Готові списки джерел за темами / Elastic layer

Добірка наукової літератури з теми "Elastic layer"

Автор: Grafiati
Опубліковано: 30 травня 2022
Оновлено: 29 січня 2023

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Статті в журналах з теми "Elastic layer"

1

Akiyama, Mari. "Elastic Fibers and F-Box and WD-40 Domain-Containing Protein 2 in Bovine Periosteum and Blood Vessels." Biomimetics 8, no. 1 (December 23, 2022): 7. http://dx.doi.org/10.3390/biomimetics8010007.

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Elastic fibers form vessel walls, and elastic fiber calcification causes serious vascular diseases. Elastin is a well-known elastic fiber component; however, the insoluble nature of elastic fibers renders elastic fiber component analysis difficult. A previous study investigated F-box and WD-40 domain-containing protein 2 (FBXW2) in the cambium layer of bovine periosteum and hypothesized that fiber structures of FBXW2 are coated with osteocalcin during explant culture. Here, FBXW2 was expressed around some endothelial cells but not in all microvessels of the bovine periosteum. The author hypothesized that FBXW2 is expressed only in blood vessels with elastic fibers. Immunostaining and Elastica van Gieson staining indicated that FBXW2 was expressed in the same regions as elastic fibers and elastin in the cambium layer of the periosteum. Alpha-smooth muscle actin (αSMA) was expressed in microvessels and periosteum-derived cells. Immunostaining and observation of microvessels with serial sections revealed that osteocalcin was not expressed around blood vessels at 6 and 7 weeks. However, blood vessels and periosteum connoted elastic fibers, FBXW2, and αSMA. These findings are expected to clarify the processes involved in the calcification of elastic fibers in blood vessels.
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2

Turuntaev, Sergey. "Peculiarities of Elastic Waves Generated by Fatigue Tensile Fractures." Advanced Materials Research 891-892 (March 2014): 1779–84. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.1779.

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In the case of fracturing of rocks in subcritical stress state, the stress release due to fracturing could be accompanied by stress increase near the fracture tips, so the rock deformation near the tips could also generate elastic waves (so called "stopping-phase"). Results of experimental modeling of elastic wave generations by fatigue tensile fractures are considered. The model sample consisted of elastic layer made of rubber and fragile layer made of paraffin, the layers were bounded. The elastic layer was stretched and fixed, so the fragile layer was under static tension and started fracturing by tensile fractures. First fractures appeared in visually intact material, later fractures were preceded by a cloud of small "micro" fractures. The fracturing generated elastic waves, which had two components: one corresponded to fracturing of the fragile layer and had characteristic frequency 5-10 kHz; another one had frequency 100-300 Hz, opposite onset and corresponded to tension of elastic layer. It was concluded that tensile fractures in stressed rocks could be considered as a kind of a double-source of elastic waves: one source is the fracture itself, another source is an area of deformations due to stress increase in the vicinity of the fracture tips.
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3

Belan, S., A. Chernykh, and V. Lebedev. "Boundary layer of elastic turbulence." Journal of Fluid Mechanics 855 (September 21, 2018): 910–21. http://dx.doi.org/10.1017/jfm.2018.662.

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We investigate theoretically the near-wall region in elastic turbulence of a dilute polymer solution in the limit of large Weissenberg number. As has been established experimentally, elastic turbulence possesses a boundary layer where the fluid velocity field can be approximated by a steady shear flow with relatively small fluctuations on the top of it. Assuming that at the bottom of the boundary layer the dissolved polymers can be considered as passive objects, we examine analytically and numerically the statistics of the polymer conformation, which is highly non-uniform in the wall-normal direction. Next, imposing the condition that the passive regime terminates at the border of the boundary layer, we obtain an estimate for the ratio of the mean flow to the magnitude of the flow fluctuations. This ratio is determined by the polymer concentration, the radius of gyration of polymers and their length in the fully extended state. The results of our asymptotic analysis reproduce the qualitative features of elastic turbulence at finite Weissenberg numbers.
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4

Hortwitz, J. A., M. S. Engelman, and S. Rosenblat. "The visco-elastic Ekman layer." Journal of Non-Newtonian Fluid Mechanics 18, no. 1 (January 1985): 87–100. http://dx.doi.org/10.1016/0377-0257(85)85014-x.

