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Numerical analysis of a new SMA-based seismic damper system and material characterization of two commercial NiTi-alloys

  • Olsen, J.S. (Norwegian University of Science and Technology) ;
  • Van der Eijk, C. (SINTEF Materials and Chemistry) ;
  • Zhang, Z.L. (Norwegian University of Science and Technology)
  • Received : 2007.03.01
  • Accepted : 2001.09.01
  • Published : 2008.03.25
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Abstract

The work presented in this paper includes material characterisation and an investigation of suitability in seismic dampers for two commercially available NiTi-alloys, along with a numerical analysis of a new damper system employing composite NiTi-wires. Numerical simulations of the new damper system are conducted, using Brinson's one-dimensional constitutive model for shape memory alloys, with emphasis on the system's energy dissipation capabilities. The two alloys tested showed some unwanted residual strain at temperatures higher than $A_f$, possibly due to stress concentrations near inclusions in the material. These findings show that the alloys are not ideal, but may be employed in a seismic damper if precautions are made. The numerical investigations indicate that using composite NiTi-wires in a seismic damper enhances the energy dissipation capabilities for a wider working temperature range.

Keywords

References

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