A New Constitutive Model of Superelastic SMA

2012 ◽  
Vol 204-208 ◽  
pp. 3978-3981
Author(s):  
Wen Jie Ren ◽  
Jun Sen Jia ◽  
Xiang Shang Chen
Keyword(s):  
Cyclic Loading ◽  
Constitutive Model ◽  
Shape Memory ◽  
Mechanical Parameters ◽  
Superelastic Effect ◽  
Loading Tests ◽  
Hysteretic Characteristics ◽  
Set Up ◽  
Experimental Values ◽  
Cyclic Loading Tests

The shape memory alloys (SMAs) have received increasing interest attributed to their unique superelastic effect and the shape memory effect. The existing models of superelastic SMAs are generally complex for practical use. In this paper, cyclic loading tests of superelastic SMA wires are first performed. Based on the experiments, a simple constitutive model is set up. Simulations testify that the model can approximately describe the hysteretic characteristics of the superelastic SMA and the simulated mechanical parameters agree well with the experimental values.

scholarly journals Experimental Analyses of Mechanical Performance of CFST Column to Assembled Steel H-Beam Connections

2014 ◽  
Vol 8 (1) ◽  
pp. 270-278 ◽  
Author(s):  
Cui Chunyi ◽  
Zhao Jinfeng ◽  
Zhang Yannian ◽  
Zuo Wenxin
Keyword(s):  
Energy Dissipation ◽  
Cyclic Loading ◽  
Compression Ratio ◽  
Mechanical Performance ◽  
Axial Compression Ratio ◽  
Ring Plate ◽  
Loading Tests ◽  
Hysteretic Characteristics ◽  
H Beam ◽  
Cyclic Loading Tests

The mechanical performance of a new proposed type of cross-shaped connection with concrete-filled steel tubular (CFST) column and assembled steel H-beam was investigated. Cyclic loading tests on the cross-shaped connections are carried out by using MTS servo loading system. Comparative analyses are conducted based on the experimental results including hysteretic curves, skeleton curves and stiffness degradation curves as well as ductility coefficients of cyclic loading tests. Furthermore, effects of geometric parameters of ring-stiffened plate, axial compression ratio and backing plate on the deformation performance of cross-shaped connections are analyzed. The results show that the increase of width of ring plate and the shape change of ring plate from square to circle can both significantly improve the ductility and the hysteretic characteristics of connection. It is emphasized that the specimen with square ring plates is of better deformation performance but lower bearing capacity than the ones with circular ring plates. Besides, the backing plates always have positive effects on the hysteretic characteristics, ductility and energy dissipation of the CFST column connections. Conversely, the increase of axial compression ratio contributes negatively to both the bearing capacity and deformation performance of the connection specimens. It can be concluded that the presented cross-shaped connection is of good deformation performance relating to hysteretic characteristics, energy dissipation and ductility, which can provide reference towards engineering practice with potential perspective application.

An Experimental Study of Base Isolation Devices Using Shape Memory Alloy Wires

2004 ◽  
Author(s):  
Yoshitaka Yamashita ◽  
Arata Masuda ◽  
Akira Sone
Keyword(s):  
Experimental Study ◽  
Cyclic Loading ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Seismic Isolation ◽  
Base Isolation ◽  
Restoring Forces ◽  
Loading Tests ◽  
Isolation Device ◽  
Cyclic Loading Tests

In this study, we develop a base isolation device using SMA wires. Two types of SMA springs are used as softening springs, i.e. ring-type-spring (RTS) and buckling-type-spring (BTS). BTSs’ restoring forces have significant softening characteristics, which suppresses the acceleration transmissibility. Cyclic loading tests are conducted to investigate the durability of the SMA springs. The results show that they have the enough durability for seismic isolation.

Systems Actuated by Shape Memory Alloys: Identification and Modeling

2021 ◽  
Vol 1 (2) ◽  
pp. 12-20
Author(s):  
Najmeh Keshtkar ◽  
Johannes Mersch ◽  
Konrad Katzer ◽  
Felix Lohse ◽  
Lars Natkowski ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Mathematical Model ◽  
Constitutive Model ◽  
Shape Memory Alloys ◽  
Numerical Simulations ◽  
Shape Memory ◽  
Transfer Equation ◽  
Mechanical Parameters ◽  
Heat Transfer Equation ◽  
The Mathematical Model

This paper presents the identification of thermal and mechanical parameters of shape memory alloys by using the heat transfer equation and a constitutive model. The identified parameters are then used to describe the mathematical model of a fiber-elastomer composite embedded with shape memory alloys. To verify the validity of the obtained equations, numerical simulations of the SMA temperature and composite bending are carried out and compared with the experimental results.

scholarly journals TENSILE AND CYCLIC LOADING TESTS OF HORIZONTAL BRACE USING GLUED LAMINATED TIMBER WITH STEEL INSERTED PLATE

2019 ◽  
Vol 25 (60) ◽  
pp. 655-659
Author(s):  
Shuzo HIROISHI ◽  
Akira OKADA ◽  
Naoya MIYASATO ◽  
Noburu NAKAMURA ◽  
Kenichi MAMURO ◽  
...  
Keyword(s):  
Cyclic Loading ◽  
Glued Laminated Timber ◽  
Loading Tests ◽  
Cyclic Loading Tests
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