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5

Blinovskii, A. "Resultant wave in an elastic-layer/elastic-space system." Mechanics of Composite Materials 27, no. 2 (1991): 172–77. http://dx.doi.org/10.1007/bf00614734.

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6

Wilczyński, Arnold, and Marek Kociszewski. "Elastic properties of the layers of three-layer particleboards." European Journal of Wood and Wood Products 70, no. 1-3 (November 12, 2010): 357–59. http://dx.doi.org/10.1007/s00107-010-0497-8.

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7

Ting, T. C. T. "Mechanics of a thin anisotropic elastic layer and a layer that is bonded to an anisotropic elastic body or bodies." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 463, no. 2085 (July 3, 2007): 2223–39. http://dx.doi.org/10.1098/rspa.2007.1875.

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When a very thin elastic layer is bonded to an elastic body, it is desirable to have effective boundary conditions for the interface between the layer and the body that take into account the existence of the layer. In the literature, this has been done for special anisotropic elastic layers. We consider here the layer that is a general anisotropic elastic material. The mechanics of a thin layer is studied for elastostatics as well as steady state waves. It is shown that one-component surface waves cannot propagate in a semi-infinite thin layer. We then present Love waves in an anisotropic elastic half-space bonded to a thin anisotropic elastic layer. The dispersion equation so obtained is valid for long wavelength. Finally, effective boundary conditions are presented for two thin layers bonded to two surfaces of a plate and a thin layer bonded between two anisotropic elastic half-spaces.
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8

Matveev, Sergey A., and A. S. Belokopytov. "Distribution of Displacements in Elastic Layer." Applied Mechanics and Materials 835 (May 2016): 568–72. http://dx.doi.org/10.4028/www.scientific.net/amm.835.568.

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The displacements distribution on the depth of an elastic layer under normal loading is offered in this article. To approximate the displacements distribution the exponential dependence is used. The results of analytical approximation are compared to results of calculations by finiteelement method for various thickness of a layer.
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9

Choi, Ju Chan, Young Chan Choi, Dong Geon Jung, and Seong Ho Kong. "Elastic Buffer Layer Coupled Micro Probe." Journal of Sensor Science and Technology 22, no. 5 (September 30, 2013): 374–78. http://dx.doi.org/10.5369/jsst.2013.22.5.374.

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10

Abdelkader, M. Verid, and A. Ait Moussa. "Asymptotic study of thin elastic layer." Applied Mathematical Sciences 7 (2013): 5385–96. http://dx.doi.org/10.12988/ams.2013.36331.

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Дисертації з теми "Elastic layer"

1

Atay, Mehmet Tarik. "Fracture Of A Three Layer Elastic Panel." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606360/index.pdf.

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The panel is symmetrical about both x- and y- axes. The central strip (strip1) of width 2h1 contains a central transverse crack of width 2a on x-axis. The two strips (strip2) contain transverse cracks of width c-b also on x-axis. The panel is subjected to axial loads with uniform intensities p1 and p2 in strip1 and strip2 , respectively at . Materials of all strips are assumed to be linearly elastic and isotropic. Due to double symmetry, only one quarter of the problem and will be considered. The solutions are obtained by using Fourier transforms both in x and y-directions. Summing several solutions is due to the necessity for sufficient number of unknowns in general expressions in order to be able to satisfy all boundary conditions of the problem. The conditions at the edges of the strips and at the interfaces are satisfied and the general expressions for a three layer panel become expressions for the panel with free edges. Use of remaining boundary conditions leads the formulation to a system of two singular integral equations. These equations are converted to a system of linear algebraic equations which is solved numerically
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2

Kushnir, D. V. "Harmonic perturbation of elastic layer with cavity." Thesis, Вид-во СумДУ, 2005. http://essuir.sumdu.edu.ua/handle/123456789/19804.

