Peculiarities of fatigue fracture of shape memory alloy at different load frequency

Keywords

shape memory alloys, low-cycle fatigue, dissipated energy, fracture mechanism.

Cite as

Iasnii V. P., Krechkovskа H. V., Budz V. I., and Student O. Z. Peculiarities of fatigue fracture of shape memory alloy at different load frequency. Physicochemical Mechanics of Materials. 2023. 59(4), 23-31.

https://doi.org/10.15407/pcmm2023.04.023

Abstract

The features of fracture of shape memory alloy samples (nitinol) under low-cycle fatigue with different load frequencies (0.1; 1 and 10 Hz) were investigated. The frequency depen­dences of such indicators as the number of cycles before the fracture of samples, the maxi­mum and residual deformation before and after their fracture, respectively, were analyzed. It was established that the maximum value of the dissipated energy in the load cycle decreases with an increase of frequency from 0.1 to 10 Hz. It is shown fractographically that the mechanism of fatigue failure of specimens depends on the frequency of loading. At high frequency at the nitinol fracture surface classical fatigue striations decorated with secondary cracks dominated. While at low frequency, a special type of striated relief was found with alternating changes in the striation spacing and the orientation of shear planes, in which a local crack growth occurred in the loading cycle. Their appearance is explained by phase transformations inherent in nitinol, due to the rearrangement of its crystal lattice at the crack tip with multiple direct and reverse phase transformations (austenite ® martensite ® austenite) occurring in half-cycles of loading and unloading of samples, respectively.

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