Gotowe bibliografie tematyczne / Elastic ribbons

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Gotowa bibliografia na temat „Elastic ribbons”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "Elastic ribbons"

Zhao, Y. H., i G. J. Weng. "Effective Elastic Moduli of Ribbon-Reinforced Composites". Journal of Applied Mechanics 57, nr 1 (1.03.1990): 158–67. http://dx.doi.org/10.1115/1.2888297.

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Based on the Eshelby-Mori-Tanaka theory the nine effective elastic constants of an orthotropic composite reinforced with monotonically aligned elliptic cylinders, and the five elastic moduli of a transversely isotropic composite reinforced with two-dimensional randomly-oriented elliptic cylinders, are derived. These moduli are given in terms of the cross-sectional aspect ratio and the volume fraction of the elliptic cylinders. When the aspect ratio approaches zero, the elliptic cylinders exist as thin ribbons, and these moduli are given in very simple, explicit forms as a function of volume fraction. It turns out that, in the transversely isotropic case, the effective elastic moduli of the composite coincide with Hill’s and Hashin’s upper bounds if ribbons are harder than the matrix, and coincide with their lower bounds if ribbons are softer. These results are in direct contrast to those of circular fibers. Since the width of the Hill-Hashin bounds can be very wide when the constituents have high modular ratios, this analysis suggests that the ribbon reinforcement is far more effective than the traditional fiber reinforcement.

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Knight, D. P., i F. Vollrath. "Spinning an elastic ribbon of spider silk". Philosophical Transactions of the Royal Society of London. Series B: Biological Sciences 357, nr 1418 (28.02.2002): 219–27. http://dx.doi.org/10.1098/rstb.2001.1026.

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The Sicarid spider Loxosceles laeta spins broad but very thin ribbons of elastic silk that it uses to form a retreat and to capture prey. A structural investigation into this spider's silk and spinning apparatus shows that these ribbons are spun from a gland homologous to the major ampullate gland of orb web spiders. The Loxosceles gland is constructed from the same basic parts (separate transverse zones in the gland, a duct and spigot) as other spider silk glands but construction details are highly specialized. These differences are thought to relate to different ways of spinning silk in the two groups of spiders. Loxosceles uses conventional die extrusion, feeding a liquid dope (spinning solution) to the slit–like die to form a flat ribbon, while orb web spiders use an extrusion process in which the silk dope is processed in an elongated duct to produce a cylindrical thread. This is achieved by the combination of an initial internal draw down, well inside the duct, and a final draw down, after the silk has left the spigot. The spinning mechanism in Loxosceles may be more ancestral.

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Aoki, Michio, i Jia-Yang Juang. "Forming three-dimensional closed shapes from two-dimensional soft ribbons by controlled buckling". Royal Society Open Science 5, nr 2 (luty 2018): 171962. http://dx.doi.org/10.1098/rsos.171962.

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Conventional manufacturing techniques—moulding, machining and casting—exist to produce three-dimensional (3D) shapes. However, these industrial processes are typically geared for mass production and are not directly applicable to residential settings, where inexpensive and versatile tools are desirable. Moreover, those techniques are, in general, not adequate to process soft elastic materials. Here, we introduce a new concept of forming 3D closed hollow shapes from two-dimensional (2D) elastic ribbons by controlled buckling. We numerically and experimentally characterize how the profile and thickness of the ribbon determine its buckled shape. We find a 2D master profile with which various elliptical 3D shapes can be formed. More complex natural and artificial hollow shapes, such as strawberry, hourglass and wheel, can also be achieved via strategic design and pattern engraving on the ribbons. The nonlinear response of the post-buckling regime is rationalized through finite-element analysis, which shows good quantitative agreement with experiments. This robust fabrication should complement conventional techniques and provide a rich arena for future studies on the mechanics and new applications of elastic hollow structures.

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Bartels, Sören. "Numerical Simulation of Inextensible Elastic Ribbons". SIAM Journal on Numerical Analysis 58, nr 6 (styczeń 2020): 3332–54. http://dx.doi.org/10.1137/20m1357494.