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3

Sandin, Joakim. "Analysis Methods for Structures with Visco-Elastic Damping Treatment." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-13250.

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During aircraft development, the impact of vibrations is examined and how this affects the aircraft structure under different conditions. Those vibrations can damage electronic equipment that are installed within the fuselage and can even lead to material fatigue within the structure. To reduce vibrations there are two approaches that are preferred to use, installing vibration insulators attached between the structure and the electrical component or change the design of the structure to a stiffer one. Those methods are easiest to implement in an early stage of the development but in later stages, when vibration problems usually are detected, it is too difficult and expensive to do major changes of the structure and there is lack of space to implement vibration insulators. A third method is then to apply passive damping in form of damper mats to surfaces on structures where critical vibrations occurs.    The effects on the structural behavior when damper mats are applied to a certain structure are studied in this thesis work. The purpose is to get deeper knowledge about how damper mats can be used to reduce vibrations in aircraft structures. The type of damper mat that is studied is known as Constrained Layer Damping, CLD, which is a sandwich of a visco-elastic material layer and a stiffer constraining material layer. Modelling and simulation methods that are based on commercial FE-software have been developed. The analysis method is based on doing a modal analysis with structural damping taken into account. This makes it possible to predict the overall global damping at each structural mode. The models for damper mats have in this project been verified with experimental testing using typical damper mats. The methodology can be used to predict the behavior of damped structures in order to obtain an effective and lightweight passive damping solution.
Under utvecklingen av flygplan undersöks hur vibrationer påverkar flygplansstrukturen under olika förutsättningar. Dessa vibrationer kan skada elektronisk utrustning som är monterad i flygplanskroppen och kan även göra så att materialutmattning uppstår i flygplansstrukturen. För att motverka vibrationer finns det två metoder som är att föredra, antingen att montera vibrationsisolatorer mellan de elektroniska utrustningarna och strukturen eller att ändra designen på strukturer till en styvare. Dessa metoder är enkla att implementera i ett tidigt steg i utvecklingsprocessen men i senare steg, då vibrationsproblem ofta upptäcks, så är det för komplicerat och för dyrt att göra större ändringar på strukturen och så är det ont om plats för att kunna installera vibrations isolatorer. En tredje metod är istället att implementera passiv dämpning i form av dämpningsmattor på ytor av strukturen där kritiska vibrationer uppstår. Effekterna av det strukturella uppförandet när dämpningsmattor är applicerade på en viss struktur har studerats i det här examensarbetet. Syftet är att få en fördjupad kunskap om hur dämpningsmattor kan användas för att reducera vibrationer i flygplan strukturer. Den typ av dämpningsmatta som har studerats är känd som Constrained Layer Damping, CLD, vilken är en sandwich av ett visko-elastiskt lager samt ett styvare lager.  Modellerings och simuleringsmetoder som är baserade på kommersiella FE-mjukvaror har utvecklats. Analysmetoderna är baserade på att utföra modalanalys tillsammans med strukturell dämpning. Detta möjliggör att förutse den övergripande dämpningen vid varje strukturell mod. Modellerna för dämpningsmattorna har i det här projektet verifierats med experimental testning av typiska dämpningsmattor. Metodiken kan användas till att prediktera beteendet av dämpade strukturer för att uppnå en effektiv och lättviktig passiv dämpningslösning.
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4

Mert, Oya. "Frictionless Double Contact Problem For An Axisymmetric Elastic Layer Between An Elastic Stamp And A Flat Support With A Circular Hole." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613164/index.pdf.

