Study on Interference Connection Based on Shape Recovery of NiTiNb Shape Memory Alloy
Abstract
:1. Introduction
2. Materials and Methods
2.1. Numerical Simulation of Interference Connection
2.1.1. Model Creation
2.1.2. Material Properties
2.1.3. Parameter Setting
2.2. Experiment of Interference Connection
2.2.1. Materials
2.2.2. Tensile Pre-Deformation
2.2.3. Heating Recovery
2.2.4. Interference Connection
2.2.5. Interference Force Measurement
3. Results and Discussions
3.1. Analysis of Numerical Simulation Stress
3.2. Analysis of Numerical Simulation Strain
3.3. Analysis of Interference Force
4. Conclusions
- (1)
- The results of numerical simulation show that the method of interference connection using SMA can achieve large interference fit size connection, and the maximum interference fit size with aluminum alloy connecting plate was about 2.5%. There was no bump in the resulting interference connection. There was a stress concentration at the root of the bolt, and the stress distribution of the hole wall was uniform.
- (2)
- When the interference fit size was less than 1%, the connection hole had elastic deformation. When the interference fit size was 1.5%, the hole wall had plastic deformation. When the interference fit size was 2.5%, the maximum stress on the connecting plate was close to the tensile limit of the material. If the interference fit size continues to increase, the strength of the connection structure will be damaged.
- (3)
- The results of the interference connection test show that there was no bump after the interference connection was completed. The interference force was calculated by pulling-off force, and the interference force increased with the increase in interference fit size. Compared with the results of finite element analysis, the change trend of the interference force is basically the same, and the error is less than 13%, which verifies the rationality of the finite element simulation.
Author Contributions
Funding
Conflicts of Interest
References
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Material | Property | Value |
---|---|---|
NiTiNb | Austenite transformation As′ | 63 °C |
Austenite transformation Af′ | 125 °C | |
Maximum recoverable strain | 7% | |
Modulus of elasticity E | 89,088 MPa | |
Poisson ratio v | 0.39 | |
Yield strength σs | 520 MPa | |
Aluminium alloy 6061-T651 | Modulus of elasticity E | 72,000 MPa |
Poisson ratio v | 0.33 | |
Yield strength σs | 240 MPa | |
Friction factor μ | 0.15 |
Interference Fit Size | 0.5% | 1% | 1.5% | 2% | 2.5% | 3.2% |
Shaft d/mm | 7.544 | |||||
Hole D/mm | 7.752 | 7.714 | 7.676 | 7.638 | 7.601 | 7.544 |
Modulus of Elasticity | Yield Strength | Breaking Strength | Percentage Elongation |
---|---|---|---|
87 GPa | 800 MPa | 500 MPa | 30% |
Number | Before Tension | After Tension | After Recovery | Recovery Rate | ||||
---|---|---|---|---|---|---|---|---|
Length/mm | Diameter/mm | Length/mm | Diameter/mm | Length/mm | Diameter/mm | Length/mm | Diameter/mm | |
1 | 60.23 | 7.97 | 67.46 | 7.53 | 64.28 | 7.71 | 5.27 | 2.26 |
2 | 60.39 | 7.99 | 67.53 | 7.52 | 64.59 | 7.69 | 4.87 | 2.12 |
3 | 60.18 | 8.00 | 67.61 | 7.54 | 64.35 | 7.73 | 5.42 | 2.39 |
4 | 60.56 | 8.01 | 67.59 | 7.54 | 64.48 | 7.72 | 5.14 | 2.25 |
5 | 59.89 | 7.97 | 67.49 | 7.53 | 64.37 | 7.69 | 5.21 | 2.01 |
6 | 60.31 | 7.99 | 67.42 | 7.51 | 64.41 | 7.68 | 4.99 | 2.13 |
Interference Fit Size | 0.5% | 1% | 1.5% | 2% | 2.39% |
Shaft d/mm | 7.54 | ||||
Hole D/mm | 7.69 | 7.65 | 7.61 | 7.57 | 7.54 |
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Niu, H.; Sun, Y.; Lin, C.; Zou, Y. Study on Interference Connection Based on Shape Recovery of NiTiNb Shape Memory Alloy. Materials 2021, 14, 2328. https://doi.org/10.3390/ma14092328
Niu H, Sun Y, Lin C, Zou Y. Study on Interference Connection Based on Shape Recovery of NiTiNb Shape Memory Alloy. Materials. 2021; 14(9):2328. https://doi.org/10.3390/ma14092328
Chicago/Turabian StyleNiu, Haojie, Yubin Sun, Chengxin Lin, and Yutang Zou. 2021. "Study on Interference Connection Based on Shape Recovery of NiTiNb Shape Memory Alloy" Materials 14, no. 9: 2328. https://doi.org/10.3390/ma14092328