Experimental study on the thermoelastic martensitic transformation in shape memory alloy polycrystal induced by combined external forces

Šittner, Petr; Hara, Yasuhiro; Tokuda, Masataka

doi:10.1007/bf02669649

Cited by 127 publications

(126 citation statements)

References 6 publications

Supporting

Mentioning

120

Contrasting

Order By: Relevance

“…Further, the recoverable twist decreases with increasing imposed recoverable extension in random and h110i texture while h100i texture shows the opposite behavior. Sittner et al [66] have used force control to study stress-induced pseudoelasticity in Cu±Zn±Al±Mn under the combined tension±tor-sion. The maximum recoverable normalized twist is around 1% in their experiment, and it increases with applied tensile loading.…”

Section: Results For Combined Tension±torsionmentioning

confidence: 99%

The influence of texture on the shape-memory effect in polycrystals

1998

View full text Add to dashboard Cite

AbstractÐA model is developed to show that texture is a crucial factor in determining the shape-memory e ect in polycrystals. In particular, it is established that texture is the reason why the strains recoverable in Ti±Ni are so much larger than those in Cu-based shape-memory alloys in rolled, extruded and drawn specimens. Further, it is shown that both these materials recover relatively small strains in sputter-deposited thin ®lms due to unfavorable texture. It is found that even the qualitative behavior of combined tension± torsion can critically depend on the texture. The results are in good agreement with experimental observations. Finally, textures are suggested for improved shape-memory e ect. #

show abstract

Section: Results For Combined Tension±torsionmentioning

confidence: 99%

The influence of texture on the shape-memory effect in polycrystals

1998

View full text Add to dashboard Cite

show abstract

“…This example is experimentally examined and the obtained data are available in literature [1,2]. Tension-torsion experiment of thin wall specimen [8] made of CuAlZnMn alloy is used for this purpose. Axial stress of 240MPa and then the shear stress of 200MPa were applied combined at the same side of cube, while the opposite side is fully constrained.…”

Section: Large Strain Non-proportional Examplementioning

confidence: 99%

“…Material parameters that were used for this simulation are used from the literature [1]. Multiaxial tension-torsion non-proportional loading path is compared with the experimental results [8] and numerical results from the literature [1, 2, 4].…”

Section: Large Strain Non-proportional Examplementioning

confidence: 99%

“…Integration is done for the deviatoric and mean stress using trial stress direction. Constitutive model verification is difficult due to the lack of experimental data, but some experimental results [8] are of great importance. The obtained results of numerical simulations are in close agreement with the results from literature [9] in one dimensional loaded examples of super-elasticity and shape memory.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Implicit Integration Method of Shape Memory Alloys Constitutive Model

Dunić¹,

Slavković²,

Busarac³

et al. 2014

Proceedings of the 3rd South-East European Conference on Computational Mechanics (SEECCM III)

View full text Add to dashboard Cite

Abstract. Shape memory alloys (SMA) material is widely used in many applications of interest where it is necessary to recover permanent strains. There are many constitutive models which describe that phenomenon. The SMA model described by Lagoudas in [1] and [2] is modified and implemented into the PAK software package [3]. Development of this model is motivated by previous papers of Lagoudas and Auricchio groups and it considers governing parameter method applied on phenomenological behavior of SMA materials. All variables are derived to depend on effective values of stress and strain and now we have only one scalar equation to solve in the integration point. Critical thermodynamic force is also modified to match new integration method. Integration is done for the deviatoric and mean stress using trial stress direction for each time step. Difference between the return mapping algorithm and the integration in the trial deviatoric stress direction can be neglected for nearly proportional loading [2]. The second case provide possibility to solve large strain problems in the similar manner, using the same constitutive model relations. One dimensional loaded examples of super-elasticity, shape memory and thermally induced phase transformation effect proposed by Lagoudas group are verified by modified governing parameter method using the PAK software. Several large strain examples are examined under uniaxial and non-proportional loading and the results are compared with the experimental results proposed in referenced papers.

show abstract

“…In order to improve description of the criterion for 3D yield by transformation, stress-induced martensitic transformation was also investigated under multi-axial stress state [26][27][28][34][35]. Lexcellent et al [26] performed combined tension-compression-torsion experiments using NiTi polycrystalline tubular samples as sketched in Figure 7(a).…”

Section: Combined Loadingmentioning

confidence: 99%

Stress state effect on mechanical behaviour of shape memory alloys : Experimental characterisation and modelling

Orgéas

Favier

2001

J. Phys. IV France

View full text Add to dashboard Cite

Abstract. As engineering components utilising the beneficial properties of shape memory alloys (SMA) become geometrically complex and as applications involve combinations of loading states, a full evaluation of the effects of stress state on stress-strain response of these materials becomes critical for the success of these applications. Such evaluation is required to establish reliable constitutive relationship to model the complex thermomechanical behaviour of SMAs. This paper is intended to present a non-exhaustive overview on studies and results dealing with experimental characterisation and modelling of the effects of stress state on mechanical behaviour of shape memory alloys. In that respect, our presentation is mainly focused on one hand on experimental results on superelastic and ferroelastic deformation of polycrystalline alloys and on the other hand on the modelling at the macroscopic level, yielding critical reorientation or transformation constitutive equations. INTRODUCTIONShape memory alloys (SMAs) are known to exhibit a range of novel thermomechanical properties due to thermoelastic martensitic transformations. The superelasticity is a quasi-elastic deformation far beyond the conventional elastic limit of the material when deformed at certain temperature above A p the finishing temperature of the reverse martensite-to-austenite transformation. This phenomenon is associated with stress-induced martensitic (SIM) transformation. If the temperature is lowered to below M p the finishing temperature of the forward austenite-to-martensite transformation, the deformation proceeds by martensite reorientation. Martensite may deformed by reorientation forth and back with alternating stresses in opposite directions. This deformation mode is known as the ferroelasticity, in recognition of its phenomenological similarity to ferromagnetism. The one-way shape memory effect is observed when a specimen deformed by martensite reorientation reverts to its original shape upon heating to above A f Numerous experimental works have been performed in the past three decades aiming at characterising the thermo-mechanical behaviour in order to provide experimental evidences for the establishment of constitutive models. These experimental studies have been devoted to both single-crystal and polycrystal specimens, mainly using Cu-based and NiTi SMAs. Most mechanical testing has been carried out in tension using wire specimens. Less work has been done to characterise properties under other stress states. As engineering components become geometrically complex and as applications involve combinations of loading states, it becomes important to characterise material properties in different stress states. This will allow the establishment of reliable constitutive equations to model the complex thermomechanical behaviour of SMAs.The present paper is intended to give a non-exhaustive overview on the studies and results dealing with experimental characterisation and modelling of the influence of stress state on mechanical behaviour of...

show abstract

Experimental study on the thermoelastic martensitic transformation in shape memory alloy polycrystal induced by combined external forces

Cited by 127 publications

References 6 publications

The influence of texture on the shape-memory effect in polycrystals

The influence of texture on the shape-memory effect in polycrystals

Implicit Integration Method of Shape Memory Alloys Constitutive Model

Stress state effect on mechanical behaviour of shape memory alloys : Experimental characterisation and modelling

Contact Info

Product

Resources

About