High-speed spinning disks on flexible threads

Zhao, Zi-Long; Zhou, Shiwei; Xu, Shanqing; Feng, Xi‐Qiao; Xie, Yi Min

doi:10.1038/s41598-017-13137-1

Cited by 10 publications

(4 citation statements)

References 31 publications

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“…[16] and [17] and the many references cited therein). Recent contributions to the literature on the mechanics of helical rods include [18][19][20][21][22]. With respect to this recent literature, the main differences of our research consist in the type of structure analyzed, and in the generality of the allowed deformations, i.e., rods are not assumed to remain circular helices a priori and can deform into helical shapes with nonconstant curvature and torsion.…”

Section: Introductionmentioning

confidence: 99%

Mechanics of tubular helical assemblies: ensemble response to axial compression and extension

2021

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Nature and technology often adopt structures that can be described as tubular helical assemblies. However, the role and mechanisms of these structures remain elusive. In this paper, we study the mechanical response under compression and extension of a tubular assembly composed of 8 helical Kirchhoff rods, arranged in pairs with opposite chirality and connected by pin joints, both analytically and numerically. We first focus on compression and find that, whereas a single helical rod would buckle, the rods of the assembly deform coherently as stable helical shapes wound around a common axis. Moreover, we investigate the response of the assembly under different boundary conditions, highlighting the emergence of a central region where rods remain circular helices. Secondly, we study the effects of different hypotheses on the elastic properties of rods, i.e., stress-free rods when straight versus when circular helices, Kirchhoff’s rod model versus Sadowsky’s ribbon model. Summing up, our findings highlight the key role of mutual interactions in generating a stable ensemble response that preserves the helical shape of the individual rods, as well as some interesting features, and they shed some light on the reasons why helical shapes in tubular assemblies are so common and persistent in nature and technology. Graphic Abstract We study the mechanical response under compression/extension of an assembly composed of 8 helical rods, pin-jointed and arranged in pairs with opposite chirality. In compression we find that, whereas a single rod buckles (a), the rods of the assembly deform as stable helical shapes (b). We investigate the effect of different boundary conditions and elastic properties on the mechanical response, and find that the deformed geometries exhibit a common central region where rods remain circular helices. Our findings highlight the key role of mutual interactions in the ensemble response and shed some light on the reasons why tubular helical assemblies are so common and persistent.

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Section: Introductionmentioning

confidence: 99%

Mechanics of tubular helical assemblies: ensemble response to axial compression and extension

2021

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“…It is shown that the chirality, initial helix angles of the plies and fibers, and the fiber migration pattern can be used to control the mechanical response of a yarn with fiber migration. The theoretical model presented in this work can help design and optimize a general class of helical structures, which has a promise in analyzing and predicting the unique mechanical behavior of high-performance thread materials and devices, for example, the artificial muscles and actuators, 2,41 the buzzer prototype, 42 and the pump drill. 43 Finally, it is noteworthy that the deformation of real hierarchical helical structures is usually complicated, and there are many factors that may influence their mechanical responses.…”

Section: Resultsmentioning

confidence: 99%

The influence of fiber migration on the mechanical properties of yarns with hierarchical helical structures

Zheng

Liu

2018

The Journal of Strain Analysis for Engineering Design

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An analytical method is presented for studying the influence of fiber migration on the mechanical properties of a yarn with two-level helical structures. The theory of ideal migration is applied to the seven-ply yarn, which results in the exchange of the interior structure of the yarn. A bottom-up method for analyzing the internal forces and stresses of the yarn under axial tension and torsion is developed. The influence of fiber migration is demonstrated by making contrast between the mechanical responses of carbon nanotube yarns with and without fiber migration. The numerical results show that there is a periodical non-monotonic variation in both the internal forces and the stresses with the length of yarn. A stress concentration is revealed around the half-cycle migration point and the one-cycle migration point. It is shown that the chirality, initial helix angle, and the fiber migration pattern can be used to control the mechanical performance of yarns.

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“…For example, some research groups adopted the kitchen utensils (e.g., egg beater and salad spinner) as low-cost centrifuges for isolating the plasma from whole blood. Recently, the playful whirligig was also used as the ultralow-cost, lightweight, and human-powered centrifuge, which could achieve a strong centrifugal force of 30 000 g . , Although the ideas are very fantastic and interesting, it is difficult to promote the use of these do-it-yourself (DIY) centrifuges for researchers from different disciplines.…”

Section: Conceptual Designmentioning

confidence: 99%

“…Recently, the playful whirligig was also used as the ultralow-cost, lightweight, and human-powered centri-fuge, which could achieve a strong centrifugal force of 30 000g. 11,12 Although the ideas are very fantastic and interesting, it is difficult to promote the use of these do-ityourself (DIY) centrifuges for researchers from different disciplines.…”

mentioning

confidence: 99%

Inertial Microfluidic Syringe Cell Concentrator

et al. 2018

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Low-cost, easy-to-use cell concentration tools are in urgent demand for biomedical diagnosis in resource-poor settings. Herein, we propose a novel inertial microfluidic syringe cell (IMSC) concentrator that employs inertial focusing to increase cell concentration through ordering the cell and removing the cell-free fluid. A three-part structure, consisting of a cap-shaped upper housing, a circular gasket, and a lower housing with a spiral channel, is adopted for simple fabricating and assembling, which enables the seamless translation of our IMSC concentrator into commercial outcomes without additional redesigning. The performance characterization indicates that our IMSC concentrator is capable of processing samples with different initial concentrations over a broad flow rate range. The satisfactory concentration performances over a broad driving flow rate range make it possible for our IMSC concentrator to be driven by pushing the syringe with single hand. Finally, pollen particles and MCF-7 cells are successfully concentrated at a high throughput of 3.0 mL/min (up to 4.2 × 10 counts/mL) under the hand-powered drive. We envision wide applications of our IMSC concentrator as "centrifugation on a syringe tip" to various cell concentration pretreatments in resource-poor settings.

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High-speed spinning disks on flexible threads

Cited by 10 publications

References 31 publications

Mechanics of tubular helical assemblies: ensemble response to axial compression and extension

Mechanics of tubular helical assemblies: ensemble response to axial compression and extension

The influence of fiber migration on the mechanical properties of yarns with hierarchical helical structures

Inertial Microfluidic Syringe Cell Concentrator

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