Journal articles: 'Viscoelastic Response'

1

Hill, R. M., and L. A. Dissado. "Viscoelastic response." Rheologica Acta 24, no. 5 (September 1985): 537–39. http://dx.doi.org/10.1007/bf01462503.

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Li, ZL, DG Sun, BH Han, B. Sun, X. Zhang, J. Meng, and FX Liu. "Response of viscoelastic damping system modeled by fractional viscoelastic oscillator." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 17 (April 6, 2016): 3169–80. http://dx.doi.org/10.1177/0954406216642477.

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The fractional model considering geometric factor of viscoelastic damping systems is proposed by adopting fractional viscoelastic oscillator. To obtain dynamic responses of the fractional model, a numerical method is derived based on matrix function theory and Grumwald–Letnikov discrete form of fractional derivative. As a special engineering application example, the vibration response of the viscoelastic suspension installed in heavy crawler-type vehicles is studied through the proposed model. Furthermore, the parameter influence on the vibration control capability of the viscoelastic suspension is researched. The results indicate that the fractional viscoelastic oscillator is a favorable choice to characterize the dynamic behavior of viscoelastic damping structures. Additionally, the parameters in fractional viscoelastic oscillator namely geometric factor and fractional order exert considerable impact on the dynamic response of viscoelastic damping structures.

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3

Charalambous, Haralambia P., Panayiotis C. Roussis, and Antonios E. Giannakopoulos. "Viscoelastic dynamic arterial response." Computers in Biology and Medicine 89 (October 2017): 337–54. http://dx.doi.org/10.1016/j.compbiomed.2017.07.028.

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4

McKnight, Scott J., Joseph Giangiacomo, and Edward Adelstein. "Inflammatory Response to Viscoelastic Materials." Ophthalmic Surgery, Lasers and Imaging Retina 18, no. 11 (November 1987): 804–6. http://dx.doi.org/10.3928/1542-8877-19871101-07.

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5

Conway, T. A., and G. A. Costello. "Viscoelastic Response of a Strand." Journal of Applied Mechanics 60, no. 2 (June 1, 1993): 534–40. http://dx.doi.org/10.1115/1.2900826.

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A method is presented in which the axial viscoelastic response of a multiple filament strand, constrained by a no-end rotation boundary condition, may be predicted. This method is an initial attempt to describe the time-dependent response of the multilayer strand by incorporating the stress relaxation data for a linearly viscoelastic construction material. Specifically, a strand consisting of a core filament, six filaments in the second layer, and twelve filaments in the outer layer is analyzed. This analysis could, however, include any number of layers of filaments where each layer has a concentric helix radius. The particular material used in this paper is polymethyl methacrylate (PMMA). The stress relaxation for PMMA is modeled analytically using the Schapery collocation method which determines the constant coefficient values for the elements of a Wiechert response model. Since this is a first approximation model, the approach is limited to linear viscoelasticity. The geometric effects of the strand are then combined with the Wiechert response model to develop a system of convolution integrals which satisfy the equilibrium and imposed boundary conditions for the multiple filament strand construction. The solutions for these integrals are approximated numerically using a modified Newton’s iterative method combined with a numerical technique which takes into account the material’s stress-strain history.

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6

Kovalev, Alexander, Alexander Filippov, and Stanislav N. Gorb. "Slow viscoelastic response of resilin." Journal of Comparative Physiology A 204, no. 4 (January 24, 2018): 409–17. http://dx.doi.org/10.1007/s00359-018-1248-2.

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7

Walrath, David E. "Viscoelastic response of a unidirectional composite containing two viscoelastic constituents." Experimental Mechanics 31, no. 2 (June 1991): 111–17. http://dx.doi.org/10.1007/bf02327561.

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8

Chen, Cai Ying, Ke Lun Wei, and Gui Qiang Yang. "Seismic Response Analysis of Fuyang River Aqueduct." Advanced Materials Research 912-914 (April 2014): 1739–42. http://dx.doi.org/10.4028/www.scientific.net/amr.912-914.1739.

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In this paper, using finite element software ANSYSanalyzes seismic respons of Fuyang river aqueduct, respectively establishfinite element model under viscoelastic boundary conditions and elasticboundary conditions, compare and analyze seismic respons of aqueduct structureunder two kinds of boundary conditions. The results show that, compared withelastic boundary conditions, viscoelastic boundary conditions not only cansimulate elastic recovery performance of foundation, but also can realizeinfinite medium radiation damping, and viscoelastic boundary conditions is moreclose to the actual situation.

