scholarly journals HYSTERETIC BEHAVIOR IN AN Fe-BASED SHAPE MEMORY ALLOY UNDER TENSILE/COMPRESSIVE CYCLIC THERMOMECHANICAL LOADING

1997 ◽  
Vol 46 (3Appendix) ◽  
pp. 23-30 ◽  
Author(s):  
Fumihito NISHIMURA ◽  
Noriko WATANABE ◽  
Kikuaki TANAKA
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Hysteretic Behavior ◽  
Thermomechanical Loading ◽  
Cyclic Thermomechanical Loading

A constitutive model for Fe-based shape memory alloy considering martensitic transformation and plastic sliding coupling: Application to a finite element structural analysis

2012 ◽  
Vol 23 (10) ◽  
pp. 1143-1160 ◽  
Author(s):  
Walid Khalil ◽  
Alain Mikolajczak ◽  
Céline Bouby ◽  
Tarak Ben Zineb
Keyword(s):  
Finite Element ◽  
Phase Transformation ◽  
Structural Analysis ◽  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory ◽  
Internal Variables ◽  
Thermomechanical Loading ◽  
Proposed Model ◽  
Numerical Tool

In this article, we propose a finite element numerical tool adapted to a Fe-based shape memory alloy structural analysis, based on a developed constitutive model that describes the effect of phase transformation, plastic sliding, and their interactions on the thermomechanical behavior. This model was derived from an assumed expression of the Gibbs free energy taking into account nonlinear interaction quantities related to inter- and intragranular incompatibilities as well as mechanical and chemical quantities. Two scalar internal variables were considered to describe the phase transformation and plastic sliding effects. The hysteretic and specific behavior patterns of Fe-based shape memory alloy during reverse transformation were studied by assuming a dissipation expression. The proposed model effectively describes the complex thermomechanical loading paths. The numerical tool derived from the implicit resolution of the nonlinear partial derivative constitutive equations was implemented into the Abaqus® finite element code via the User MATerial (UMAT) subroutine. After tests to verify the model for homogeneous and heterogeneous thermomechanical loadings, an example of Fe-based shape memory alloy application was studied, which corresponds to a tightening system made up of fishplates for crane rails. The results we obtained were compared to experimental ones.

Cyclic deformation properties of TiNi shape memory alloy under thermomechanical loading

1996 ◽  
Author(s):  
Hisaaki Tobushi ◽  
Shinya Yamada ◽  
Takashi Hachisuka ◽  
Kikuaki Tanaka
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Cyclic Deformation ◽  
Thermomechanical Loading ◽  
Deformation Properties

Experimental characterization and control of a magnetic shape memory alloy actuator using the modified generalized rate-dependent Prandtl–Ishlinskii hysteresis model

2018 ◽  
Vol 232 (5) ◽  
pp. 506-518 ◽  
Author(s):  
Saeid Shakiba ◽  
Mohammad Reza Zakerzadeh ◽  
Moosa Ayati
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Excitation Frequency ◽  
Hysteresis Loops ◽  
Experimental Results ◽  
Hysteretic Behavior ◽  
Magnetic Shape Memory ◽  
Shape Memory Alloy Actuator ◽  
Rate Dependent ◽  
Magnetic Shape Memory Alloy

In this article, two models are used, namely rate-independent and rate-dependent generalized Prandtl–Ishlinskii, to characterize a magnetic shape memory alloy actuator. The results show that the rate-independent model cannot consider the effect of input excitation frequency, while the rate-dependent model omits this drawback by defining a time-dependent operator. For the first time, the effects of excitation frequency on the hysteretic behavior of magnetic shape memory alloy actuator are investigated. In this study, five excitation voltages with different frequencies in the range of 0.05–0.4 Hz are utilized as inputs to the magnetic shape memory alloy actuator and the displacement outputs are measured. Experimental results indicate that, with increasing the excitation frequency, the size of the hysteresis loops changes. Since the generalized rate-dependent Prandtl–Ishlinskii model cannot consider the asymmetric hysteresis loops, in the developed model, a tangent hyperbolic function is applied as an envelope function in order to improve the capability of the model in characterizing the asymmetric behavior of magnetic shape memory alloy actuator. The parameters of both rate-dependent and rate-independent models are identified by genetic algorithm optimization. The results reveal that the rate-independent form is not capable of accurately describing the hysteretic behavior of magnetic shape memory alloy actuator for different input frequencies. Simulation and experimental results also demonstrate the proficiency of the developed model for precise characterization of the saturated rate-dependent hysteresis loops of magnetic shape memory alloy actuator. In addition, the proposed model is utilized for determining a proper range for controller coefficients during controller design.

