Structural Engineering and Mechanics

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Buckling and postbuckling behavior of solid superelastic shape memory alloy shafts

  • Rahman, Muhammad Ashiqur (Department of Mechanical Engineering, Bangladesh University of Engineering & Technology) ;
  • Qiu, Jinhao (Institute of Fluid Science, Tohoku University) ;
  • Tani, Junji (Institute of Fluid Science, Tohoku University)
  • Received : 2005.02.24
  • Accepted : 2006.03.15
  • Published : 2006.07.10
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Abstract

Observing the unique stress-strain curves of the superelastic shape memory alloy (SMA) in tension and compression, the primary intention of this study is to investigate the behavior of the shafts made of the same material, under torsional loading-unloading cycles for large angle of twist. Experiments have been performed for the superelastic SMA shafts with different unsupported lengths and angles of twist and the results are compared with those of stainless steel (SUS304) shafts under similar test conditions. As expected for the superelastic SMA, the residual strains are small enough after each cycle and consequently, the hysteresis under loading-reverse loading is much narrower than that for the SUS304. For large angle of twists, the torsional strength of the superelastic SMA increases nonlinearly and exceeds that of SUS304. Most interestingly, the slender solid superelastic SMA shafts are found to buckle when acted upon torsion for large angle of twist.

Keywords

References

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  2. Nonlinear tension-bending deformation of a shape memory alloy rod vol.21, pp.11, 2012, https://doi.org/10.1088/0964-1726/21/11/115004
  3. Effect of Cross Section Geometry on the Response of an SMA Column vol.19, pp.2, 2008, https://doi.org/10.1177/1045389X06075028
  4. Nonlinear analysis of cantilever shape memory alloy beams of variable cross section vol.16, pp.2, 2007, https://doi.org/10.1088/0964-1726/16/2/035