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This study considers the elastostatic contact problem of a semi-infinite cylinder. The cylinder is compressed against a layer lying on a rigid foundation. There is a sharp-edged circular hole in the middle of the foundation. It is assumed that all the contacting surfaces are frictionless and only compressive normal tractions can be transmitted through the interfaces. The contact along interfaces of the elastic layer and the rigid foundation forms a circular area of which outer diameter is unknown. The problem is converted into the singular integral equations of the second kind by means of Hankel and Fourier integral transform techniques. The singular integral equations are then reduced to a system of linear algebraic equations by using Gauss-Lobatto and Gauss-Jacobi integration formulas. This system is then solved numerically. In this study, firstly, the extent of the contact area between the layer and foundation are evaluated. Secondly, contact pressure between the cylinder and layer and contact pressure between the layer and foundation are calculated for various material pairs. Finally, stress intensity factor on the edge of the cylinder and in the end of the sharp-edged hole are calculated.
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5

Zhao, Xujun. "Surface loading and rigid indentation of an elastic layer with surface energy effects." Thesis, University of British Columbia, 2009. http://hdl.handle.net/2429/12598.

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With the growing interest in nanotechnology, it is becoming important to understand the nanoscale mechanics to achieve successful design and fabrication of nanoscale devices. However, the classical continuum theory is not directly applicable to the analysis of nanoscale domains due to size-dependent behavior of nanostructures. Since the surface-to-volume ratio of a nanoscale domain is relatively high compared to that of a macro-scale domain, the energy associated with atoms at or near a free surface is different from that of atoms in the bulk. The effect of surface free energy therefore needs to be considered. Ultra-thin film/substrate systems, which are encountered in applications involving nanocoatings, nanotribology and material characterization based on nano-indentation, may be analyzed using modified continuum elasticity theory incorporating surface energy effects. This thesis presents a set of analytical solutions for elastic field of a layer of nanoscale thickness bonded to a rigid base under surface loading and indentation by a rigid body. Surface energy effects are accounted for by using Gurtin-Murdoch elasticity theory. Fourier and Hankel integral transforms are used to solve the two- and three- dimensional boundary-value problems involving non-classical boundary conditions associated with the generalized Young-Laplace equation. In the case of a two-dimensional semi-infinite medium, the solutions can be expressed in closed form. The elastic field is found to depend on the layer thickness and surface elastic constants, and the influence of surface energy is shown to be more significant under a horizontal load than under a vertical load. A characteristic length scale related to the surface material properties can be identified for the present class of problems. The solution for the indentation problem is considered for flat, conical and spherical rigid indenters. The mixed boundary-value problem corresponding to a rigid indenter is formulated in terms of a dual integral equation system that is solved by using numerical quadrature. Selected numerical results are presented to show the influence of the indenter shape, surface properties and size-dependency of response.
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6

Baudendistel, Craig M. "Effect of a Graded Layer on the Plastic Dissipation During Mixed-Mode Fatigue Crack Growth on Ductile Bimaterial Interfaces." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1368797452.

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7

Pahlow, Markus. "Atmospheric boundary layer dynamics and inversion technologies to obtain extinction coefficient profiles in the atmosphere from elastic lidar." Available to US Hopkins community, 2002. http://wwwlib.umi.com/dissertations/dlnow/3080740.

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8

Amirova, Svetlana R. "The influence of a simple shear deformation on a long wave motion in a pre-stressed incompressible elastic layer." Thesis, Keele University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.491831.

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9

Gupta, Shakti Singh. "Elastic constants from molecular mechanics simulations of frequencies of free-free single-walled carbon nanotubes and clamped single-layer graphene sheets." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/27576.

