Experimental investigation of the pseudoelastic behaviour of NiTi wires under strain- and stress-controlled cyclic tensile loadings

Ons Ammar (1) , Nader Haddar (1) , Lamine Dieng (2)

1 Laboratoire Génie des Matériaux et Environnement
2 IFSTTAR/MAST/SMC - Structures Métalliques et à Cables

Pseudoelastic NiTi based shape memory alloys (SMA) wires have a good potential in civil engineering applications and often used as dampers in anti-seismic or cable structures when a rate varied cyclic loadings is applied. In accordance with these applications, an experimental characterization of NiTi wires under strain- and stress-controlled cyclic loadings at various strain rates is presented. Based on these loadings, it is shown that the stress-strain response of the material evolves up to a complete stabilization with the increase of the number of cycles. This evolution is accompanied with the degeneration of pseudoelasticity and transformation ratcheting in the case of strain- and stress-controlled mode, respectively. Also, it was found that the cyclic deformation of pseudoelastic NiTi SMA is significantly rate dependent.

Mots clés: PSEUDOELASTIC NITI; STRAIN RATE DEPENDENCE; RATCHETING; DEGENERATION; CYCLIC LOADING-UNLOADING

Mots clés: NITI PSEUDOELASTIQUE; CHARGEMENT ET DECHARGEMENT CYCLIQUES; DEGENERESCENCE; DEPENDANCE DU TAUX DE DEFORMATION; FERMETURE A CLIQUET; MATERIAU

Domaines: Matériaux

Ons Ammar, Nader Haddar, Lamine Dieng. Experimental investigation of the pseudoelastic behaviour of NiTi wires under strain- and stress-controlled cyclic tensile loadings. Intermetallics, 2017, 81 (2), pp.52-61. ⟨10.1016/j.intermet.2017.03.002⟩. ⟨hal-01682621⟩