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9

Seredyńska, M., and A. Hanyga. "Cones of material response functions in one-dimensional and anisotropic linear viscoelasticity." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 465, no. 2112 (September 25, 2009): 3751–70. http://dx.doi.org/10.1098/rspa.2009.0305.

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Viscoelastic materials have non-negative relaxation spectra. This property implies that viscoelastic response functions satisfy certain necessary and sufficient conditions. These conditions can be expressed in terms of each viscoelastic response function ranging over a cone. The elements of each cone are completely characterized by an integral representation. The 1:1 correspondence between the viscoelastic response functions is expressed in terms of cone-preserving mappings and their inverses. The theory covers scalar- and tensor-valued viscoelastic response functions.

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10

Bazzaz, Mohammad, Masoud K. Darabi, Dallas N. Little, and Navneet Garg. "A Straightforward Procedure to Characterize Nonlinear Viscoelastic Response of Asphalt Concrete at High Temperatures." Transportation Research Record: Journal of the Transportation Research Board 2672, no. 28 (July 3, 2018): 481–92. http://dx.doi.org/10.1177/0361198118782033.

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This paper proposes a straightforward procedure to characterize the nonlinear viscoelastic response of asphalt concrete materials. Furthermore, a model is proposed to estimate the nonlinear viscoelastic parameters as a function of the triaxiality ratio, which accounts for both confinement and deviatoric stress levels. The simplified procedure allows for easy characterization of linear viscoelastic (LVE) and nonlinear viscoelastic (NVE) responses. First, Schapery’s nonlinear viscoelastic model is used to represent the viscoelastic behavior. Dynamic modulus tests are performed to calibrate LVE properties. Repeated creep-recovery tests at variable deviatoric stress levels (RCRT-VS) were designed and conducted to calibrate the nonlinear viscoelastic properties of four types of mixtures used in the Federal Aviation Administration’s National Airport Pavement and Materials Research Center test sections. The RCRT-VS were conducted at 55°C, 140 kPa initial confinement pressure, and wide range of deviatoric stress levels; mimicking the stress levels induced in a pavement structure under traffic. Once calibrated, the model was validated by comparing the model predictions and experimental measurements at different deviatoric stress levels. The predictions indicate that the proposed method is capable of characterizing NVE response of asphalt concrete materials.

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11

Liu, Lin Chao, Lie Yu, and Huan Xin Yu. "Steady State Response of Compressible Fractional Derivative Viscoelastic Thick-Walled Cylinder." Applied Mechanics and Materials 166-169 (May 2012): 1510–13. http://dx.doi.org/10.4028/www.scientific.net/amm.166-169.1510.

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Many materials show viscoelastic properties under long term load, because of the complexity of viscoelastic problem, it is not enough for describing the characteristics of material and structure with classic viscoelastic model. The stress-strain constitutive relationship is described by fractional derivative viscoelastic model, the radial displacement and stress of thick-walled cylinder under internal pressure are obtained by using Fourier transform and the properties of fractional derivative, and we also investigated the steady state response of compressible fractional derivative viscoelastic thick-walled cylinder.

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12

Yang, Shao-Chong, and Qing-Sheng Yang. "Geometrically Nonlinear Transient Response of Laminated Plates with Flexible Supports." International Journal of Structural Stability and Dynamics 18, no. 02 (February 2018): 1871002. http://dx.doi.org/10.1142/s0219455418710025.

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Laminated plates are loading-bearing components that are generally connected to flexible pads and exhibit complicated mechanical responses. To investigate the geometrically nonlinear transient responses of a laminated plate with flexible pad supports, a varied constraint reaction model and a systematic numerical procedure are presented in this paper. The flexible pad supports of the plate were treated as viscoelastic boundary conditions, wherein the strip-type pad per unit length was modeled as a cantilever beam. The nonlinear Kelvin–Voigt model was developed to simulate the nonlinear viscoelastic behaviors of the flexible pads. The dynamically varied constraint reactions generated by the viscoelastic supports, which depend upon the displacement and velocity of the nodes along the plate edge, were determined by the deflection and slope equations of the beam theory used, and they were applied on the plate edges by using the nonlinear load functions. Thus, the dynamical responses of the laminated plate with viscoelastic supports were obtained. Numerical results show that the present method can effectively treat the geometrically nonlinear transient response of the laminated plate with viscoelastic supports, and it is essential to consider the effects of non-ideal boundary conditions in the nonlinear transient analysis.

