle Fatigue ◽  
Nickel Titanium ◽  
Cycle Fatigue

Multiscale TRIP-based investigation of low-cycle fatigue of polycrystalline NiTi shape memory alloys

2019 ◽  
Vol 115 ◽  
pp. 307-329 ◽  
Author(s):  
Yahui Zhang ◽  
Ziad Moumni ◽  
Yajun You ◽  
Weihong Zhang ◽  
Jihong Zhu ◽  
...  
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue ◽  
Niti Shape Memory Alloys

Low-Cycle Fatigue Behavior of Copper Zinc Aluminum Shape Memory Alloys

1999 ◽  
pp. 337-344 ◽  
Author(s):  
A. Subramaniam ◽  
N. Rajapakse ◽  
D. Polyzois ◽  
B. Yue
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Low Cycle Fatigue ◽  
Fatigue Behavior ◽  
Cycle Fatigue ◽  
Copper Zinc

Modeling of torsion fatigue in shape memory alloys

2019 ◽  
Vol 30 (20) ◽  
pp. 3146-3162 ◽  
Author(s):  
Mohammad Reza Mohammadzadeh ◽  
Mahmoud Kadkhodaei ◽  
Mahmoud Barati ◽  
Shabnam Arbab Chirani ◽  
Luc Saint-Sulpice
Keyword(s):  
Fatigue Life ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Current Knowledge ◽  
Low Cycle Fatigue ◽  
Dissipated Energy ◽  
Loading Frequency ◽  
Thermomechanical Model ◽  
Number Of Cycles ◽  
Fatigue Criterion

Fatigue in shape memory alloys is one of the crucial aspects of their behavior; however, the current knowledge is mainly focused on uniaxial fatigue and is inadequate for engineering purposes. In this article, a fatigue criterion based on the stabilized dissipated energy has been presented to investigate the torsional low-cycle fatigue of superelastic shape memory alloys. To this aim, a one-dimensional torsional constitutive model in addition to a modified fully coupled thermomechanical model has been utilized so that the torsional cyclic responses especially in relatively high loading frequencies, which contribute to remarkable temperature variations and consequent response changes, could be taken into account. The calculated stabilized dissipated energy, then, has been used in an energy approach fatigue criterion in order to predict the fatigue life; hence, an explicit relation, which is capable of determining the number of cycles to failure for different loading conditions at a given loading frequency, has been obtained. The numerical results have been appraised for NiTi specimens, and they have been shown to be in a good agreement with the experimental data. Finally, using the proposed approach, the effect of fatigue test parameters on the fatigue life has been studied.

scholarly journals A shakedown analysis of high cycle fatigue of shape memory alloys

2016 ◽  
Vol 87 ◽  
pp. 112-123 ◽  
Author(s):  
F. Auricchio ◽  
A. Constantinescu ◽  
C. Menna ◽  
G. Scalet
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
High Cycle Fatigue ◽  
Cycle Fatigue ◽  
Shakedown Analysis

Low-Cycle Fatigue of TiNi Shape Memory Alloy and Formulation of Fatigue Life.

1998 ◽  
Vol 64 (626) ◽  
pp. 2548-2554
Author(s):  
Takahiro HASHIMOTO ◽  
Hisaaki TOBUSHI ◽  
Takafumi NAKAHARA ◽  
Yoshirou SHIMENO
Keyword(s):  
Fatigue Life ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Low Cycle Fatigue ◽  
Cycle Fatigue

scholarly journals Rotary bending fatigue analysis of shape memory alloys

2017 ◽  
Vol 29 (6) ◽  
pp. 1183-1195 ◽  
Author(s):  
Maede Hesami ◽  
Laurent Pino ◽  
Luc Saint-Sulpice ◽  
Vincent Legrand ◽  
Mahmoud Kadkhodaei ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Low Cycle Fatigue ◽  
Dissipated Energy ◽  
Uniaxial Tensile ◽  
Temperature Phase ◽  
Stress Plateau ◽  
Bending Fatigue ◽  
Numerical Predictions

In this work, a one-dimensional constitutive model is used to study rotary bending fatigue in shape memory alloy beams. The stress and strain distributions in a beam section are driven numerically for both pure bending and rotary bending to show the basic differences between these two loading types. In order to verify the numerical results, experiments are performed on NiTi specimens with an imposed bending angle using a bending apparatus. Since the specimens show significant stress plateau for forward and backward transformation in their stress–strain response, an enhanced stress–temperature phase diagram is proposed in which different slopes are considered for the start and finish of each transformation strip. In order to study low cycle fatigue of shape memory alloys during rotary bending, the stabilized dissipated energy is calculated from numerical solution. A power law for variations of the fatigue life with the stabilized dissipated energy is obtained for the studied specimens to predict their fatigue life. The numerical predictions of the present approach are shown to be in a good agreement with the experimental findings for rotary bending fatigue. Uniaxial tensile fatigue tests are further performed on the studied specimens to investigate effect of loading type on the fatigue lifetime.

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