Multiple stress plateaus during complex mechanical cycling of pseudo elastic NiTi wires

Wagner, M.; Eggeler, G.

doi:10.1361/cp2006smst579

Multiple stress plateaus during complex mechanical cycling of pseudo elastic NiTi wires (bibtex)

by M. Wagner, G. Eggeler

Abstract:

The present study addresses the origin of multiple stress plateaus in the stress strain data obtained from complex mechanical cycling experiments. We present typical experimental results on cycling with constant strain amplitudes, increasing strain amplitudes, and internal loop cycling. We briefly discuss the different processes associated with mechanical cycling which occur simultaneously on three length scales: Microstructural changes, deformation on the mesoscale, and macroscopic responses of the tensile specimens. We demonstrate that the seemingly complex fatigue behavior of pseudo elastic NiTi can be rationalized by a simple scenario which explicitly considers localization of the stress-induced martensitic transformation - and therefore localization of functional fatigue - due to Lüders-like deformation.

Reference:

Wagner, M., Eggeler, G.: Multiple stress plateaus during complex mechanical cycling of pseudo elastic NiTi wires, Proc. of SMST 2006, 579-587.

Bibtex Entry:

@InProceedings{Wagner,
  Title                    = {{Multiple stress plateaus during complex mechanical cycling of pseudo elastic NiTi wires}},
  Author                   = {Wagner, M. and Eggeler, G.},
  Booktitle                = {Proc. of SMST 2006},
  Year                     = {2006},
  Pages                    = {579--587},

  Abstract                 = {The present study addresses the origin of multiple stress plateaus in the stress strain data obtained from complex mechanical cycling experiments. We present typical experimental results on cycling with constant strain amplitudes, increasing strain amplitudes, and internal loop cycling. We briefly discuss the different processes associated with mechanical cycling which occur simultaneously on three length scales: Microstructural changes, deformation on the mesoscale, and macroscopic responses of the tensile specimens. We demonstrate that the seemingly complex fatigue behavior of pseudo elastic NiTi can be rationalized by a simple scenario which explicitly considers localization of the stress-induced martensitic transformation - and therefore localization of functional fatigue - due to L\"{u}ders-like deformation.},
  Doi                      = {10.1361/cp2006smst579}
}