Two constitutive models representative of two well-known modeling techniques for shape memory materials were reviewed. The first model was proposed by Kim and Aberayatne in the framework of finite thermo-elasticity with non-convex energy [1]. The second model, based on a phenomenological approach, was developed by Auricchio et. al. within the theory of irreversible thermodynamics with internal variables [2]. Both models are temperature and strain rate dependent and they take into account thermal effects. Quasistatic tensile tests were conducted on superelastic NiTi wires at different temperatures to identify the material parameters. The two models were numerically implemented and their stress-strain responses were compared with the experimental data obtained in tensile tests performed at different strain rates [3]. These results will be applied to the design of a prototypal anti-seismic device implementing superelastic wires.
Comparative assessment of two constitutive models for shape memory alloys
CHIOZZI, Andrea;MERLIN, Mattia;RIZZONI, Raffaella;TRALLI, Antonio Michele
2012
Abstract
Two constitutive models representative of two well-known modeling techniques for shape memory materials were reviewed. The first model was proposed by Kim and Aberayatne in the framework of finite thermo-elasticity with non-convex energy [1]. The second model, based on a phenomenological approach, was developed by Auricchio et. al. within the theory of irreversible thermodynamics with internal variables [2]. Both models are temperature and strain rate dependent and they take into account thermal effects. Quasistatic tensile tests were conducted on superelastic NiTi wires at different temperatures to identify the material parameters. The two models were numerically implemented and their stress-strain responses were compared with the experimental data obtained in tensile tests performed at different strain rates [3]. These results will be applied to the design of a prototypal anti-seismic device implementing superelastic wires.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