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Elastic constants of single-walled carbon nanotubes (SWCNTs) and single-layer graphene sheets (SLGSs) are determined by studying their free vibration characteristics using molecular mechanics (MM) simulations with the MM3 potential and finding their equivalent continuum structures (ECSs). The computational framework has been validated by comparing the presently computed basal plane stiffness and frequencies of radial breathing modes (RBMs) with those available in the literature. We have considered armchair, zigzag and chiral SWCNTs of aspect ratios (length/ diameter in the unloaded relaxed configuration) ranging from 2 to 15. The wall thickness of ECSs of SWCNTs is determined by applying continuum theories, viz., beam, shell and 3D-linear elasticity to ECSs and equating their frequencies with those of SWCNTs obtained from the MM simulations. An expression for the wall thickness of an ECS of a SWCNT in terms of its chiral indices is deduced. The wall thickness of an ECS of a SWCNT is found to increase with an increase in its radius and to saturate at 1.37 Ã for the radius exceeding 15 Ã . Poissonâ s ratio for zigzag SWCNTs decreses with an increase in the tube radius, but that for armchair SWCNTs exhibits the opposite trend. For the same radius, Poissonâ s ratio of a chiral SWCNT is slightly more than that for an armchair tube but a little less than that for a zigzag tube. For zigzag SWCNTs, frequencies of inextensional modes of vibration saturate with an increase in the circumferential wave number but those of their ECSs do not. The MM simulations of uniaxial tensile deformations of SLGSs of aspect ratios (length/width) ~ 10 give the basal plane stiffness of ~ 340 N/m. The MM simulations of free vibrations of clamped SLGSs and the analysis of vibrations of their ECSs with a continuum theory gives a wall thickness of ~ 1 Ã for a SLGS.
Ph. D.
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10

RADAMPOLA, Senanie Sujeewa, and senanie s. radampola@mainroads qld gov au. "EVALUATION AND MODELLING PERFORMANCE OF CAPPING LAYER IN RAIL TRACK SUBSTRUCTURE." Central Queensland University. Centre for Railway Engineering, 2006. http://library-resources.cqu.edu.au./thesis/adt-QCQU/public/adt-QCQU20060817.115415.

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In the design of rail track structures where the subgrade cannot achieve the desired capacity, enabling the required standard of track geometry to be maintained for the speed, axle load and tonnage to be hauled, a capping layer of granular material is placed between the natural ground or the embankment fill material and the ballast to protect the underlying weaker layers. In spite of the important role played by the capping layer, very little research has been carried out on its performance. The current practice of design of the capping layer, therefore, is based on working stress philosophy where reduced levels of stresses are assumed not to degrade the subgrade. Even on tracks containing a thick ballast layer that ensures allowable levels of working stress the subgrade has been found to have permanently deformed. Design of capping layers based on plastic deformation, therefore, appears appropriate. This thesis aims at determining the load levels that cause detrimental plastic deformation in the capping layer. The suite of material properties that characterise plastic deformations of capping layer is neither readily available nor easily determined. This thesis proposes a cheaper method of evaluating a range of capping layer material properties using penetration tests on specimens contained in California Bearing Ratio (CBR) test moulds coupled with a finite element modelling based back calculation technique. The suite of material properties thus determined are used for the simulation of the behaviour of capping layers under the boundary and loading conditions similar to those in practice. The predicted results are validated using laboratory experiments on large size capping layer specimens.
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Книги з теми "Elastic layer"

1

Reister, Heinrich. Numerische Simulation der Wechselwirkung von Druckwellen mit laminaren und turbulenten Grenzschichten. Koln: DFVLR, 1987.

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2

Babenko, Viktor Vitalʹevich. Pogranichnyĭ sloĭ na ėlastichnykh plastinakh. Kiev: Naukova dumka, 1993.

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3

Kovalev, Vladimir A. Elastic lidar: Theory, practice, and analysis methods. Hoboken, N.J: John Wiley, 2004.

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4

Mechanics, boundary layers, and function spaces. Boston: Birkhäuser, 1989.

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5

Willetts, Robert. An optoelectronic laser sensing system for the detection of surface elastic waves. Manchester: UMIST, 1997.

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6

Yu, Yi-Yuan. Vibrations of Elastic Plates: Linear and Nonlinear Dynamical Modeling of Sandwiches, Laminated Composites, and Piezoelectric Layers. New York, NY: Springer New York, 1996.

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7

Vibrations of elastic plates: Linear and nonlinear dynamical modeling of sandwiches, laminated composites, and piezoelectric layers. New York: Springer, 1996.