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Du, Zhi Wei, Z. M. Sun, B. L. Shao i A. S. Liu. "Study on the Microstructure and Deformation Behavior of Ultrafine-Crystalline Cu-Y Ribbons". Materials Science Forum 610-613 (styczeń 2009): 591–97. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.591.

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Cu99.8Y0.2, Cu99.2Y0.8 and Cu98Y2 alloy ribbons were prepared by single roller melt spinning. The microstructure was studied by X-ray diffraction (XRD), transmission electron microscopy (TEM), high voltage electron microscope (HVEM) and high resolution electron microscopy (HREM). The results showed that α-Cu was the dominative phase in the rapid solidification ribbons of three alloys. A secondary phase Cu4Y was detected in the Cu98Y2 ribbon by XRD. The grain size was in a range of 50-200 nm in the Cu99.2Y0.8 and Cu98Y2 ribbons. Many nano-scale twins and some dislocations existed inside the larger grains. However, the grains in Cu99.8Y0.2 ribbon were in the size of microns and the sub-grains with small misorentations were in 100-200 nm. To understand the deformation mechanism, in situ tensile test were carried out at a High Voltage Electron Microscope (HVEM). The results showed that the deformation is predominated by the dislocation slip in larger grains. To accommodate the deformation, elastic deformation occured in the small grains in the initial stage of the deformation. Meanwhile, some small grains maybe deform by grain rotations. With strain increasing, some fractures generated and propagated along the grain boundaries or across the grains.

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Hou, Junli, Zhong Yang, Hongbo Duan, Yiyi Feng, Yongchun Guo i Jianping Li. "Microstructure and Nanoindentation Behavior of Ti40Zr40Ni20 Quasicrystal Alloy by Casting and Rapid Solidification". Metals 11, nr 10 (30.09.2021): 1563. http://dx.doi.org/10.3390/met11101563.

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A Ti40Zr40Ni20 quasicrystal (QCs) rod and ribbons were prepared by conventional casting and rapid solidification. The X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and differential scanning calorimeter (DSC) techniques were used to investigate the microtissue, phase composition, and solidification features of the samples; the nano-indentation test was carried out at room temperature. The results show that a mixture of the α-Ti(Zr) phase and the icosahedral quasicrystal (I-phase) was formed in the Ti40Zr40Ni20 rod; the microstructure of Ti40Zr40Ni20 ribbons mainly consisted of the I-phase. The solidification mechanism of the I-phase was different in the two alloys. The I-phase in the quasicrystalline rod was formed by packet reaction while in the ribbons it was generated directly from the liquid. At room temperature, both samples had relatively high hardness and elastic modulus; the elastic modulus of the ribbons is 76 GPa, higher than the 45 GPa of the rod. The hardness of the ribbons was more than twice that of the rod.

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Semirov, Alexander V., Michael S. Derevyanko, Dmitriy A. Bukreev, Alexey A. Moiseev i Galina V. Kurlyandskaya. "Magnetoimpedance of Amorphous Ferromagnetic CoFeSiB Ribbons in the Wide Temperature Range". Solid State Phenomena 215 (kwiecień 2014): 337–41. http://dx.doi.org/10.4028/www.scientific.net/ssp.215.337.

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The influence of the temperature, elastic tensile stresses and external magnetic field on the impedance of amorphous Co75Fe5Si4B16 ribbons was studied. It was observed that the character of the elastic tensile stresses influences the impedance and its changes in the external magnetic field are determined by a temperature of the ribbons. It was shown that changes of the stressimpedance character and magnetoimpedance temperature dependences were caused by a change in the sign of a magnetostriction constant with the temperature.

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Freddi, Lorenzo, Peter Hornung, Maria Giovanna Mora i Roberto Paroni. "One-dimensional von Kármán models for elastic ribbons". Meccanica 53, nr 3 (3.04.2017): 659–70. http://dx.doi.org/10.1007/s11012-017-0666-5.