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13

Wineman, Alan. "Mechanical Response of Linear Viscoelastic Solids." MRS Bulletin 16, no. 8 (August 1991): 19–23. http://dx.doi.org/10.1557/s088376940005627x.

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The word “viscoelastic” is used to describe the mechanical response of materials exhibiting both the springiness associated with elastic solids and viscous flow characteristics associated with fluids. A familiar example of a material called viscoelastic is Silly PuttyTM. If a blob of Silly Putty is rolled into a ball and then dropped onto a hard surface, it will bounce like an elastic ball. If the ball is placed on a hard surface, its own weight will cause it to flow into a puddle. This behavior indicates that time is an intrinsic parameter in discussing viscoelastic response of materials. The elastic response is associated with a contact force of very short duration. The flow into a puddle occurs when forces act for a long period of time.Viscoelastic response occurs in materials such as soils, concrete, cartilage, biological tissue, and polymers. Soils and cartilage can be thought of as porous solids filled with fluid. Viscous response is due to the flow of the fluid in the pores; elastic response is due to the distortion of the porous solid.

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14

Rossikhin, Yu A., M. V. Shitikova, and I. I. Popov. "Dynamic response of a viscoelastic beam impacted by a viscoelastic sphere." Computers & Mathematics with Applications 73, no. 6 (March 2017): 970–84. http://dx.doi.org/10.1016/j.camwa.2016.05.009.

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15

Megnis, Modris, Janis Varna, David H. Allen, and Anders Holmberg. "Micromechanical Modeling of Viscoelastic Response of GMT Composite." Journal of Composite Materials 35, no. 10 (May 15, 2001): 849–82. http://dx.doi.org/10.1177/a037319.

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Experimental studies have been performed to obtain creep compliance functions of polypropylene (PP) and Glass Mat reinforced Thermoplastics (GMT) with PP matrix. It was found that both GMT and PP in the considered loading region may be considered as linear viscoelastic materials. The obtained viscoelastic compliance functions were successfully used to describe material behavior in the stress relaxation test. A micromechanical model based on the correspondence principle in the Laplace domain was developed to describe the viscoelastic behavior of GMT. This model considers the GMT composite with a given fiber orientation distribution function as consisting of an infinite number of unidirectional layers with orientations corresponding to this distribution function. The viscoelastic properties of the unidirectional layer are calculated using Hashin's concentric cylinder model that uses the experimentally determined viscoelastic properties of PP matrix. The predictions for GMT have been compared with experimental data. The model predicts rather good initial properties of GMT but it gives slightly less time dependence than compared to experimental data for both relaxation functions and compliance. The cause of the difference (debonding) between matrix and fiber, nonuniform fiber spatial distribution, stress concentrations etc.) is discussed.

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16

ZHANG, LIXIN, JEAN W. ZU, and Z. ZHONG. "TRANSIENT RESPONSE OF VISCOELASTIC MOVING BELTS USING BLOCK-BY-BLOCK METHOD." International Journal of Structural Stability and Dynamics 02, no. 02 (June 2002): 265–80. http://dx.doi.org/10.1142/s021945540200049x.

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The linear, viscoelastic, integral constitutive law is employed to model the viscoelastic characteristic of belt materials. By assuming the translating eigenfunctions instead of stationary eigenfunctions to be the spatial solutions, the governing equation is reduced to differential-integral equations in time, which are then solved by the block-by-block method. The transient amplitudes of parametrically excited viscoelastic moving belts with uniform and non-uniform travelling speed are obtained. The effects of viscoelastic parameters and perturbed axial velocity on the system response are also investigated.

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17

Cohen-Addad, Sylvie, Hussein Hoballah, and Reinhard Höhler. "Viscoelastic response of a coarsening foam." Physical Review E 57, no. 6 (June 1, 1998): 6897–901. http://dx.doi.org/10.1103/physreve.57.6897.

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18

Rajagopal, K. R., and A. S. Wineman. "Response of Anisotropic Nonlinearly Viscoelastic Solids." Mathematics and Mechanics of Solids 14, no. 5 (March 11, 2008): 490–501. http://dx.doi.org/10.1177/1081286507085377.

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19

Lowe, C. P., and A. J. Masters. "The viscoelastic response of Brownian suspensions." Journal of Chemical Physics 111, no. 18 (November 8, 1999): 8708–20. http://dx.doi.org/10.1063/1.480211.