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8

Boundary Layer Flow over Elastic Surfaces. Elsevier, 2012. http://dx.doi.org/10.1016/c2011-0-06221-x.

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9

Boundary Layer Flow Over Elastic Surfaces And Combined Method Of Drag Reduction. Butterworth-Heinemann, 2012.

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10

Babenko, Viktor V., Ho-Hwan Chun, and Inwon Lee. Boundary Layer Flow over Elastic Surfaces: Compliant Surfaces and Combined Methods for Marine Vessel Drag Reduction. Elsevier Science & Technology, 2012.

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Частини книг з теми "Elastic layer"

1

Thomson, Gavin R., and Christian Constanda. "Layer Potentials." In Stationary Oscillations of Elastic Plates, 7–22. Boston: Birkhäuser Boston, 2011. http://dx.doi.org/10.1007/978-0-8176-8241-5_2.

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2

Teodorescu, Petre P. "Elastic Parallelepiped. Elastic Strip. Elastic Layer. Thick Plate." In Treatise on Classical Elasticity, 481–515. Dordrecht: Springer Netherlands, 2013. http://dx.doi.org/10.1007/978-94-007-2616-1_11.

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3

Chen, Y. C., and K. R. Rajagopal. "Stability of Deformation of an Elastic Layer." In Mechanics and Thermodynamics of Continua, 231–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-75975-8_12.

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4

Castro, Alberto, Lluís Gifre, Marc Ruiz, and Luis Velasco. "Restoration in the Optical Layer." In Provisioning, Recovery, and In-operation Planning in Elastic Optical Networks, 193–224. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119338628.ch9.

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5

Gong, Xu, Hongfa Yu, and Chengyou Wu. "Study on Deterioration Rule of Water-Binder Ratio on Mechanical Properties and Frost Resistance of Concrete." In Lecture Notes in Civil Engineering, 462–73. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-19-1260-3_42.

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AbstractBased on the rapid freeze-thaw (F-T) cycle test, the changes of relevant indexes (mass, relative dynamic elastic modulus, mechanical properties and thickness of concrete F-T damage layer) of concrete and mortar specimens with three water-binder ratios under F-T cycle was systematically studied. The results show that the quality, relative dynamic elastic modulus and mechanical properties of concrete and mortar decrease with the increase of F-T cycles, the thickness of F-T damaged layer of concrete increases in different degrees. The degree of F-T damage of mortar specimen is obviously lower than that of concrete specimen. Through regression analysis, it is find that the relative dynamic elastic modulus of concrete were significantly related to the relative dynamic elastic modulus of mortar, the thickness of concrete damage layer and the relative dynamic elastic modulus of concrete, it shows that one of the factors causing the F-T damage of concrete is the damage of mortar.
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6

Nakamura, Gen, and Günther Uhlmann. "A Layer Stripping Algorithm in Elastic Impedance Tomography." In Inverse Problems in Wave Propagation, 375–84. New York, NY: Springer New York, 1997. http://dx.doi.org/10.1007/978-1-4612-1878-4_18.

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7

Chimenti, D. E., and S. I. Rokhlin. "Reflection Coefficient of a Fluid-Coupled Elastic Layer." In Review of Progress in Quantitative Nondestructive Evaluation, 187–94. Boston, MA: Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5772-8_22.

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8

Kaplunov, Julius, Danila A. Prikazchikov, and Tomaž Savšek. "Dynamic Sliding Contact for a Thin Elastic Layer." In Recent Approaches in the Theory of Plates and Plate-Like Structures, 103–14. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-87185-7_9.

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9

You, Sung Jun, In Joon Jang, and Usik Lee. "Spectral Element Modeling for Elastic Two-Layer Beams." In Advanced Materials Research, 297–300. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-463-4.297.

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10

Turner, Russell, and Daniel Thalmann. "The Elastic Surface Layer Model for Animated Character Construction." In Communicating with Virtual Worlds, 399–412. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-68456-5_32.