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Freddi, Lorenzo, Peter Hornung, Maria Giovanna Mora i Roberto Paroni. "A Corrected Sadowsky Functional for Inextensible Elastic Ribbons". Journal of Elasticity 123, nr 2 (13.10.2015): 125–36. http://dx.doi.org/10.1007/s10659-015-9551-4.

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Paroni, Roberto, i Giuseppe Tomassetti. "Macroscopic and Microscopic Behavior of Narrow Elastic Ribbons". Journal of Elasticity 135, nr 1-2 (12.12.2018): 409–33. http://dx.doi.org/10.1007/s10659-018-09712-w.

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Rozprawy doktorskie na temat "Elastic ribbons"

Albarrán, Arriagada Octavio Eduardo, i Arriagada Octavio Eduardo Albarrán. "Curling dynamics of naturally curved surfaces : axisymmetric bio-membranes and elastic ribbons". Phd thesis, Université Montpellier II - Sciences et Techniques du Languedoc, 2013. http://tel.archives-ouvertes.fr/tel-00997537.

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Curling deformation of thin elastic surfaces appears in numerous natural and man-made structures where a spontaneous curvature is present. In this thesis, we couple theoretical approaches and macroscopic experiments on elastic ribbons to understand the dynamics of curling of opened bio-membranes, motivated by the need to better understand recent microscopic observations during egress of Malaria infected red blood cells (MIRBC) and bursting of artificial polymersomes.In a first part, we study theoretically pore stability and curling propagation of an initially opened spherical bio-membrane. We model geometrically curling deformation as the revolution of a decentered Archimedean spiral, leading to a prescribed toroidal wrapping of the membrane. In this configuration, we show how the stability of a pore to curling depends strongly on both line-tension and shear elasticity and we discuss these results in relation to the curling of MIRBCs membranes. Moreover, taking into account viscous dissipations, the consequent dynamics we calculate agrees quantitatively well with experimental data obtained during opening of MIRBCs. Our approach shows in particular how the membrane dissipation resulting from the surface redistribution dominates curling dynamics over outer viscous dissipation.However, the complexity of the spherical geometry and the lack of detailed images in microscopic observations hamper the development of more accurate models where the coupling between flow and deformation is fully understood. Subsequently, we study in a second part the curling deformation of macroscopic naturally curved elastic ribbons in different viscous media and elastic conditions. At high Reynolds numbers, due to the tendency of ribbons to localize bending deformations when a curling front travels down the material, we show that curling reaches rapidly a constant propagating velocity. In this regime, the ribbon wraps itself into a compact roll whose size is predicted through the solitary wave solution of the associated Elastica. At low Reynolds numbers, however, closer to the hydrodynamic conditions of curling in microscopic membranes, we show that the strong lubrication forces induce a non-compact curling. The overall size of the spiraling ribbon increases in time leading to a temporal decrease of the released elastic power and therefore a consequent decrease in velocity. We discuss how such discovery sheds a new light on the modeling of curling in MIRBCs and polymersomes.

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Albarrán, Arriagada Octavio Eduardo. "Curling dynamics of naturally curved surfaces : axisymmetric bio-membranes and elastic ribbons". Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20055/document.