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20

Flintsch, Gerardo W., and Samer W. Katicha. "Hot-Mix Asphalt Linear Viscoelastic Response." Road Materials and Pavement Design 11, no. 2 (January 2010): 489–98. http://dx.doi.org/10.1080/14680629.2010.9690286.

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21

Sun, Liang, and Shaolong Wan. "Chiral viscoelastic response in Weyl semimetals." EPL (Europhysics Letters) 108, no. 3 (November 1, 2014): 37007. http://dx.doi.org/10.1209/0295-5075/108/37007.

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22

Tzeng, Jerome T. "Viscoelastic Response of Composite Overwrapped Cylinders." Journal of Thermoplastic Composite Materials 12, no. 1 (January 1999): 55–69. http://dx.doi.org/10.1177/089270579901200106.

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23

Clarke, S. M., A. R. Tajbakhsh, E. M. Terentjev, and M. Warner. "Anomalous Viscoelastic Response of Nematic Elastomers." Physical Review Letters 86, no. 18 (April 30, 2001): 4044–47. http://dx.doi.org/10.1103/physrevlett.86.4044.

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24

Morland, L. W. "Non-linear viscoelastic response of ice." Applied Ocean Research 13, no. 5 (October 1991): 254–61. http://dx.doi.org/10.1016/s0141-1187(05)80049-5.

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25

Tuah, Hang, and J. W. Leonard. "Dynamic response of viscoelastic cable elements." Ocean Engineering 17, no. 1-2 (January 1990): 23–34. http://dx.doi.org/10.1016/0029-8018(90)90012-u.

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26

Laura, P. A. A. "Dynamic response of viscoelastic cable elements." Ocean Engineering 18, no. 5 (January 1991): 517–18. http://dx.doi.org/10.1016/0029-8018(91)90028-o.

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27

SHROTRIYA, P., and N. SOTTOS. "Viscoelastic response of woven composite substrates." Composites Science and Technology 65, no. 3-4 (March 2005): 621–34. http://dx.doi.org/10.1016/j.compscitech.2004.09.002.

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28

Drozdov, A. D., E. A. Jensen, and J. de C. Christiansen. "Thermo-viscoelastic response of nanocomposite melts." International Journal of Engineering Science 46, no. 2 (February 2008): 87–104. http://dx.doi.org/10.1016/j.ijengsci.2007.09.004.

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29

Pasquino, R., B. Zhang, R. Sigel, H. Yu, M. Ottiger, O. Bertran, C. Aleman, A. D. Schlüter, and D. Vlassopoulos. "Linear Viscoelastic Response of Dendronized Polymers." Macromolecules 45, no. 21 (October 29, 2012): 8813–23. http://dx.doi.org/10.1021/ma301029t.

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30

Nikiforidis, G., C. Balas, and D. Tsambaos. "Viscoelastic response of human hair cortex." Medical & Biological Engineering & Computing 30, no. 1 (January 1992): 83–88. http://dx.doi.org/10.1007/bf02446198.

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31

Conway, Ted A., and George A. Costello. "Viscoelastic response of a simple strand." International Journal of Solids and Structures 30, no. 4 (1993): 553–67. http://dx.doi.org/10.1016/0020-7683(93)90187-c.

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32

Cederbaum, G., and J. Aboudi. "Dynamic response of viscoelastic laminated plates." Journal of Sound and Vibration 133, no. 2 (September 1989): 225–38. http://dx.doi.org/10.1016/0022-460x(89)90923-1.

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33

Ross, T. J. "Dynamic Rate Effects on Timoshenko Beam Response." Journal of Applied Mechanics 52, no. 2 (June 1, 1985): 439–45. http://dx.doi.org/10.1115/1.3169066.

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The problem of a viscoelastic Timoshenko beam subjected to a transversely applied step-loading is solved using the Laplace transform method. It is established that the support shear force is amplified more than the support bending moment for a fixed-end beam when strain rate influences are accounted for implicitly in the viscoelastic constitutive formulation.

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34

Zhang, Guoqi, Zhiqiang Wu, and Yajie Li. "Nonlinear Dynamic Analysis of Fractional Damped Viscoelastic Beams." International Journal of Structural Stability and Dynamics 19, no. 11 (October 23, 2019): 1950129. http://dx.doi.org/10.1142/s0219455419501293.

