A piezoelectrically generated bistable laminate for morphing

Lee, Andrew J.; Moosavian, Amin; Inman, Daniel J.

doi:10.1016/j.matlet.2017.01.005

Cited by 48 publications

(13 citation statements)

References 12 publications

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“…This also provides the most margin for bifurcation from one to two stable states to occur post cure when the voltage is released. According to Lee et al (2017a), the critical side length for generating bistability is 85 mm when the aspect ratio of the laminate is 1 and the actuation voltage during bonding is 1500 V. However, at this length, the bifurcation voltage is 0 V and this leaves no margin for manufacturing imperfections while completely limiting the deformation differences between the two resulting configurations. With MFC manufacturing limitations considered, the side length of 200 mm is chosen to ensure sufficiently large displacements and adequate margin for producing bistability.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…As for the energy harvesting method, piezoelectric materials are attached to bistable structures to convert vibrationinduced strains to electrical energy due to their large power densities, ease of fabrication, and application over other methods such as electrostatic, electromagnetic, and magnetostrictive transduction. Recently, a novel means of generating bistability with piezoelectric actuation was investigated by Lee et al (2017aLee et al ( , 2017b. By bonding two actuated macro fiber composites (MFCs) in a cross-ply layup and shutting off the power post cure, two stable states are generated through the production of in-plane residual stresses, as shown in Figure 1.…”

Section: Introductionmentioning

confidence: 99%

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A multifunctional bistable laminate: Snap-through morphing enabled by broadband energy harvesting

Lee

Inman

2018

Journal of Intelligent Material Systems and Structures

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The elastic instabilities associated with buckling in bistable structures have been harnessed toward energy-based and motion-based applications, with significant research toward energy harvesting and morphing. Often combined with smart materials, structural prototypes are designed with a single application in mind. Recently, a novel method of inducing bistability was proposed by bonding two piezoelectrically actuated macro fiber composites in a ½0 MFC =90 MFC T layup and releasing the voltage post cure to yield two cylindrically stable configurations. Since the macro fiber composites are simultaneously the actuator and host structure, the resulting efficiencies enable this bistable laminate to be multifunctional, with both broadband energy harvesting and snap-through morphing capabilities. This article experimentally characterizes the vibration-based energy harvesting performance of the laminate to enable morphing. Through frequency sweeps across the first two modes of both states, the laminate exhibits broadband cross-well dynamics that are exploited for improved power generation over linear resonant harvesters. Besides single-well oscillations, snap-throughs are observed in intermittencies and subharmonic, chaotic, and limit cycle oscillations. The maximum power output of each regime and their charge durations of an energy harvesting module are assessed. The laminate's capabilities are then bridged by utilizing harvested energy in the charged module to initiate snap-through actuation.

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Section: Experimental Methodologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

A multifunctional bistable laminate: Snap-through morphing enabled by broadband energy harvesting

Lee

Inman

2018

Journal of Intelligent Material Systems and Structures

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“…Lee et al built such a laminate consisting of only two piezoelectric MFCs that functions as both the actuator and the primary structure. [38][39][40] They bonded two MFCs orthogonally in their actuated states and released the voltage post cure to create in-plane residual stresses. Recall that introducing proper prestress or residual stress is one of the key techniques to impart bistability to laminates.…”

Section: Actuators Based On Electrically Driven Bistable Structuresmentioning

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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“…In fact, multistable structures have already been investigated for morphing applications. Piezo-or SMA-actuated bistable laminated composites have been typically considered [19][20][21][22]. In these cases, multistability arises due to unsymmetric layup patterns, or from residual stresses introduced during the manufacturing process [23][24][25].…”

Section: Introductionmentioning

confidence: 99%

A morphing metastructure concept combining shape memory alloy wires and permanent magnets for multistable behavior

Sales

Rade

Inman

2020

J Braz. Soc. Mech. Sci. Eng.

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This article presents a novel morphing unit cell concept which relies on the combination of shape memory alloy wires for actuation and permanent magnets to enable multistability. Two distinct applications are investigated experimentally, consisting in a morphing beam metastructure made with three unit cells and a variable camber airfoil metastructure having six unit cells in the chord-wise direction. Tests are performed to assess the influence of the permanent magnets on the morphing behavior of the two referred metastructures. It is verified that the permanent magnets are able to provide new stable equilibrium configurations to the metastructure and to reduce the time necessary for morphing. Another interesting feature, which enables the reduction in energy consumption, is that, due to the magnetic interactions, the thermal activation of the SMA wires can be ceased once an equilibrium configuration is achieved. The paper describes the design premises, evaluates its limitations and devises future improvements.

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A piezoelectrically generated bistable laminate for morphing

Cited by 48 publications

References 12 publications

A multifunctional bistable laminate: Snap-through morphing enabled by broadband energy harvesting

A multifunctional bistable laminate: Snap-through morphing enabled by broadband energy harvesting

Bistable Structures for Advanced Functional Systems

A morphing metastructure concept combining shape memory alloy wires and permanent magnets for multistable behavior

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