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Тези доповідей конференцій з теми "Elastic layer"

1

Shen, Gangxiang. "Survivable Multi-layer Elastic optical Networks." In Asia Communications and Photonics Conference. Washington, D.C.: OSA, 2016. http://dx.doi.org/10.1364/acpc.2016.af3e.1.

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2

Hamidzadeh, Hamid R. "The Effect of Visco-Elastic Core Thickness on Modal Loss Factors of a Thick Three-Layer Cylinder." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35135.

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Анотація:
Free vibration of damped three-layer sandwich cylinders with thick layers is considered. In particular, the effect of the different thicknesses for the middle layer on the overall natural frequencies and modal damping factors are studied. The constrained layer damping is accomplished by sandwiching a linear visco-elastic material between two isotropic elastic cylinders with the same properties. The governing equations are derived using the theory of elasto-dynamic, by employing complex elastic moduli for the sandwiched layer. Dimensionless natural frequencies and modal loss-factors for the first three thickness modes associated with wave numbers of n = 0, 1, 2, 3, and 4 are tabulated for a range of thicknesses for the middle visco-elastic layer while keeping the thicknesses of inner and outer layers unchanged.
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3

Phani, A. Srikantha, and Norman A. Fleck. "Elastic Boundary Layers in Two-Dimensional Isotropic Lattices." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35234.

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The phenomenon of elastic boundary layers under quasistatic loading is investigated using the Floquet-Bloch formalism for two-dimensional, isotropic, periodic lattices. The elastic boundary layer is a region of localised elastic deformation, confined to the free-edge of a lattice. Boundary layer phenomena in three isotropic lattice topologies are investigated: the semi-regular Kagome lattice, the regular hexagonal lattice and the regular fully-triangulated lattice. The boundary layer depth is on the order of the strut length for the hexagonal and the fully-triangulated lattices. For the Kagome lattice, the depth of boundary layer scales inversely with the relative density. Thus, the boundary layer in a Kagome lattice of low relative density spans many cells.
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4

Stekhina, K. N., and D. N. Tumakov. "Diffraction of an elastic wave by the jump inhomogeneity in the elastic layer." In Days on Diffraction 2013 (DD). IEEE, 2013. http://dx.doi.org/10.1109/dd.2013.6712818.

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5

Li, Lin, Guangzhi Zhang, Xinpeng Pan, Qicui Tu, and Jiang Liu. "Layer anisotropic elastic parameters inversion based on Fourier coefficients of azimuthally elastic impedance." In SEG Technical Program Expanded Abstracts 2019. Society of Exploration Geophysicists, 2019. http://dx.doi.org/10.1190/segam2019-3215341.1.

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6

Diaconescu, Emanuel, and Marilena Glovnea. "A Boussinesq Type Problem for the Elastic Layer." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71265.

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This paper derives an analytical solution to the Boussinesq problem for the elastic layer. This is found by adding supplementary displacements to half-space displacements. The corresponding integral interference condition is established and this is useful for solving elastic layer contacts.
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7

Sisemore, Carl L., Ahmad A. Smaili, and Corinne M. Darvennes. "Experimental Measurement of Compressional Damping in an Elastic-Viscoelastic-Elastic Sandwich Beam." In ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0202.

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Abstract This article presents the results of an experimental investigation into the compressional vibration in an elastic-viscoelastic-elastic three-layer sandwich beam. The fundamental assumption of most of the current mathematical models is that shear deformation results in the largest energy losses for damping while compressional damping is negligible. In this experiment the relative displacements of the base beam and the constraining layer were measured directly to determine the amount of compression in the viscoelastic core. The experiment showed a maximum difference of 25% between the base beam and constraining layer motions. This suggests that neglecting compressional damping in the mathematical model is an erroneous assumption under most circumstances.
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8

Basu, Sumana. "AVO Response of a visco-elastic porous layer." In GEO 2008. European Association of Geoscientists & Engineers, 2008. http://dx.doi.org/10.3997/2214-4609-pdb.246.83.

