Thermomechanical behavior of shape memory alloy under complex loading conditions

Training and two-way shape memory in NiTi alloys: influence on thermal parameters

“…Engineering science has helped to improve the effective design and use of these materials in a number of devices. A lot of theoretical modelling has been carried out to analyse the thermomechanical effect using suitable constitutive equations [5][6][7], which are introduced in finite element simulations. From an experimental point of view, several groups have considered the efficiency of different training methods such as shape memory, pseudoelastic, thermal cycling under a constant stress or martensite over-deformation training, in order to obtain the maximum two-way memory strain with respect to training strain [8][9][10][11].…”

Theoretical and numerical modeling of solid–solid phase change: Application to the description of the thermomechanical behavior of shape memory alloys

“…Validation in the case of multi-axial loading This paragraph is devoted to the validation of the modeling in the case of multi-axial loading. To this end, numerical simulation of a multi-axial experiment realized by Tokuda et al (1999) is performed.…”

“…A stress and strain vectors are also defined; r ¼ ðr; C 1 sÞ and e ¼ ðe; C 2 cÞ. The coefficients C 1 and C 2 are material constants to adjust the relation between shear stress s and shear strain c to the relation between the stress r and strain e (Sittner et al, 1995;Tokuda et al, 1999). In the material used, C 1 ¼ 1:2 and C 2 ¼ 0:5 (Tokuda et al, 2002).…”

Analysis of a thermally induced phase transformation strain state for the TiNi shape memory alloy under a complex stress state

“…The majority of the reported results of mechanical testing of the SMAs was carried out in uniaxial stress states [2][3][4][5] rather than under complex stress conditions [6,7]. On the other hand, testing in complex stress states becomes a crucial point in theoretical modelling.…”