Design and development of electro mechanical bistable functions using shape memory alloy

Vetriselvi, V.; Geetha, M.; Dhanalakshmi, K.

doi:10.1109/iicpe.2018.8709540

Cited by 3 publications

(2 citation statements)

References 3 publications

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“…The accurate control of materials properties, orientation, location in the fabrication process of novel structures will enable the control of bistable threshold as necessary. Another attractive point is assigning innovative functions to bistable structures, e.g., programmable materials, metamaterials, sensing/memory devices [ 45 ] and logic controller [ 163 ] as George Whitesides and his coworkers did where they rendered a bistable actuator function as an autonomous controller for soft robots.…”

Section: Discussionmentioning

confidence: 99%

Bistable Structures for Advanced Functional Systems

Cao

Derakhshani

Fang

et al. 2021

Adv Funct Materials

140

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Bistable mechanical systems having two local minima of potential energy can rest in either of the two stable equilibrium states in the absence of external loadings. A snap-through action may occur under suitable stimuli and/or loading, during which such systems exhibit distinct properties from linear structures. Such kinds of structures have been widely exploited for designing advanced functional systems for a variety of applications. Here, the advances of bistable structures are summarized for novel advanced functional systems, including actuators, energy harvesters, microelectromechanical systems (MEMS), robotics, energy absorbers, and programmable devices as well as metamaterials. The controllable snap-through motions are highlighted in the nonlinear structures of bistability/multistability. Finally, the major principles, structures, pros and cons, and the future research directions along with its challenges are discussed.

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Section: Discussionmentioning

confidence: 99%

Bistable Structures for Advanced Functional Systems

Cao

Derakhshani

Fang

et al. 2021

Adv Funct Materials

140

View full text Add to dashboard Cite

show abstract

“…The simplest configuration would be an SMA wire connected with a normal spring. Such configuration has been largely explored in various applications such as to actuate a single degree of freedom robotic arm [33], to make a digital to analog converter [34], three degrees of freedom parallel robot [35], etc. Thus, in the present study, a commonly used actuator configuration: SMA wire and steel bias spring, is considered for implementing the presented numerical methods.…”

Section: Mathematical Model Of Sma Wire-steel Bias Spring Configurationmentioning

confidence: 99%

Comparative analysis of numerical methods for constitutive modeling of shape memory alloys

Bhatt¹,

Soni²,

Singla³

2021

Modelling Simul. Mater. Sci. Eng.

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This article presents a comparative analysis of four numerical approaches—Newton Raphson method, trust region dogleg method, implicit solver (IS) based method considering a proposed simplified differential phase kinetics as well as an existing arbitrary loading based phase kinetics to solve the constitutive equation of shape memory alloy (SMA). These numerical methods can be applied to model any SMA-based actuator under thermo-mechanical loading. To demonstrate these methods, a configuration of SMA wire with a normal bias spring is considered as a case study, and its mathematical model is solved with the above-mentioned numerical approaches. Further, a comparative study is carried out that compares the solutions obtained via these methods and with the published literature. It highlights the numerical stability, computational time, and the level of complexity for the implementation of the numerical methods. The study details out both the merits and demerits of the presented numerical methods and the computational algorithms to implement these methods. Among the discussed methods, it is concluded that the IS-based numerical method with the proposed differential form of Chung’s phase kinetics model seems better for implementing the constitutive modeling for the selected case study.

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A Study of a Bistable Reciprocating Piston Pump Driven by Shape Memory Alloys and Recuperative Springs

et al. 2023

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This paper presents and examines a new design concept for a bistable reciprocating piston pump. The bistable pump mechanism belongs to the bistable mechanisms, which have two stable positions at the end of the suction and discharge strokes. The transition between the stable positions is achieved by using triggering force at each beginning of suction and discharge and subsequent movement using a recuperative spring. In this mechanism, the triggering forces are created by two Shape Memory Alloy (SMA) wires. Geometric and force expressions for the pump suction and discharge strokes are derived. Additional equations are obtained for the balance of moments for the two stable equilibrium positions and the unstable position in the middle of the stroke. Numerical studies have been conducted for the suction and discharge strokes, considering the force exerted by the gas on the piston, which is modelled by an indicator diagram assuming a polytropic process. It was found that the load on the mechanism has significant non-uniformity. The diagrams illustrating the distribution of total moments showed that the cold SMA wire shifted the point of instability. The numerical example shows how to choose the right spring stiffness to obtain energy recovery. In this way, the triggering SMA forces act only at the beginning of the two strokes and, after that, the recuperative forces substitute the action of the SMA forces. The theoretical relationships and methods presented here are suitable for synthesizing new pumps or analyzing similar mechanisms.

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Design and development of electro mechanical bistable functions using shape memory alloy

Cited by 3 publications

References 3 publications

Bistable Structures for Advanced Functional Systems

Bistable Structures for Advanced Functional Systems

Comparative analysis of numerical methods for constitutive modeling of shape memory alloys

A Study of a Bistable Reciprocating Piston Pump Driven by Shape Memory Alloys and Recuperative Springs

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