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9

Makaryan, Vahagn, Michael Sutton, Tatevik Yeghiazaryan, Davresh Hasanyan, and Xiaomin Deng. "Cracked Elastic Layer Under a Compressive Mechanical Load." In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-11967.

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In the present work, the problem of an elastic layer weakened by a finite penny shaped crack parallel to a layer’s surface that is loaded in compression is considered. Assuming that the surfaces of the crack have frictional slipping contact, Henkel and Legendre integral transformation techniques are employed to formulate solutions in the form of an infinite system of linear algebraic equations. The regularity of the equations is established and closed-form solutions are obtained for stresses and strains. Assuming shear stress on the crack surfaces is linearly distributed, numerical results show both geometric and physical parameters have an essential influence on the stress distribution around the crack, with specific parameter values indicating the normal stress along the crack surface can change its sign from negative to positive. The implications of the work will be discussed.
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10

Karman Jr., Steve. "Unstructured Viscous Layer Insertion Using Linear-Elastic Smoothing." In 44th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2006. http://dx.doi.org/10.2514/6.2006-531.

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Звіти організацій з теми "Elastic layer"

1

Kiv, A. E., T. I. Maximova, and V. N. Soloviov. MD Simulation of the Ion-Stimulated Relaxation in Silicon Surface Layers. [б. в.], June 2000. http://dx.doi.org/10.31812/0564/1278.

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Thus it was established that ion bombardment of silicon surface in the energy region of the threshold of elastic displacement of atoms might allow to improve structural characteristics of surface lavers and to decrease the relaxation time. Energy dependencies of radiation induced processes show a possibility to improve the real staicture of Silicon surface and to accelerate the long-term surface relaxation in microelectronic technology.
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2

Newton, Ronald, Joseph Riov, and John Cairney. Isolation and Functional Analysis of Drought-Induced Genes in Pinus. United States Department of Agriculture, September 1993. http://dx.doi.org/10.32747/1993.7568752.bard.

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Drought is a common factor limiting timber production in the U.S. and Israel. Loblolly (Pinus taeda) and alleppo pine (Pinus halepensis) seedling survival is reduced when out planted, and growth and reproduction are often hindered by periodic droughts during later stages of tree development. Molecular and gene responses to drought stress have not been characterized. The objectives were to characterize drought-induced gene clones from these pines, to determine the effects of a growth regulator on drought tolerance, ABA levels, and drought-induced gene expression in alleppo pine, and to develop procedures for loblolly pine transformation. Nearly 20 cDNA clones influenced by gradual, prolonged drought stress have been isolated. Many of these have been shown to be induced by drought stress, whereas several others are down-regulated. These are the first drought-induced genes isolated from a pine species. Two genomic clones (lp5-1 and lp3-1) have been sequenced and characterized, and each has been found to be associated with a gene family. Clone lp5 appears to code for a cell wall protein, and clone lp3 codes for a nuclear protein. The former may be associated with changing the elastic properties of the cell wall, while the latter may be involved in signal transduction and/or protection from desiccation in the nucleus. Clone lp3 is similar to a drought-induced gene from tomato and is regulated by ABA. Several DNA sequences that are specific to induction during growth-retardation in alleppo pine by uniconazole have been identified. The active DNA species is now being identified. Promoters from genomic clones, lp3 and lp5, have been sequenced. Both are functional when fused with the gus reporter gene and transferred to other plant tissues as well as responding to a simulated drought stress. Through exodeletion analysis, it has been established that the promoter ABRE element of lp3 responds to ABA and that drought-induction of lp3 expression may also involve ABA. Stable tobacco transformants carrying either the lp5 or the lp3 promoter fused to a reporter gus gene have been obtained. The lp5lgus fusion was expressed at several stages of tobacco development and differentiation including the reproductive stage. There was no difference in phenotype between the transformants and the wild type. Embryogenesis procedures were developed for slash pine, but attempts to couple this process with gene transfer and plantlet transformation were not successful. Transformation of pine using Agrobacterium appears tractable, but molecular data supporting stable integration of the Agrobacterium-transferred gene are still inconclusive.
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