نتایج جستجو برای: viscoelastic

تعداد نتایج: 13111  

2017
M H Mehrabi Meldi Suhatril Zainah Ibrahim S S Ghodsi Hamed Khatibi

Conventional seismic rehabilitation methods may not be suitable for some buildings owing to their high cost and time-consuming foundation work. In recent years, viscoelastic dampers (VEDs) have been widely used in many mid- and high-rise buildings. This study introduces a viscoelastic passive control system called rotary rubber braced damper (RRBD). The RRBD is an economical, lightweight, and e...

Journal: :journal of petroleum science and technology 0
bader h. albusairi kuwait university adam al-mulla kuwait university

the rheological properties of four different kuwaiti crude oils in the presence of polyacrylamide (paa) were investigated. paa was varied at three different concentrations of 25, 50, and 75 ppm to study the viscoelastic properties in the untreated samples. four different temperatures (25, 30, 35, and 40 °c) were used to evaluate different viscoelastic parameters of the treated and untreated kuw...

Journal: :journal of dentistry, tehran university of medical sciences 0
abbas monzavi associate professor, laser research center of dentistry, dentistry research institute, department of prosthodontics, tehran university of medical sciences, tehran, iran. hakimeh siadat associate professor, dental implant research center, dentistry research institute, department of prosthodontics, tehran university of medical sciences, tehran, iran. mohammad atai professor, iran polymer and petrochemical institute (ippi), tehran, iran. marzieh alikhasi associate professor, dental research center, dentistry research institute, department of prosthodontics, tehran university of medical sciences, tehran, iran. vahideh nazari resident of prosthodontics, tehran university of medical sciences, tehran, iran. sadigheh sheikhzadeh resident of orthodontics, tehran university of medical sciences, tehran, iran.

little is known about the interaction of tissue conditioners and modeling plastics. this study evaluates the influence of a variety of commercial tissue conditioners on alteration of viscoelastic properties of modeling plastics.in this in vitro study, the dynamic viscoelastic properties of four commercially available tissue conditioners (tc), visco-gel (vg), gc soft-liner (sl), fitt (ft), and c...

Journal: :Computers & Mathematics with Applications 2013
Zheng Xu Wen Chen

This paper describes our experimental testing of linear viscoelastic creep behaviours in HamiMelon. Experimental data shows that HamiMelon has complex viscoelastic property which cannot be well described by the standard model. Consequently, this study develops a fractional derivative model to describe such complex viscoelastic creep behaviours of Hami Melon. The analytical creep function of the...

Journal: :Computers in biology and medicine 2004
Chandler A. Phillips Daniel W. Repperger A. T. Neidhard-Doll David Reynolds

This paper describes a revision of the Hill-type muscle model so that it will describe the chemo-mechanical energy conversion process (energetic) and the internal-element stiffness variation (viscoelastic) during a skeletal muscle isometric force twitch contraction. The derivation of this energetic-viscoelastic model is described by a first-order linear ordinary differential equation with const...

2010
X. Y. Zhu

A fast multipole formulation for 2D linear viscoelastic problems is presented in this paper by incorporating the elastic–viscoelastic correspondence principle. Systems of multipole expansion equations are formed and solved analytically in Laplace transform domain. Three commonly used viscoelastic models are introduced to characterize the time-dependent behavior of the materials. Since the trans...

2009
M. Pasternak

The Rayleigh wave propagation problem in the elastic halfspace — viscoelastic layer interface was analysed in the paper. The problem was formulated in the Fourier–Laplace space using the Biot viscoelastic solid model. The characteristic equation has taken the Rayleigh equation form with correction term describing viscoelastic layer properties influence on the wave velocity. The approach present...

1999
Cristina E. Beldica Harry H. Hilton Seid Koric

2. INTRODUCTION Piezoelectric effects are of increasing importance in the control and sensing of structural element deflections. Elastic piezoelectric theory has been extensively developed (Leibowitz & Vinson 1993). Hilton et al. (1997) have presented an extended bibliography and discussed past contributions as well as formulated an analytical nonlinear theory of anisotropic piezoelectric-therm...

2006
Qingli Dai Martin H. Sadd Zhanping You

This study presents a finite element (FE) micromechanical modelling approach for the simulation of linear and damage-coupled viscoelastic behaviour of asphalt mixture. Asphalt mixture is a composite material of graded aggregates bound with mastic (asphalt and fine aggregates). The microstructural model of asphalt mixture incorporates an equivalent lattice network structure whereby intergranular...

2011
Boris Gurevich

Recently, Hashin-Shtrikman bounds for bulk and shear moduli of elastic composites have been extended to the moduli of composite viscoelastic media. Since viscoelastic moduli are complex, the viscoelastic bounds form a closed curve on a complex plane. We apply these general viscoelastic bounds to a particular case of a porous solid saturated with a Newtonian fluid. Our analysis shows that for po...

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