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16 June 2023 Study on the dynamic response of TiNi alloy fixed beam under impact loading
Huimin Wu
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Proceedings Volume 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023); 126392G (2023) https://doi.org/10.1117/12.2682093
Event: Third International Conference on Mechanical Design and Simulation (MDS 2023), 2023, Xi'an, China
Abstract
As TiNi alloy is in the pseudo elastic state, the stress-strain curve has a large hysteresis, which can consume energy and return to the origin after unloading without residual deformation. To study the energy absorption mechanism of TiNi alloy fixed beam under impact load, a drop hammer experiment was carried out. The experimental results show that under the impact of the drop hammer, the elastic bending wave is first generated at the impact point, and then propagates and reflects in the beam. Gradually, large deformation and phase transformation occur at the midpoint and fixed end of the beam, forming a phase transformation hinge. The rest of the beam rotates around the midpoint and fixed end. The axial force in the beam becomes the main factor of response. When the drop hammer speed is zero, the unloading phase is started. The elastic strain energy generated by axial force will make the drop hammer move upward and the speed will increase gradually. During the impact process, the energy dissipation is mainly completed by the phase change hinge. More energy is stored in the TiNi alloy fixed beam by the elastic strain energy generated by the axial force. The energy dissipation tends to increase with the increase of input energy.
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Huimin Wu "Study on the dynamic response of TiNi alloy fixed beam under impact loading", Proc. SPIE 12639, Third International Conference on Mechanical Design and Simulation (MDS 2023), 126392G (16 June 2023); https://doi.org/10.1117/12.2682093
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KEYWORDS
Alloys
Deformation
Elasticity
Shape memory alloys
Wave propagation
Absorption
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