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Experimental Study on Temperature Effects on NiTi Shape Memory Alloys under Fatigue Loading.
Caikui Lin1, Zeqiang Wang2, Xin Yang3
1School of Civil Engineering, Wuhan University, Wuhan 430072, China.
Fatigue life of Nickel-Titanium Shape Memory Alloys (SMAs) shortens with increasing temperature above Austenite finish temperature, impacting vibration control systems. Higher temperatures reduce energy consumption but increase hysteresis, stress, and modulus.
Area of Science:
- Materials Science
- Mechanical Engineering
- Structural Dynamics
Background:
- Nickel-Titanium Shape Memory Alloys (SMAs) are crucial for structural vibration control.
- SMA fatigue life is a critical parameter for effective vibration control system performance.
Purpose of the Study:
- To investigate the influence of temperature and strain amplitude on the fatigue properties of NiTi SMAs.
- To analyze key fatigue parameters under varying thermal and mechanical conditions.
Main Methods:
- Fatigue testing was conducted using a Dynamic Mechanical Analyzer (DMA + 1000).
- Tests were performed to evaluate the impact of temperature and strain amplitude on SMA fatigue behavior.
Main Results:
- SMA fatigue properties are significantly affected by temperature above the Austenite finish temperature (Af).
- Increasing temperature leads to reduced fatigue life and energy consumption.
- Higher temperatures result in increased hysteresis curve area, stress amplitude, and effective modulus.
Conclusions:
- Temperature is a critical factor influencing NiTi SMA fatigue performance, particularly above Af.
- Understanding these temperature-dependent fatigue characteristics is essential for optimizing SMA-based vibration control systems.
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