| METALS AND METAL MATRIX COMPOSITES |
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| Effect of Loading Frequency on the Interactions Among Phase Transformation, Plasticity and Heat Transfer in Cyclic Compression of NiTi Shape Memory Alloys |
| ZHANG Kuo1, LI Mingpeng2, ZHOU Guoan1, ZHANG Lingyun3,*
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1 Department of Mechanical and Aerospace Engineering, The Hong Kong University of Science and Technology, Hong Kong 999077, China
2 School of Civil Engineering, Wuhan University, Wuhan 430000, China
3 School of Intelligent Manufacturing, Guangdong Eco-engineering Polytechnic, Guangzhou 510000, China |
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Abstract Displacement-controlled cyclic compressive responses of polycrystalline super-elastic NiTi shape memory alloyswere investigated at a maximum strain of 4.2% and over frequency ranging from 0.000 7 Hz to 50 Hz in stagnant air. The study focused on the interactions among three mechanisms:phase transformation (PT), plastic flow of austenite phase and heat transfer. Temperature oscillations recorded by thermography technique were synchronized with the evolutions of stress-strain relations. It is found that for a given strain, there is a critical frequency, below which the thermomechanical responses are dominated by the frequency dependent coupling between pure PT and heat transfer and above which the macroscopic plastic deformation of austenite phase gets involved in the transient stage of the cycling and interacts with PT and heat transfer. This finding provides an important reference for us to understand the performance of NiTi shape memory alloys under dynamic loading conditions.
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Published: 25 May 2025
Online: 2025-05-13
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2025, Vol. 39 