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The nonlinear dynamical response of a simply supported viscoelastic beam subjected to transverse harmonic excitations is investigated. The constitutive law of the viscoelastic beam is modeled in the fractional derivative Kelvin sense. The mathematical model is derived and discretized to a set of ordinary differential equations by Galerkin approximation method. The steady-state response of a single-mode system is obtained by the averaging method. Numerical results are obtained by an algorithm based on the fractional-order Grünwald–Letnikov definition, and compared with the analytical ones for verification. A parametric study and singularity analysis are carried out to determine the influence of the coefficients of the material’s constitutive equation on the responses. To study the effect of beam length and nonlinear coefficient on the nonlinear dynamic response, a numerical simulation is carried out. The periodic, multiple periodic, and chaotic responses are determined using Poincaré section bifurcation diagrams of the local maximum displacement. The above analysis allows us to optimize parametric design scheme for the viscoelastic beam.

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35

Yang, Liming, Junhui Luo, Weiyun Chen, and Yumin Mou. "Amplification of Seismic Response in Poroviscoelastic Soil Layer." Advances in Civil Engineering 2020 (July 11, 2020): 1–12. http://dx.doi.org/10.1155/2020/8824445.

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The time-dependent behaviour of saturated soils under static and dynamic loading is generally attributed to the flow-dependent and viscous behaviour of pore fluid. However, the intrinsic energy dissipative effects from the flow-independent viscoelastic behaviour of solid skeleton are not always considered. In this study, the effect of flow-independent viscoelastic behaviour on the seismic amplification of ground soil in vertical and horizontal directions is studied based on a two-phase poroviscoelastic model. A generalized Kelvin–Voigt model is used to define the effective stress in the soils, and the compressibilities of both solid skeleton and pore fluid are considered. The seismic-induced dynamic displacements are analytically derived and are shown to depend on soil layer thickness, soil properties, and ground motion parameters. The formulation neglecting the viscoelastic behaviour of solid skeleton could overestimate both the vertical and horizontal motion amplifications at the surface of ground soil. In addition, the seismic responses of viscoelastic soils are demonstrated to be closely related to the saturation state of surface soil.

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36

Lobo, R. F., J. M. Bracci, K. L. Shen, A. M. Reinhorn, and T. T. Soong. "Inelastic Response of R/C Structures with Viscoelastic Braces." Earthquake Spectra 9, no. 3 (August 1993): 419–46. http://dx.doi.org/10.1193/1.1585723.

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The addition of viscoelastic braces in structures for vibration reduction has been proposed and implemented in the past decade in metal scaled models of full-scale structures. Viscoelastic braces can provide energy dissipation, while the structure remains elastic. In reinforced concrete structures, the seismic response is usually inelastic, which is often accompanied by permanent deformations and damage. The addition of viscoelastic dampers can dissipate energy at the early stages of cracking of the concrete elements and reduce the development of damage. With proper selection of dampers, this damage can be substantially reduced or even eliminated. However the addition of viscoelastic dampers may stiffen the structure unnecessarily producing increased inertial forces and base shears when subjected to seismic motion. The quantification of the influence of viscous damping and elastic stiffness properties of dampers during the inelastic response of reinforced concrete structures is the subject of this investigation. Models for analysis of inelastic response with damage indexing for reinforced concrete structures that include viscoelastic braces are developed and calibrated using experimental data produced by shaking table tests. These models are then used to determine the variation of expected damage in the presence of damping and quantify the hysteretic energy dissipation along with the damping energy.

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37

Kiasat, M. S., H. A. Zamani, and M. M. Aghdam. "On the transient response of viscoelastic beams and plates on viscoelastic medium." International Journal of Mechanical Sciences 83 (June 2014): 133–45. http://dx.doi.org/10.1016/j.ijmecsci.2014.03.007.

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38

DiSilvestro,, Mark R., Qiliang Zhu,, and Jun-Kyo Francis Suh. "Biphasic Poroviscoelastic Simulation of the Unconfined Compression of Articular Cartilage: II—Effect of Variable Strain Rates." Journal of Biomechanical Engineering 123, no. 2 (October 1, 2000): 198–200. http://dx.doi.org/10.1115/1.1351887.

