UNIFORM OR LOCALIZED PURE BENDING DEFORMATION OF SUPERELASTIC NiTi THIN WIRES

Gabriel Antherieu (1, 2) , Nathanael Connesson (2) , Pierre Mozer (3, 4) , Yohan Payan (1) , Denis Favier (2)

1 TIMC-IMAG-GMCAO - Gestes Medico-chirurgicaux Assistés par Ordinateur
2 TIMC-IMAG-BioMMat - Ingénierie Biomédicale et Mécanique des Matériaux
3 ISIR - Institut des Systèmes Intelligents et de Robotique
4 AGATHE - Assistance aux Gestes et Applications THErapeutiques

Most medical applications involving superelastic Ni-Ti shape memory alloys are based on thin wires or tubes. If the tensile behavior of such specimens has been extensively described in the literature, only few studies deal with their mechanical behavior under pure bending and compressive load [1]. In this paper, Ni-Ti wire behaviors were experimentally investigated using pure bending and uni-axial tensile experiments. Uniform or localized behaviors were observed depending on the thermo-mechanical treatment of the wire. Theoretical bending model was proposed. For nonlocalized tests, it allowed to analyze tension-compression asymmetry. Tension and compression constitutive equations were proposed to model localization in bending.

Domaines: Biomécanique [physics.med-ph]; Ingénierie biomédicale; Biomécanique [physics.med-ph]

Gabriel Antherieu, Nathanael Connesson, Pierre Mozer, Yohan Payan, Denis Favier. UNIFORM OR LOCALIZED PURE BENDING DEFORMATION OF SUPERELASTIC NiTi THIN WIRES. 24th International Congress of Theoretical and Applied Mechanics, ICTAM'2016, Aug 2016, Montreal, Canada. ⟨hal-01404122⟩