Nickel-titanium pseudo-elastic behavior under equi-biaxial dynamic loading conditions

Abstract : 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. This transformation can be activated by thermal loading (heating or cooling) or mechanical loading (stress) and explains for example the pseudo-elastic phenomenon where high reversible deformation (>6%) can be reached during a tensile loading. Although the uniaxial dynamic pseudoelastic behavior of SMA is relatively well documented today, this behavior under multiaxial stress remains unknown. Such knowledge is however essential for the validation of multiaxial models to democratize the use of these materials. The stress-strain pseudo-elastic behavior of a Nickel-Titanium under equi-biaxial dynamic compression is addressed in this work. It is measured thanks to a new homemade equi-biaxial impact testing setup using split Hopkinson bar. The use of thermal and optical camera allows strain and heating sources fields to be identified. The stress field is estimated by combining the strain gauges information placed on a coaxial transmitted bar and a transmitted tube and a finite element analysis of the specimen. The deformation appears homogeneous in the biaxial loading region of interest where a significant rise in temperature due to the phase change latent heat is observed. The dynamic testing allows on the other hand an equivalent dynamic stress/strain curve under biaxial and quasi-adiabatic conditions to be plotted. Experiments are finally compared to the results of finite difference axisymmetric model where the constitutive law is given by a fully coupled stochastic multiscale model.
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Pierre Quillery, Bastien Durand, Olivier Hubert, Han Zhao. Nickel-titanium pseudo-elastic behavior under equi-biaxial dynamic loading conditions. Colloque MECAMAT Aussois 2019, Jan 2019, Aussois, France. ⟨hal-02157456⟩

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