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This study investigated the abilities of the linear biphasic poroviscoelastic (BPVE) model and the linear biphasic poroelastic (BPE) model to simulate the effect of variable ramp strain rates on the unconfined compression stress relaxation response of articular cartilage. Curve fitting of experimental data showed that the BPVE model was able to successfully account for the ramp strain rate-dependent viscoelastic behavior of articular cartilage under unconfined compression, while the BPE model was able to account for the complete viscoelastic response at a slow strain rate, but only the long-term viscoelastic response at faster strain rates. We concluded that the short-term viscoelastic behavior of articular cartilage, when subjected to a fast ramp strain rate, is primarily governed by a fluid flow-independent (intrinsic) viscoelastic mechanism, whereas the long-term viscoelastic behavior is governed by a fluid flow-dependent (biphasic) viscoelastic mechanism. Furthermore, a linear viscoelastic representation of the solid stress was found to be a valid model assumption for the simulation of ramp strain rate-dependent relaxation behaviors of articular cartilage within the range of ramp strain rates investigated.

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Koruk, H. "Development of an improved mathematical model for the dynamic response of a sphere located at a viscoelastic medium interface." European Journal of Physics 43, no. 2 (January 11, 2022): 025002. http://dx.doi.org/10.1088/1361-6404/ac4647.

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Abstract A comprehensive investigation on the static and dynamic responses of a sphere located at elastic and viscoelastic medium interfaces is performed in this study. First, the mathematical models commonly used for predicting the static displacement of a sphere located at an elastic medium interface are presented and their performances are compared. After that, based on the finite element analyses, an accurate mathematical model to predict the static displacement of a sphere located at an elastic medium interface valid for different Poisson’s ratios of the medium and small and large sphere displacements is proposed. Then, an improved mathematical model for the dynamic response of a sphere located at a viscoelastic medium interface is developed. In addition to the Young’s modulus of the medium and the radius of the sphere, the model takes into account the density, Poisson’s ratio and viscosity of the medium, the mass of the sphere and the radiation damping. The effects of the radiation damping, the Young’s modulus, density and viscosity of the medium and the density of the sphere on the dynamic response of the sphere located at a viscoelastic medium interface are explored. The developed model can be used to understand the dynamic responses of spherical objects located at viscoelastic medium interfaces in practical applications. Furthermore, the proposed model is a significant tool for graduate students and researchers in the fields of engineering, materials science and physics to gain insight into the dynamic responses of spheres located at viscoelastic medium interfaces.

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40

Yao, Ji, Liang Cao, Hui Min Wang, Li Jie Zhang, Liang Wu, and Shan Guang Qian. "Dynamic Time History Analysis on Groundwater Hydraulic Tunnel under Three Dimensional Viscoelastic Boundary Conditions." Applied Mechanics and Materials 302 (February 2013): 622–27. http://dx.doi.org/10.4028/www.scientific.net/amm.302.622.

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The three dimensional finite element model of a groundwater hydraulic tunnel was eatablished in this paper by FEM software ANSYS, two seismic waves of bedrock wave and EI-centro wave in similar sites were entered, and dynamic time history method was applied to compare the seismic response of the two hydraulic tunnels which were under rigid boundary conditions and viscoelastic boundary conditions respectively. The results showed that, the dynamic response of the model under rigid boundary conditions was larger than the response under viscoelastic boundary, and the viscoelastic boundary was closer to the actual situation. Under viscoelastic boundary conditions, the smaller depth of the hydraulic tunnel, the more intensive of the seismic response.

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41

Grigg, P., D. R. Robichaud, and Z. Del Prete. "Properties of Mouse Cutaneous Rapidly Adapting Afferents: Relationship to Skin Viscoelasticity." Journal of Neurophysiology 92, no. 2 (August 2004): 1236–40. http://dx.doi.org/10.1152/jn.01033.2003.

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When skin is stretched, stimuli experienced by a cutaneous mechanoreceptor neuron are transmitted to the nerve ending through the skin. In these experiments, we tested the hypothesis that the viscoelastic response of the skin influences the dynamic response of cutaneous rapidly adapting (RA) neurons. Cutaneous RA afferent neurons were recorded in 3 species of mice (Tsk, Pallid, and C57BL6) whose skin has different viscoelastic properties. Isolated samples of skin and nerve were stimulated mechanically with a dynamic stretch stimulus, which followed a pseudo Gaussian waveform with a bandwidth of 0–60 Hz. The mechanical response of the skin was measured as were responses of single RA cutaneous mechanoreceptor neurons. For each neuron, the strength of association between spike responses and the dynamic and static components of stimuli were determined with multiple logistic regression analysis. The viscoelastic material properties of each skin sample were determined indirectly, by creating a nonlinear (Wiener–Volterra) model of the stress–strain relationship, and using the model to predict the complex compliance (i.e., the viscoelastic material properties). The dynamic sensitivity of RA mechanoreceptor neurons in mouse hairy skin was weakly related to the viscoelastic properties of the skin. Loss modulus and phase angle were lower (indicating a decreased viscous component of response) in Tsk and Pallid than in C57BL6 mice. However, RA mechanoreceptor neurons in Tsk and Pallid skin did not differ from those in C57 skin with regard to their sensitivity to the rate of change of stress or to the rate of change of incremental strain energy. They did have a decreased sensitivity to the rate of change of tensile strain. Thus the skin samples with lower dynamic mechanical response contained neurons with a somewhat lower sensitivity to dynamic stimuli.