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La déformation de matériaux élastique dont l'une au moins des dimensions est petite apparaît dans un grand nombre de structures naturelles ou artificielles pour lesquelles une courbure spontanée est présente. Dans ces travaux de thèse, nous couplons plusieurs approches théoriques à des expériences macroscopiques sur des rubans élastiques afin de comprendre la dynamique d'enroulement de biomembranes ouvertes d'un trou. La motivation est issue d'observations récentes d'enroulements obtenues au cours de la sortie de parasites de la Malaria de globules rouges infectés, et de l'explosion de vésicules polymère. Dans une première partie, nous étudions théoriquement la stabilité d'un pore et la propagation de l'enroulement sur une biomembrane sphérique ouverte. Nous modélisons de façon géométrique l'enroulement toroïdal de la membrane par une spirale d'Archimède de révolution et décentrée. Avec cette hypothèse, nous montrons que la stabilité du pore vis-à-vis de l'enroulement dépend fortement de la tension de ligne et du cisaillement et nous discutons ces résultats dans le cadre de l'enroulement de membranes MIRBCs. De plus, en prenant en compte les différentes sources de dissipation, nous obtenons un très bon accord entre les données expérimentales obtenues pour les MIRBCs et la dynamique d'enroulement obtenue par le calcul. Notre approche montre en particulier que la dissipation dans la membrane due à la redistribution de la matière durant l'enroulement domine sur la dissipation visqueuse dans le milieu.Cependant, la complexité de la géométrie sphérique, ainsi que le nombre limité d'observations microscopiques à l'échelle de la membrane sont une entrave au développement de modèles plus détaillés qui permettraient de décrire complètement le couplage entre écoulement et déformation. Nous avons donc étudié dans une seconde partie la déformation d'enroulement dans le cas de rubans élastiques ayant une courbure spontanée dans différents milieux visqueux et pour différentes conditions élastiques. A grands nombres de Reynolds, en raison de la localisation de la courbure pour les rubans au cours de la propagation du front d'enroulement le long du matériau, nous montrons que l'enroulement atteint rapidement une vitesse de propagation constante. Dans ce régime, le ruban s'enroule sur lui-même de façon compacte, sur un cylindre dont la taille est prévue à partir de la solution de l'onde stationnaire pour l'Elastica. A faible nombre de Reynolds, cependant, se rapprochant des conditions d'enroulement d'une membrane microscopique, nous mettons en évidence l'influence des forces de lubrification sur la nature non-compacte de l'enroulement. La taille globale de la spirale de ruban augmente dans le temps conduisant à une diminution de la puissance élastique libérée et donc à une diminution de la vitesse. Nous discutons dans quelle mesure ces résultats peuvent faire avancer la modélisation de l'enroulement dans les MIRBCs et les vésicules polymère
Curling deformation of thin elastic surfaces appears in numerous natural and man-made structures where a spontaneous curvature is present. In this thesis, we couple theoretical approaches and macroscopic experiments on elastic ribbons to understand the dynamics of curling of opened bio-membranes, motivated by the need to better understand recent microscopic observations during egress of Malaria infected red blood cells (MIRBC) and bursting of artificial polymersomes.In a first part, we study theoretically pore stability and curling propagation of an initially opened spherical bio-membrane. We model geometrically curling deformation as the revolution of a decentered Archimedean spiral, leading to a prescribed toroidal wrapping of the membrane. In this configuration, we show how the stability of a pore to curling depends strongly on both line-tension and shear elasticity and we discuss these results in relation to the curling of MIRBCs membranes. Moreover, taking into account viscous dissipations, the consequent dynamics we calculate agrees quantitatively well with experimental data obtained during opening of MIRBCs. Our approach shows in particular how the membrane dissipation resulting from the surface redistribution dominates curling dynamics over outer viscous dissipation.However, the complexity of the spherical geometry and the lack of detailed images in microscopic observations hamper the development of more accurate models where the coupling between flow and deformation is fully understood. Subsequently, we study in a second part the curling deformation of macroscopic naturally curved elastic ribbons in different viscous media and elastic conditions. At high Reynolds numbers, due to the tendency of ribbons to localize bending deformations when a curling front travels down the material, we show that curling reaches rapidly a constant propagating velocity. In this regime, the ribbon wraps itself into a compact roll whose size is predicted through the solitary wave solution of the associated Elastica. At low Reynolds numbers, however, closer to the hydrodynamic conditions of curling in microscopic membranes, we show that the strong lubrication forces induce a non-compact curling. The overall size of the spiraling ribbon increases in time leading to a temporal decrease of the released elastic power and therefore a consequent decrease in velocity. We discuss how such discovery sheds a new light on the modeling of curling in MIRBCs and polymersomes

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Wang, Shang-Pin, i 王上賓. "Magneto-elastic properties of some ferromagnetic ribbons". Thesis, 2012. http://ndltd.ncl.edu.tw/handle/47167674419975844135.

