Thermomechanical performance analysis and experiment of electrothermal shape memory alloy helical spring actuator

2021 ◽  
Vol 13 (10) ◽  
pp. 168781402110446
Author(s):  
Yang Xiong ◽  
Jin Huang ◽  
Ruizhi Shu
Keyword(s):  
Theoretical Model ◽  
Shape Memory Alloy ◽  
Response Time ◽  
Shape Memory ◽  
Thermomechanical Properties ◽  
Maximum Output ◽  
Helical Spring ◽  
Strong Nonlinearity ◽  
Restoring Force ◽  
Displacement Response

In this paper, an electrothermal shape memory alloy helical spring actuator constructed from shape memory alloy with copper-cored enameled wire is presented and fabricated. Based on the shear constitutive model of a shape memory alloy, the Thermo equilibrium equation and the geometrical equation of helical spring establish the thermomechanical theoretical model of helical spring actuator with electrothermal shape memory alloys under different scenarios. The thermomechanical behaviors of the actuator were verified by numerical simulation with experimental tests, and the actuator thermomechanical properties were derived from the analysis with current, temperature, response time, restoring force, and axial displacement as parameters. The experimental results show that the actuator produces a maximum recovery force of 70.2 N and a maximum output displacement of 7.7 mm at 100°C. The actuator response time is 26 s at a current of 3A. It is also demonstrated that the theoretical model can effectively characterize the complex thermo-mechanical properties of the actuator due to the strong nonlinearity of the shape memory alloy. The experimental temperature-force response and temperature-displacement response, as well as the force-displacement response at different temperatures, provide references for the design and fabrication of electrothermal shape-memory alloy coil spring actuators.

Development of a Novel Micro-Actuator Driven by Shape Memory Alloy

2010 ◽  
Vol 164 ◽  
pp. 9-14 ◽  
Author(s):  
Chi Hsiang Pan ◽  
Ying Bin Wang
Keyword(s):  
Shape Memory Alloy ◽  
Response Time ◽  
Shape Memory ◽  
Pulse Width Modulation ◽  
Helical Spring ◽  
Micro Actuator ◽  
Finite Element Software ◽  
Tube Type ◽  
Sma Actuator ◽  
Driving Circuit

This paper presents a novel microactuator driven by shape memory alloy (SMA). First, the helical spring-shaped SMA is fabricated from SMA wire (Ti50%-Ni45%-Cu5%) with one way shape memory effect and 0.6 mm in diameter. Subsequently, a compliant tube-type microactuator driven by helical spring-shaped SMA is developed. The performances of the helical spring-shaped SMA and the compliant tube-type microactuator, such as the response time, the recovery force and the surface temperature in terms of the driving currents, are investigated. The driving circuit system comprising a pulse width modulation (PWM) control circuit is used to drive the actuator. Experiments demonstrate that control of the SMA actuator using PWM effectively reduces the energy consumption and ensures a short cooling time to guarantee a high response time in actuating cycles. Finite element software (COSMOSWorks) is applied for the analysis of the compliant tube-type actuator, which aim is to demonstrate the agreement between the theoretical analysis and experiment as well as to improve the performance of the actuators.

Effects of size and geometry on the thermomechanical properties of additively manufactured NiTi shape memory alloy

2020 ◽  
Vol 107 (7-8) ◽  
pp. 3145-3154 ◽  
Author(s):  
Nazanin Farjam ◽  
Mohammadreza Nematollahi ◽  
Mohsen Taheri Andani ◽  
Mohammad J. Mahtabi ◽  
Mohammad Elahinia
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Thermomechanical Properties ◽  
Niti Shape Memory Alloy

Electronic Instrumentation for Shape Memory Alloy Actuators

2020 ◽  
Author(s):  
Luzia Marcela Magalhães Lopes ◽  
Maxsuel Ferreira Cunha ◽  
José Marques Basílio Sobrinho ◽  
Cícero Da Rocha Souto ◽  
Andreas Ries ◽  
...  
Keyword(s):  
Phase Transformation ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Helical Spring ◽  
Voltage Measurement ◽  
Power Capacity ◽  
Type Alloy ◽  
Low Weight ◽  
Spring Type ◽  
Electronic Instrumentation

Shape memory alloy (SMA) actuators have been increasingly found applications due to their low weight and high power capacity. Additionally they are able to function as a sensor. Upon phase transformation, the material changes its electrical resistance. Phase transformation in SMAs occurs either by loading or heating the material. Since SMAs materials are usually metals, heat can be produced by passing an electric current through the alloy. This idea in mind, the present work reports the development of electronic circuits for power supply, current measurement and voltage measurement for shape memory alloy actuators. For validation of the operation of the designed circuits, a NiTi helical spring type alloy actuator was tested. The actuator was mounted on a mechanical platform; it was possible to determine its thermal behavior and force generation. Characteristic operation curves of the helical spring type actuator are presented.

Thermomechanical Properties of Shape-Memory Alloy and Polymer and Their Composites

2009 ◽  
Vol 16 (3) ◽  
pp. 236-247 ◽  
Author(s):  
Hisaaki Tobushi ◽  
Elzbieta Pieczyska ◽  
Yoshihiro Ejiri ◽  
Toshimi Sakuragi
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Thermomechanical Properties

NiTi Shape Memory Alloy Wire’s Constitutive Describe at Different Temperatures

2017 ◽  
Vol 729 ◽  
pp. 13-17
Author(s):  
Guang Yong Yang ◽  
Yang Zhong ◽  
Zhi Fei Qiu ◽  
Jun Wang ◽  
Wei Na Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Shape Memory Alloy ◽  
Shape Memory ◽  
Niti Shape Memory Alloy ◽  
Thermal And Mechanical Properties ◽  
Restoring Force ◽  
Intelligent Material ◽  
Different Temperatures ◽  
Relationship Of ◽  
The Relationship

NiTi shape memory alloy is an intelligent drive and awareness materials which develop very rapidly and is used in many fields in recent years, whose mechanical properties are not only related to chemical composition, but also closely related to the temperature. This article aims to study the NiTi shape memory alloy wire’s constitutive behavior coupled thermal and mechanical properties at different temperatures. By analyzing the results, the relationship of NiTi shape memory alloy between deformation and the restoring force at elevated temperature is obtained, thus providing a basis for the engineering design and simulation process of NiTi intelligent material.

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