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42

Zhang, Tao, Deng Pan, and Jin Chao Yue. "Seismic Response Analysis of Prestressed Concrete Bridge." Applied Mechanics and Materials 556-562 (May 2014): 675–78. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.675.

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Using large-scale finite element analysis software ANSYS analyzes seismic respons of prestressed concrete bridge, respectively establish finite element model under viscoelastic boundary conditions and elastic boundary conditions, compare and analyze seismic respons of bridge structure under two kinds of boundary conditions. Compared with elastic boundary conditions, viscoelastic boundary conditions not only can simulate elastic recovery performance of foundation, but also can realize infinite medium radiation damping. The research results provide the basis for the seismic design and protection of bridge.

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43

Li, Pei Long, Zhan Ding, and Zheng Qi Zhang. "Influence of Aging on Viscoelastic Response of Asphalt Mixture." Advanced Materials Research 255-260 (May 2011): 3350–53. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.3350.

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Two gradations of asphalt mixtures were conducted to short term and long term aging tests. And then, static creep test was implemented on the samples of mixture. According to creep compliance curves from the stress-strain relations, Burgers viscoelastic model parameters were got to analyze the influences of aging effect on the viscoelastic response of asphalt mixture. The results and analysis indicated that aging is an important reason introducing viscoelasticity changes of asphalt mixture. For aged asphalt mixtures, the stiffness increases, the flexibility declines, the instantaneous elastic and the viscous compliance decrease. But short-term aging and long-term aging have different effects. And the viscoelastic parameters of the asphalt mixture with large voids vary more significantly, so aging process is much faster.

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Yancey, R. N., and Marek-Jerzy Pindera. "Micromechanical Analysis of the Creep Response of Unidirectional Composites." Journal of Engineering Materials and Technology 112, no. 2 (April 1, 1990): 157–63. http://dx.doi.org/10.1115/1.2903302.

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The paper outlines the use of the micromechanics model proposed by Aboudi in predicting the creep response of unidirectional composites consisting of linearly viscoelastic matrices and elastic fibers. The closed-form expressions for the effective elastic moduli given in terms of the phase moduli and volume fractions provided by the micromechanics model facilitate a straightforward application of the viscoelastic Correspondence Principle. The inversion of the effective moduli in the Laplace transform domain to the time domain is subsequently accomplished using the Bellman method. The predictions of the model are compared with the creep response of T300/934 graphite/epoxy unidirectional coupons at two different temperatures. Very good correlation between theory and experiment is illustrated for the linearly viscoelastic response characterized by relatively small creep strains.

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Stacer, R. G., D. M. Husband, and H. L. Stacer. "Viscoelastic Response and Adhesion Properties of Highly Filled Elastomers." Rubber Chemistry and Technology 60, no. 2 (May 1, 1987): 227–44. http://dx.doi.org/10.5254/1.3536127.

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Abstract The viscoelastic response of four highly-filled elastomers has been investigated. Small deformation dynamic testing of these materials reveals thay they are nonlinear viscoelastic, as well as thermorheologically complex. Nonlinear viscoelastic behavior was observed as a pronounced strain dependence in the range of 0.1 to 10%. The degree of this nonlinear response was quantified through a constitutive equation containing a single nonlinear factor; resultant nonlinear factors for the various materials were compared and evaluated. Thermorheologically complex behavior was displayed by slightly different shift coefficients to superpose G'′ and G″ data. An approach for calculating material resilience from the viscoelastic data was also developed and a nomographic technique presented for its application. A composite adhesive joint, consisting of two layers of a filled NBR compound bonded together by a filled putty interlayer, was also studied. It was found that both the adhesive fracture energy and the effect of interlayer thickness could be related to the loss modulus of the putty interlayer. Finally, the effect of contact time on bond strength was evaluated and results presented as a master curve of adhesive fracture energy vs. temperature-reduced contact time.