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碩士
國立臺灣海洋大學
光電科學研究所
100
The magnetostrictive materials are potential for MEMS and device application, because of their capability to convert magnetic energy to mechanical energy. This thesis focuses on (Fe81-XCoXGa19)B20(X =0、7、11、19、23) arc discharge into ingots, spray into a thin strip of magnetostrictive, to X-ray diffraction (XRD) and vibration sample magnetometer (VSM), observed magnetic properties. VAC-6030 thin with heat treatment, to observe the magnetostrictive characteristics of vibrating sample magnetometer (VSM), the nature of the observed magnetic. Measured the magnetic part, (Fe81-XCoXGa19)B20(X =0、7、11、19、23) ribbons through the VSM measurement results, we found that with the increase in X-content, along with the coercive force (Hc)rising on behalf of the magnetic dipole with the increase of cobalt, the magnetic dipole are more difficult to flip, and saturation magnetization decrease with increasing X, indicating that the magnetic properties fall. Of magnetostriction part of strain gage to measure the saturation magnetostriction, Co 23% magnetostrictive Co 0% good, and when the turn angle is high, the value of the magnetostriction rise phenomenon. VAC6030 on the as-cast, 200,250,300,340 degrees do VSM, found that heat treatment, the impact will be negligible magnetostriction at high angle stretching larger, while the heat treatment temperature is high, stretching the value of feeling but smaller.

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Oratis, Alexandros Thomas. "Shooting rubber bands: dynamic buckling in unconstrained elastic ribbons". Thesis, 2016. https://hdl.handle.net/2144/17073.

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Most of us are familiar with stretching and shooting rubber bands. However, it is not immediately obvious to state which side of the rubber band will hit a predetermined target first. When a rubber band is stretched and suddenly released an axial stress wave propagates towards the end it is divides the rubber band into a stretched and relaxed area. As the wave reaches the end it reflects and causes a compression wave that propagates backwards causing dynamic buckling if the length of the compressed area is larger than the Euler critical length. If the elastic became unconstrained in a similar manner to shooting rubber bands, it is unknown whether buckling would occur and how it would affect the trajectory of the elastic. Using high speed photography we find dynamic buckling occurs when shooting rubber bands. Using a Neo-Hookean model for the rubber band we find that the wavelength is proportional to the thickness and the square root of the inverse stretch ratio. Moreover, we analyze the trajectory of the rubber band when shot by developing a model of the front and back speeds using the propagation of stress waves in rubber. We conclude that the both front and back speeds are proportional to a fraction of the speed of sound in the material based on the amount of stretching. Using the front and back speed scaling we show that our analysis is valid only for short time scales since at larger time scales the effects of the rubber band curvature and the rotation applied when launched tend to dominate.
2016-12-21T00:00:00Z

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Książki na temat "Elastic ribbons"

Parker, Philip M. The 2007-2012 World Outlook for Non-Elastic Woven-Edge Ribbons. ICON Group International, Inc., 2006.

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You Can Do It!...Ribbons and Braids/Book & Barrettes/Ribbons/Beads/Elastic Bands (You Can Do It Series). Summit Publishing Group, 1994.

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Parker, Philip M. The 2007-2012 Outlook for Non-Elastic Woven-Edge Ribbons in Japan. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Woven Non-Elastic Ribbons, Woven Edge. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 Outlook for Non-Elastic Woven-Edge Ribbons in India. ICON Group International, Inc., 2006.

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Parker, Philip M. The 2007-2012 Outlook for Non-Elastic Woven-Edge Ribbons in Greater China. ICON Group International, Inc., 2006.

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The 2006-2011 World Outlook for Woven Non-Elastic Labels, Ribbons, and Tape. Icon Group International, Inc., 2005.

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Parker, Philip M. The 2007-2012 World Outlook for Woven Non-Elastic Labels, Ribbons, and Tape. ICON Group International, Inc., 2006.

