The mechanical loading frequency affects the functional properties of shape memory alloys (SMA). Thus, it is necessary to study effect in order use successfully these materials real structures. Based on pseudoelastic cyclic behavior, experimental methodology that allows testing NiTi wires stress controlled mode proposed. Cyclic tensile tests are carried out using universal machine STM-100 at ro...

-A nonlinear finite element procedure is developed which incorporates a thermodynami~ly derived cons~tutive law for shape. memory alloy material behavior. The constitutive equations include the necessary internal variables to account for the material transfo~ations and are utilized in a onedimensional finite element procedure that captures the unique shape memory alloy responses of pseudoelasti...

Pseudoelasticity and the shape memory e ect (SME) due to martensitic transformation and reorientation of polycrystalline shape memory alloy (SMA) materials are modelled using a free energy function and a dissipation potential. Three di erent cases are considered, based on the number of internal state variables in the free energy: (1) Austenite plus a variable number of martensite variants; (2) ...

The effects of the Cr and Sn addition concentrations on cold–workability, phase constituents, mechanical properties, shape memory effect (SME), superelasticity were investigated. A systematic screening ?–Ti alloy, which was slight–alloyed by Sn, executed in this work. Cold–workability Ti–Cr–Sn alloys greatly promoted along with increasing concentration Sn. parent ?–phase successfully stabilized...

Fe–Mn–Si-based shape memory alloys (Fe-SMAs) have attracted much research attention due to their potential applications for vibration mitigation, energy dissipation, and re-centering in the construction sector. Because of crucial impact precipitation on pseudoelasticity (PE) behavior Fe-SMAs, equilibrium phase diagram an Fe–17Mn–5Si–10Cr–4Ni–1(V-C) (wt%) SMA was used this study identify a low-t...

The purpose of this review was to organize a systematic reference to help orthodontists evaluate commonly used orthodontic nickel-titanium alloys. Part I of the article reviews the data available in the literature regarding the temperature transitional ranges of the alloys. The thermomechanical behavior of these compounds is, in fact, strictly dependent on the correlation between the temperatur...

The objective of this work is to understand the structure-property relationships in polycrystalline NiTiPt (Ti 42.7 at.% Ni 7.5 at %Pt) with a composition showing pseudoelasticity at ambient temperatures. Structural characterization of the alloy includes grain size determination and texture analysis while the thermomechanical properties are explored using tensile testing. Variation in heat trea...

Shape memory alloys (SMAs) are a very promising class of metallic materials that display interesting nonlinear properties, such as pseudoelasticity (PE), shape memory effect (SME) and damping capacity, due to high mechanical hysteresis and internal friction. Our group has applied SMA in the field of neuromuscular rehabilitation, designing some new devices based on the mentioned SMA properties: ...