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Page, Jacob, and Tamer A. Zaki. "Streak evolution in viscoelastic Couette flow." Journal of Fluid Mechanics 742 (February 21, 2014): 520–51. http://dx.doi.org/10.1017/jfm.2013.686.

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AbstractThe combined effect of inertia and elasticity on streak amplification in planar Couette flow of an Oldroyd-B fluid is examined. The linear perturbation equations are solved in the form of a forced-response problem to obtain the wall-normal vorticity response to a decaying streamwise vortex. With significant disparity between the solvent diffusion and polymer relaxation time scales, two distinct responses are possible. The first is termed ‘quasi-Newtonian’ because the streak evolution collapses onto the Newtonian behaviour at the same total and solvent Reynolds numbers when relaxation is very fast or slow, respectively. The second response is labelled ‘elastic’: with a long relaxation time, the streaks can reach significant amplitudes even with very weak inertia. If the diffusion and relaxation time scales are commensurate, the streaks are able to re-energize in a periodic cycle within an envelope of overall decay. This behaviour is enhanced in the instantaneously elastic limit, where the governing equation reduces to a forced wave equation. The streak re-energization is demonstrated to be a superposition of trapped vorticity waves.

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Tao, Gui Lan, and Li Zhang. "Dynamic Response Analysis of Docking Chamber Structure Considering Viscoelastic Boundary Condition." Applied Mechanics and Materials 405-408 (September 2013): 1939–44. http://dx.doi.org/10.4028/www.scientific.net/amm.405-408.1939.

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Spring-damper units were set on the boundaries to absorb incident waves and reflected scattering waves to realize viscoelastic artificial boundary (VAB). The equivalent node load input method was used to simulate the VAB and viscoelastic boundary element wave input. Programming is based on APDL secondary development language with ANSYS finite element software. Considering the interaction between chamber structure and the surrounding soil, docking chamber structure dynamic model is established based on the VAB. The linear elastic model was used for concrete structure. The D-P nonlinear model was used for the back soil calculation. Docking chamber structure dynamic analysis under conditions of fixed boundaries and viscoelastic boundaries were conducted. The result indicated that under the viscoelastic boundary conditions, dynamic acceleration response is significant on the top of the lock wall, which is approximately 2.5 times of the value on the bottom of the lock wall. The maximum response stress appears near the cross point of the lock wall and the bottom floor with value of approximately 5620 kPa;.The chamber bottom floor is subjected to tension and maximum stress with the value of approximately 6180 kPa. Usually, the structure response under the fixed boundary conditions is higher than the structure response under the viscoelastic boundary conditions.

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Drozdov, Aleksey D. "Nonlinear Viscoelastic Response of Thermoplastic-Elastomer Melts." Advances in Applied Mathematics and Mechanics 2, no. 1 (June 2010): 1–31. http://dx.doi.org/10.4208/aamm.09-m0938.

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Drozdov, Aleksey D., and Jesper deClaville Christiansen. "Thermo-Viscoelastic Response of Protein-Based Hydrogels." Bioengineering 8, no. 6 (May 31, 2021): 73. http://dx.doi.org/10.3390/bioengineering8060073.

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Because of the bioactivity and biocompatibility of protein-based gels and the reversible nature of bonds between associating coiled coils, these materials demonstrate a wide spectrum of potential applications in targeted drug delivery, tissue engineering, and regenerative medicine. The kinetics of rearrangement (association and dissociation) of the physical bonds between chains has been traditionally studied in shear relaxation tests and small-amplitude oscillatory tests. A characteristic feature of recombinant protein gels is that chains in the polymer network are connected by temporary bonds between the coiled coil complexes and permanent cross-links between functional groups of amino acids. A simple model is developed for the linear viscoelastic behavior of protein-based gels. Its advantage is that, on the one hand, the model only involves five material parameters with transparent physical meaning and, on the other, it correctly reproduces experimental data in shear relaxation and oscillatory tests. The model is applied to study the effects of temperature, the concentration of proteins, and their structure on the viscoelastic response of hydrogels.

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Simpson, Benjamin Scott, Michael Burns, Robert P. Dick, and Leif Saager. "Epidural Needle Guidance Using Viscoelastic Tissue Response." IEEE Journal of Translational Engineering in Health and Medicine 10 (2022): 1–11. http://dx.doi.org/10.1109/jtehm.2022.3152391.

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Journal articles on the topic 'Viscoelastic Response'

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