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chibane, el mahdi, i chibane. 2022 Planner/Pocket Calendar, Standard Daily: Calendars, Leather Material, Elastic Closure, Decorative Stitching, Page Finder Ribbons and Notes Pages. Independently Published, 2021.

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Parker, Philip M. The 2007-2012 World Outlook for Woven Non-Elastic Narrow Fabrics and Webbing Excluding Labels, Woven Edge Ribbons, and Tape. ICON Group International, Inc., 2006.

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Części książek na temat "Elastic ribbons"

Barsotti, Riccardo, Roberto Paroni i Giuseppe Tomassetti. "On the Straight-Helicoid to Spiral-Ribbon Transition in Thin Elastic Ribbons". W Lecture Notes in Mechanical Engineering, 967–76. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-41057-5_79.

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Audoly, Basile, i Keith A. Seffen. "Buckling of Naturally Curved Elastic Strips: The Ribbon Model Makes a Difference". W The Mechanics of Ribbons and Möbius Bands, 293–320. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7300-3_15.

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Starostin, E. L., i G. H. M. van der Heijden. "Equilibrium Shapes with Stress Localisation for Inextensible Elastic Möbius and Other Strips". W The Mechanics of Ribbons and Möbius Bands, 67–112. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7300-3_8.

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Rimrott, F. P. J., i G. Fritzsche. "Large Twisting and Kinking of Thin-Walled Elastic Ribbons". W Trends in Structural Mechanics, 143–52. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5476-5_15.

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Kirby, Nicholas O., i Eliot Fried. "Gamma-Limit of a Model for the Elastic Energy of an Inextensible Ribbon". W The Mechanics of Ribbons and Möbius Bands, 35–47. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7300-3_6.

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Dias, Marcelo A., i Basile Audoly. "“Wunderlich, Meet Kirchhoff”: A General and Unified Description of Elastic Ribbons and Thin Rods". W The Mechanics of Ribbons and Möbius Bands, 49–66. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7300-3_7.

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Lin, Chun-Chi, Yang-Kai Lue i Hartmut R. Schwetlick. "The Second-Order L 2 $L^{2}$ -Flow of Inextensible Elastic Curves with Hinged Ends in the Plane". W The Mechanics of Ribbons and Möbius Bands, 263–91. Dordrecht: Springer Netherlands, 2016. http://dx.doi.org/10.1007/978-94-017-7300-3_14.

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Yousfi, M. A., C. Ammari, K. Hajlaoui i Z. Tourki. "Numerical Modelling of Undulatory Elastic Behavior of Metallic Glasses Ribbon". W Lecture Notes in Mechanical Engineering, 320–26. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-52071-7_44.

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Dickson, J. I., S. Turenne, J. P. Baïlon i J. B. Vogt. "The Formation of Ribbon-Like Extrusions and Intrusions During the Cyclic Deformation of Copper". W Low Cycle Fatigue and Elasto-Plastic Behaviour of Materials, 43–48. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3459-7_6.

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Knight, David P., i Fritz Vollrath. "Spinning an Elastic Ribbon of Spider Silk". W Elastomeric Proteins, 115–35. Cambridge University Press, 2003. http://dx.doi.org/10.1017/cbo9780511546327.008.

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Streszczenia konferencji na temat "Elastic ribbons"

Evans, Phillip, Marcelo Dapino, Ryan Hahnlen i Joshua Pritchard. "Dimensionally Stable Optical Metering Structures With NiTi Composites Fabricated Through Ultrasonic Additive Manufacturing". W ASME 2013 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/smasis2013-3204.

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High performance optical metering structures in airborne and space applications need to exhibit dimensional stability in demanding thermal and mechanical environments. Materials for this application should have a low coefficient of thermal expansion, high thermal diffusivity, high specific stiffness and exhibit good ductility. Current materials are limited in one or more of these properties. Common choices are invar, carbonfiber composite, and silicon-carbide. The former has low specific stiffness and thermal diffusivity and the latter choices are brittle materials that require special care and have slow manufacturing processes. In this work, the development of a thermally invariant metal matrix composite will be described along with its incorporation into a high performance optical metering structure. The material is a composite of super-elastic NiTi ribbons and aluminum, where the ribbons are embedded using ultrasonic additive manufacturing. Measurements and modeling of the thermo-elastic response will be presented followed by the design and manufacture of a metering structure. The metering structure design eases integration with an optical bench and lens bezels while leveraging the advantageous properties of this new metal matrix composite.

