Damage evolution in pseudoelastic polycrystalline Co–Ni–Ga high-temperature shape memory alloys

2015 ◽  
Vol 633 ◽  
pp. 288-295 ◽  
Author(s):  
Malte Vollmer ◽  
Philipp Krooß ◽  
Christian Segel ◽  
Anja Weidner ◽  
Alexander Paulsen ◽  
...  
2020 ◽  
Vol 794 ◽  
pp. 139857 ◽  
Author(s):  
O. Karakoc ◽  
K.C. Atli ◽  
A. Evirgen ◽  
J. Pons ◽  
R. Santamarta ◽  
...  

Author(s):  
Francis R. Phillips ◽  
Daniel Martin ◽  
Dimitris C. Lagoudas ◽  
Robert W. Wheeler

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.


Metals ◽  
2017 ◽  
Vol 7 (11) ◽  
pp. 511 ◽  
Author(s):  
Matthew Carl ◽  
Jesse Smith ◽  
Brian Van Doren ◽  
Marcus Young

2020 ◽  
Vol 9 (5) ◽  
pp. 9972-9984 ◽  
Author(s):  
I. López-Ferreño ◽  
J.F. Gómez-Cortés ◽  
T. Breczewski ◽  
I. Ruiz-Larrea ◽  
M.L. Nó ◽  
...  

2021 ◽  
Vol 30 (3) ◽  
pp. 035027
Author(s):  
Deyan Kong ◽  
Jie Li ◽  
Anru Guo ◽  
Jianxin Yu ◽  
Xinli Xiao

Sign in / Sign up

Export Citation Format

Share Document