Design optimization of segment-reinforced bistable mechanisms exhibiting adjustable snapping behavior

Huang, Yu; Zhao, Jian; Liu, Shutian

doi:10.1016/j.sna.2016.10.014

Cited by 21 publications

(5 citation statements)

References 30 publications

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“…However, the hinged beam has a variable cross-section along the beam length. The hinged shape is usually designed to promote some snapthrough properties, such as symmetric bistability [50][51][52][53] or energy dissipation [54]. Uniform cross-section beams allow a more distributed compliance along their length.…”

Section: Introductionmentioning

confidence: 99%

Analytical Study of the Snap-Through and Bistability of Beams With Arbitrarily Initial Shape

Hussein

Younis

2020

Journal of Mechanisms and Robotics

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We derive the snap-through solution and the governing snapping force equations for an arbitrarily pre-shaped beam deflected under a mid-length lateral point force. The exact solution is obtained based on the classical theory of elastic beams as a superposition of the initial shape and the modes of buckling. Two kinds of solution are identified depending on the axial force level. The two solutions, bifurcation conditions, bistability conditions, and the snapping force equations are derived and discussed. The snap-through and snapping force solutions are then calculated for two common beam initial shapes, the curved (first buckling shape) and the inclined one (V-shape). In both cases, explicit expressions are obtained describing the snap-through behavior. The analytical modeling results show excellent agreement with the finite element simulations. The comparison between the two cases shows a similar snap-through behavior qualitatively, while several differences and similarities are noticed quantitatively.

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Section: Introductionmentioning

confidence: 99%

Analytical Study of the Snap-Through and Bistability of Beams With Arbitrarily Initial Shape

Hussein

Younis

2020

Journal of Mechanisms and Robotics

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“…To achieve a constant torque this mechanism uses the fact that bistable beams can have both positive-or negativestiffness behaviour in their post-buckling region [52][53][54]. Usually a bistable beam has a negative stiffness in the postbuckled state, but by manipulating correctly the beam parameters (width, thickness, length and inclination angle) using a finite element software, a region of zero stiffness and hence constant torque can be created.…”

Section: Bistable Beam Mechanismsmentioning

confidence: 99%

Constant Torque Mechanisms: A Survey

Saerens

Furnémont

Legrand

et al. 2022

Applied Mechanics Reviews

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In this paper an overview is given of all types of constant torque mechanisms (CTMs) based on both function and structure. Based on their architecture they can be divided into five distinct categories which all have their specific behaviour. It is also shown that these CTMs can be divided into two application types, namely power assistance or torque stabilization. Due to the fact that in research mainly constant force mechanisms (CFMs) have been tackled, also some explanation is given on how CFMs can be transformed into CTMs. It is also shown that some of these CTMs have a very high specific energy which can make that they have potential application as energy storage/power provider in novel fields like robotics where they have almost not been used yet.

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“…A symmetrical snap-through behavior results in a non-conditional bistability and similar margin of stability between the two sides of buckling. Pre-shaped beams with variable cross-section were designed to enhance the symmetry in the snap-through behavior [21][22][23][24]. The symmetry indicates that the switching force is similar in the forward and backward directions.…”

Section: Snap-through Of Pre-shaped Beamsmentioning

confidence: 99%

A monolithic tunable symmetric bistable mechanism

Hussein

Khan

Younis

2020

Smart Mater. Struct.

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A tunable symmetric bistable micro-machined mechanism with monolithic structure is presented. The mechanism consists of two sets of pre-shaped beams of similar properties and dimensions; however with one set is curved opposite to the other. The bistability is induced by creating a negative stiffness behavior at the initial position of the moving part to break its stability. This is possible at a certain electrothermal axial loading of both beam sets. The active bistability is symmetric with respect to the initial position. The distance between stable positions is tunable with the applied electrothermal voltages. The mechanism can be used as a tunable bi-directional actuator with different applied voltages. The design and concept are demonstrated based on finite-element simulations and experimental measurements.

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Design optimization of segment-reinforced bistable mechanisms exhibiting adjustable snapping behavior

Cited by 21 publications

References 30 publications

Analytical Study of the Snap-Through and Bistability of Beams With Arbitrarily Initial Shape

Analytical Study of the Snap-Through and Bistability of Beams With Arbitrarily Initial Shape

Constant Torque Mechanisms: A Survey

A monolithic tunable symmetric bistable mechanism

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