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Merlo, Alberto M., Carloandrea Malvicino, Giorgio Carpegna, Walter Ferraris, Maria L. Parodi, Riccardo Seccardini, Helmut Pfu¨tzner i in. "Application of Magneto-Elastic Sensors to the Measurement of Fluid Flow Rates in the Automotive Domain". W ASME 8th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2006. http://dx.doi.org/10.1115/esda2006-95582.

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The monitoring of several vehicle and engine operation parameters has been a key factor for the successful introduction of electronic control of the most important car performances. Among the several measured quantities, the measurement of fluid mass flow still requires sophisticated and expensive transducers, no convenient and low cost technologies having been available so far. The recent invention of the concept of bi-layer ribbons, has allowed to adjust the sensitivity of magneto-elastic sensing elements to be employed in the construction of bending sensors, in order to match their metrological properties to the wanted application. Due to their low production cost, small size and good reliability, magneto-elastic bi-layer sensors proved to be a promising technology for the large scale production of fluid flowmeters, which can be used in the automotive industry and are operated in a very wide temperature range, with temperatures spanning from −25 to 115 °C. In the present research, two main application domains have been taken into consideration namely the flow metering of the air streaming into engine air intake manifolds and the measurement of the flow rates of refrigerant fluid in the cooling loop of car air conditioning systems (HVAC). The technical feasibility of agglutinated bi-layer flow sensors, has been investigated and evaluated, by means of experimental testing under real like operating conditions. The present paper briefly describes the manufacturing process and the experimental methodologies. Preliminary results are given and future developments are foreseen, while further research guidelines are established.

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Furst, Stephen J., Bryan Peele i Stefan Seelecke. "Design and Fabrication of an SMA Actuated Bat". W ASME 2012 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/smasis2012-8198.

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Shape memory alloy (SMA) actuator wires provide a natural analog for biological muscles. Additionally, SMA wires are lightweight and have an extremely high energy density, making them desirable for aerospace applications. Therefore, it is natural to consider implementing SMA actuator wires in a flapping flight platform based on the biology of an animal, such as a bat. This work focuses on the design and fabrication of a bat with SMA-actuated elbow and shoulder joints configured to mimic the flapping pattern of a bat. The joints themselves are made from super-elastic SMA ribbons that can bend through large angles and constrain the rotation of each joint to a single degree of freedom. The design process involves careful consideration of the SMA wire placement and joint geometry such that the desired joint rotation is induced without exposing either the super-elastic joint material or actuator wires to excessive stresses. A simplified bending and force model is used to estimate the bending and stresses, and an optimization algorithm is employed to maximize bending without exceeding stress limits. Fabrication involves carefully attaching the small, 75 μm diameter, actuator wires such that they can be guided through the natural curves of the bat’s body, and their pre-strain can be tuned after assembly. The heating power input waveforms are shaped by a custom-built power control devise for multi-functional SMA wires such that the flapping motion mimics that of the natural flyer. The prototype has been tested to 100,000 cycles and installed in an exhibit at the Raleigh Museum of Natural Science as an example of how technology often finds inspiration from nature.

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Mockensturm, Eric, i Arash Mahdavi. "Van Der Waal’s Elastica". W ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82991.

