Bistable Mechanisms for Space Applications

Zirbel, Shannon A.; Tolman, Kyler A.; Trease, Brian P.; Howell, Larry L.

doi:10.1371/journal.pone.0168218

Cited by 68 publications

(34 citation statements)

References 38 publications

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“…Membranes, films and coverslips can be embedded directly into 3D printed components 43 and 3D printed interfaces with analytical instruments 27 may enable easy integration of hybrid devices with existing experimental workflows. 3D printed mechanically-compliant mechanisms 44 , “4D” time-resolved printing 45 and the incorporation of structures that allow for the timed-release of reagents 46 may provide additional interactive and temporal functionality in the future.…”

Section: Resultsmentioning

confidence: 99%

Hybrid 3D printed-paper microfluidics

Zargaryan

Farhoudi

Haworth

et al. 2020

Sci Rep

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3D printed and paper-based microfluidics are promising formats for applications that require portable miniaturized fluid handling such as point-of-care testing. These two formats deployed in isolation, however, have inherent limitations that hamper their capabilities and versatility. Here, we present the convergence of 3D printed and paper formats into hybrid devices that overcome many of these limitations, while capitalizing on their respective strengths. Hybrid channels were fabricated with no specialized equipment except a commercial 3D printer. Finger-operated reservoirs and valves capable of fully-reversible dispensation and actuation were designed for intuitive operation without equipment or training. Components were then integrated into a versatile multicomponent device capable of dynamic fluid pathing. These results are an early demonstration of how 3D printed and paper microfluidics can be hybridized into versatile lab-on-chip devices.

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Section: Resultsmentioning

confidence: 99%

Hybrid 3D printed-paper microfluidics

Zargaryan

Farhoudi

Haworth

et al. 2020

Sci Rep

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“…Realizing comparable well-controlled instabilities in stiff structures (which would allow for stable wave propagation with low losses) is a challenge and has been limited to, primarily, impact mitigation. Stiff bistable structures have been made, e.g., out of bulk metallic glass [288]. Key is to design slender structures that accommodate large deformations with small strains.…”

Section: Discussionmentioning

confidence: 99%

Exploiting Microstructural Instabilities in Solids and Structures: From Metamaterials to Structural Transitions

Kochmann

Bertoldi

2017

Applied Mechanics Reviews

188

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Instabilities in solids and structures are ubiquitous across all length and time scales, and engineering design principles have commonly aimed at preventing instability. However, over the past two decades, engineering mechanics has undergone a paradigm shift, away from avoiding instability and toward taking advantage thereof. At the core of all instabilities-both at the microstructural scale in materials and at the macroscopic, structural level-lies a nonconvex potential energy landscape which is responsible, e.g., for phase transitions and domain switching, localization, pattern formation, or structural buckling and snapping. Deliberately driving a system close to, into, and beyond the unstable regime has been exploited to create new materials systems with superior, interesting, or extreme physical properties. Here, we review the state-of-the-art in utilizing mechanical instabilities in solids and structures at the microstructural level in order to control macroscopic (meta)material performance. After a brief theoretical review, we discuss examples of utilizing material instabilities (from phase transitions and ferroelectric switching to extreme composites) as well as examples of exploiting structural instabilities in acoustic and mechanical metamaterials.

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“…Bistable beams exhibit additional advantages, such as their simplicity, passive holding, low actuation energy, small footprint, large stroke with small restoring forces, and negative stiffness zone. These advantages make bistable beams suitable for an increasing number of applications at different scales, such as space applications [1], biomedical [2], energy harvesting [3,4], resonators [5], actuators [6] accelerometers [7], shock sensors [8], gas sensors [9], pressure sensors [10], flow sensors [11], grippers [12], mechanisms with large displacement and small actuation stroke [13], switches [14], relays [15], memory devices [16], logics [17], lamina emergent frustrum [18], statically-balanced mechanisms [19], soft robotics [20], constant force mechanisms [21,22], bistable positioning [23][24][25][26], and multistable devices [27][28][29][30][31][32].…”

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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Bistable Mechanisms for Space Applications

Cited by 68 publications

References 38 publications

Hybrid 3D printed-paper microfluidics

Hybrid 3D printed-paper microfluidics

Exploiting Microstructural Instabilities in Solids and Structures: From Metamaterials to Structural Transitions

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

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