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Prediction of Shape Recovery for Ni-Ti SMA Wire after Drawing

Ni-Ti 형상기억합금 선재의 인발 공정 후 형상회복 예측에 관한 연구

  • Received : 2013.07.30
  • Accepted : 2013.11.04
  • Published : 2013.12.01

Abstract

The aim of the current study was to predict shape recovery behavior of Ni-Ti shape memory alloy (SMA) wire after loading-unloading and after wire drawing. The superelasticity of SMA was analyzed by a hyper-elastic model for the Mullins effect using ABAQUS. Firstly, tensile tests and loading-unloading tests of the Ni-Ti SMA wire with a diameter 1.0 mm were performed using an MTS servo-hydraulic tester. The parameters for the Mullins effect were computed by ABAQUS based on curve-fitting of the loading-unloading test data. The proposed FE-model predicted the shape recovery of Ni-Ti SMA after wire drawing. Finally, the effectiveness of the model was verified by drawing experiments. The wire drawing experiments using the Ni-Ti SMA were conducted on a drawing machine(1ton, 50mm/s). In order to evaluate the shape recovery of Ni-Ti SMA, the drawn wires are annealed for 30min at $450^{\circ}C$.

Keywords

Shape Memory Alloy;Ni-Ti Alloy;Hyper-Elasticity;Mullins Effect;Wire Drawing

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Acknowledgement

Supported by : 부산대학교