https://doi.org/10.1051/epjconf/201818302054
Nickel-titanium pseudo-elastic behavior under equi-biaxial dynamic loading conditions
1
LMT, ENS Paris-Saclay / Université Paris-Saclay / CNRS,
61 avenue du Président Wilson
94230
Cachan,
France
2
UFR Ingénierie, Université Pierre et Marie Curie, Sorbonne Universités,
Paris
* e-mail: quillery@lmt.ens-cachan.fr
Published online: 7 September 2018
Shape memory alloys (SMA) undergo a solid-solid phase transformation called martensitic transformation, involving a "high temperature" phase (austenite) and a "low temperature" phase (martensite). The stress-strain pseudo-elastic behavior of a nickel-titanium under equi-biaxial dynamic compression is measured thanks to a new home-made impact testing set-up using split Hopkinson bars. The use of thermal and optical cameras allows strain and heating sources fields to be identified. The stress field is estimated by the combination of the strain gauges information placed on bars, and a finite element analysis of the specimen. Experimental average stress-strain behavior and thermal emission are finally compared to the results of a finite difference axisymmetric model where the constitutive law is given by a fully coupled stochastic multi scale model.
© The Authors, published by EDP Sciences, 2018
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
