Roundrobin SMA modeling

Abstract

Abstract. This article reports on an ESF S3T EUROCORES sponsored networking activity called Roundrobin SMA modeling organized with the aim to compare capabilities of various thermomechanical models of shape memory alloys capable to simulate their functional responses for applications in smart engineering structures. Five sets of experimental data were measured in thermomechanical tests on thin NiTi filament in tension, torsion and combined tension/torsion. The data were provided to six teams developing advanced SMA models to perform appropriate simulations. Simulation results obtained by individual teams were compared with experimental results and presented on a dedicated Roundrobin SMA modeling website. The evaluation of the activity in terms of the assessment of the capability of individual models to deal with specific features of the experimentally measured SMA thermomechanical responses is provided in this article.

Active shape/stress control of shape memory alloy laminated beams

“…In order to examine the accuracy of the present SMA model, predictions of the model are compared with experimental data available in the open literature [18]. After verifying the proposed model, novel numerical results are presented to provide an insight into the influence of pre-strain, temperature and location of SMA layer on active shape/stress control of SMA laminated beams subjected to various thermo-mechanical loading paths.…”

Phase Transformation of Anisotropic Shape Memory Alloys: Theory and Validation in Superelasticity

“…The tension-compression asymmetry is observable not only on the critical stress to trigger the martensitic transformation, but also on the stress-temperature slopes of the phase diagram and on the magnitude of transformation strains [4]. The behavior of processed SMAs also shows a strong anisotropic behavior [5,6]. Like other metals, the texture of the material and the presence of internal stresses are found to be responsible for such anisotropy.…”

A phenomenological SMA model for combined axial–torsional proportional/non-proportional loading conditions

“…The results revealed the strong non-linear material response and the response path dependencies, highlighting the presence of reorientation processes for complex loading paths with respect to pseudoelasticity and the shape memory effect. Most recently, a large experimental dataset of combined tension-torsion tests on thin NiTi wires has been obtained in frame of SMA Roundrobin modeling initiative carried out within the S3T EUROCORES program [17].…”