A uniaxial constitutive model for NiTi shape memory alloy bars considering the effect of residual strain

2019 ◽  
Vol 30 (8) ◽  
pp. 1163-1177
Author(s):  
Canjun Li ◽  
Zhen Zhou ◽  
Yazhi Zhu
Keyword(s):  
Shape Memory Alloy ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Residual Strain ◽  
Hysteretic Behavior ◽  
Niti Shape Memory Alloy ◽  
Strain Effect ◽  
Proposed Model ◽  
Residual Strains

Super-elastic shape memory alloys are widely used in structural engineering fields due to their encouraging super-elasticity and energy dissipation capability. Large-size shape memory alloy bars often present significant residual strains after unloading, which emphasizes the necessity of developing a residual strain effect–coupled constitutive model to predict well the performance of shape memory alloy–based structures. First, this article experimentally studies the hysteretic behavior of NiTi shape memory alloy bars under quasi-static loading conditions and investigates the effects of cyclic numbers and strain amplitudes on residual strain. Second, a concept of cumulative transformation strain is preliminarily introduced into a phenomenological Lagoudas model. A uniaxial constitutive model for shape memory alloy bars including the residual strain is proposed. By using OpenSees platform, numerical simulations of shape memory alloy bars are conducted—the results of which indicate that the proposed model can accurately capture the hysteretic behavior of shape memory alloys. The predicted residual strains show a good agreement to experimental results, which demonstrates the desirable efficiency of the proposed model.

Design of Shape Memory Alloy Damper for Base Isolated Structure

1997 ◽  
Author(s):  
Krzysztof Wilde ◽  
Paolo Gardoni ◽  
Yozo Fujino ◽  
Stefano Besseghini
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Base Isolation ◽  
Hysteretic Behavior ◽  
Isolation System ◽  
Rubber Bearing ◽  
Laminated Rubber Bearing ◽  
Base Isolation System ◽  
Rubber Bearings ◽  
Smart Base Isolation

Abstract Base isolation provides a very effective passive method of protecting the structure from the hazards of earthquakes. The proposed isolation system combines the laminated rubber bearing with the device made of shape memory alloy (SMA). The smart base isolation uses hysteretic behavior of SMA to increase the structural damping of the structure and utilizes the different responses of the SMA at different levels of strain to control the displacements of the base isolation system at various excitation levels. The performance of the smart base isolation is compared with the performance of isolation by laminated rubber bearings to assess the benefits of additional SMA damper for isolation of three story building.

Hysteretic behavior in an Fe-Cr-Ni-Mn-Si polycrystalline shape memory alloy during thermomechanical cyclic loading

1994 ◽  
Vol 3 (1) ◽  
pp. 135-143 ◽  
Author(s):  
K. Tanaka ◽  
T. Hayashi ◽  
F. Nishimura ◽  
H. Tobushi
Keyword(s):  
Cyclic Loading ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Hysteretic Behavior

A Multi-Channel Power Controller for Actuation and Control of Multiple SMA Actuators

2009 ◽  
Author(s):  
Rohan Hangekar ◽  
Stefan Seelecke
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Electric Power ◽  
Position Control ◽  
Electronic Device ◽  
Hysteretic Behavior ◽  
Graphic User Interface ◽  
Channel Power ◽  
Power Controller ◽  
Sma Actuators

This paper presents a multi-channel electronic power controller device for Shape Memory Alloy (SMA) actuators. The use of shape memory alloy wires as actuators has been proposed in numerous novel applications such as Smart Inhaler System [1], BAT Micro Air Vehicle [2], etc. These systems have multiple SMA wires for actuation of their mechanisms. The SMA wires can be actuated by controlling the joule heating or the electric power in that wire. This paper describes the development of a multi-channel power device that can control multiple SMA actuators simultaneously. The device presented herewith utilizes a Field Programmable Gate Array (FPGA) board and a custom built electronic device to independently and simultaneously control electric power in three different SMA actuators. The controller adapts to the non linear and hysteretic behavior of the resistance of the SMA actuators and adjusts the pulse width modulated voltage across them to maintain the desired value of power. The controller uses the resistance measurement of the SMA actuators as feedback. With the help of modeling efforts to relate resistance to strain, it is envisioned that feedback position control of these actuators can be implemented without the necessity of a sensor. The device is tested with graphic user interface which enables a user to control various parameters during operation of this device and to monitor the results. The design and implementation of this device is detailed in this paper along with its performance charts. The results relate the input power, observed actuation strokes and measured resistances in the SMA actuators under various conditions. A relevant discussion on implementing position control in Smart Inhaler System using this device is also presented.

Analysis of uniaxial stress-strain-temperature hysteresis in an Fe-based shape memory alloy under thermomechanical loading

1997 ◽  
Vol 8 (4) ◽  
pp. 349-362 ◽  
Author(s):  
Fumihito Nishimura ◽  
Noriko Watanabe ◽  
Kikuaki Tanaka
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Uniaxial Stress ◽  
Temperature Hysteresis ◽  
Thermomechanical Loading ◽  
Stress Strain

scholarly journals Transformation Conditions and Subloops In an Fe-Based Shape Memory Alloy Under Thermomechanical Loading

1995 ◽  
Vol 05 (C2) ◽  
pp. C2-477-C2-482 ◽  
Author(s):  
K. Tanaka ◽  
F. Nishimura ◽  
H. Tobushi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Thermomechanical Loading
Sign in / Sign up

Export Citation Format

Share Document