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Experimental investigations of carbon nanotubes have revealed that they can collapse into nanoribbons that have a dumb-bell shape cross-section. Due to the extreme exibility of single-atom thick graphene sheets, if the tube is large enough self-induced Van der Waals forces acting on the at surfaces of the ribbon will be large enough to hold the nanotube in the collapsed (ribbon) configuration. Energetically, the additional strain (bending) energy stored in the collapsed state is offset by the decrease in energy of the Van der Waals interactions. Because Van der Waals forces are short ranged, one nds that tubes of great enough diameter are bistable. Here we investigate the natural of this bistability by investigating how the energy stored in the tube changes as it is compressed by at rigid indenters of various widths. The nanotube is assumed to deform uniformly along its length and the cross-section is modeled using inextensible, non-linear beam theory (Euler’s Elastica). We nd that the in ated (tube) conguration is always stable but that the energy barrier against decreases with increasing tube radius. Additionally, the energy difference between the in ated and collapsed states decreases nearly linear with increasing radius and for tubes with radius greater than 26 A the collapsed state is energetically favored.

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Chen, Ping, i Shuilian Chen. "Stress Analysis on New Multilayer Cylinder With Use of Thin Inner Shell and Cross-Helical Wound Shaped-Steel Ribbon for Pressure Vessels". W ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97745.

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In this paper, a stress analysis on a new type of multilayer cylinder using thin shell and cross-helically interlocked shaped-steel ribbon wound layers is carried out under the action of internal pressure based on the elastic and elastic-plastic mechanics.

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Lionel, You Liang, Wong i Gary K. Fedder. "Elastic ribbon-like piezoelectric energy harvester for wearable devices with stretchable surfaces". W 2016 38th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2016. http://dx.doi.org/10.1109/embc.2016.7591805.

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Chang, J. Y. "Submicron-Scale Flexible Ribbon Cable Seek-Settling Induced Vibration Reduction in High Capacity Disk Drives". W ASME 2007 International Mechanical Engineering Congress and Exposition. ASMEDC, 2007. http://dx.doi.org/10.1115/imece2007-41640.

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This paper presents a modeling and design methodology to reduce and even to eliminate flexible ribbon cable seek-settling induced vibrations in modern high capacity computer disk drives. Optimization is first conducted in obtaining proper cable profiles when the rotary actuator swings across the disk using classical elastica theory with consideration of compliant boundary at its J-block conjunction point with rotary actuator and fixed boundary conditions at bracket. In addition to modal kinetic coupling factor, the cable’s vibration modes are projected onto actuator voice coil’s excitations to form as a weighted response factor to serve as the cost function in optimization process. It was found through the proposed process that the seek-settling flexible cable vibration can be minimized and even reduced to zero. Additional servo adaptive control format will be also discussed in this paper to totally eliminate the flexible ribbon vibrations in disk drive’s seek-settling operations.

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Skalitzky, Amanda, Austin Gurley, David Beale i Kyle Kubik. "Design and Analysis of SMA Woven Fabric". W ASME 2018 Conference on Smart Materials, Adaptive Structures and Intelligent Systems. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/smasis2018-8206.

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Shape Memory Alloys (SMAs) are often used for robotic, biomedical, and aerospace applications because of their unique ability to undergo large amounts of stress and strain during thermomechanical loading compared to traditional metals. While SMAs such as NiTi have been used in wire, plate, and tubular forms, NiTi as a woven dry fabric has yet to be analyzed for use as protective materials and actuators. Applications of SMA fabric as a “passive” material include shields, seatbelts, watchbands and window screens. Applications as an “active” material include robotic actuators, wearable medical and therapy devices, and self-healing shields and screens. This paper applies a macro-mechanical model from composites analysis to NiTi plain woven fabric to determine the effective elastic constants. The fabric model is based on actual weave geometry, including the presence of open gaps and wire cross-sectional area, and with the same diameter and alloy in the warp and weft. A woven NiTi ribbon has been manufactured (Figure 1) using a narrow weaving machine and has been tested in uniaxial tension. Planar fabric constants were measured at a range of temperatures. The analytically and experimentally derived constants for various weave patterns and cover factor combinations are presented and compared. It was determined that in uniaxial tension the fabric behaves like a collection of unidirectional wires, but has 78% of the rigidity, on average, across all test temperatures. This result is predicted by the fabric model with a 16% error, demonstrating that the proposed analytical model offers a useful tool for design and simulation of SMA fabrics.

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