Results 241 to 250 of about 462,318 (290)

Viscoelastic relaxation in supercooled liquids

Discussions of the Faraday Society, 1967
A study has been made of the viscoelastic behaviour of a range of supercooled liquids each of which has a steady-flow viscosity η fitting the equation, ln η=A′+ B′/(T–T0), where T0 is the reference temperature at which no free-volume is available for molecular translational motion. For all the liquids investigated, the limiting shear rigidity modulus G∞
A. J. Barlow, J. Lamb
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Viscoelastic relaxation of polydimethylsiloxane liquids

Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1964
Abstract The shear mechanical impedance of six polydimethylsiloxane liquids of viscosity grades ranging from 100 to 100000 cS has been measured over the frequency range 10 kc/s to 78 Mc/s, and at temperatures from –50 to +50 °C. It was found possible to reduce the experimental data for each liquid to give a single curve for each ...
A. J. Barlow, G. Harrison, J. Lamb
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Relaxation in elastic and viscoelastic materials

Journal of Materials Science, 1984
The mechanical compliance and modulus retardation/relaxation functions are examined in terms of a general behaviour which contains more than one process. An analytical approach to the transformation in the anelastic response between the compliance and the modulus is derived and applied to a cooperative model of relaxation behaviour. In particular it is
Robert M. Hill, Leonard A. Dissado
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Prevention of Stress Relaxation in Viscoelastic Structures

Journal of Structural Engineering, 1992
This paper presents a new problem in linear viscoelastic structural analysis. Homogeneous structures with rigid restraints, where stress relaxation is prevented at a time after loading, are studied. This restriction produces time-dependent increments in the initial displacements.
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Stress Relaxation of Viscoelastic Material

Transactions of the Society of Rheology, 1974
The stress relaxation of viscoelastic material after cessation of steady-state flow has been investigated. A method is proposed that allows fairly accurate prediction of the shear stress component, P12(t), as well as the first normal stress component, P11–P22(t), for a relatively wide range of time and shear rates.
B. Hlaváček, J. F. Stanislav, F. A. Seyer   +2 more
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The Relaxed Work Functional in Linear Viscoelasticity

Mathematics and Mechanics of Solids, 2004
The relaxed work from a history H' to a history H is defined as the minimum work required to approach H via a sequence of continuations of H'. I prove three basic properties of the relaxed work: subadditivity, lower semicontinuity with respect to H for fixed H', and two dissipation inequalities.
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The Creep and Relaxation of Viscoelastic Polymer

Advanced Materials Research, 2011
Polymers have more complicated properties since they display both elastic and viscous type responses at different strain rates. As the application of polymers increase, a thorough understanding of the mechanical behavior of these materials becomes vital in order to perform innovative and economical designs of various components.
Ga Ping Wang, Yang Bai, Li Chen
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Viscoelastic relaxation in supercooled eugenol

Journal of the Chemical Society, Faraday Transactions 2, 1975
Measurements have been made of the viscosity, density, and shear mechanical resistance of eugenol. The relaxational behaviour is described in terms of the complex shear compliance J*(jω)=J∞+ 1/jωη+Jr/(1 + jωτr)β with the parameters Jr/J∞= 1.0, ηJ∞/τr= 2.0 and β= 0.5.
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Viscoelastic relaxation in liquid mixtures

Proceedings of the Royal Society of London. A. Mathematical and Physical Sciences, 1969
Abstract The authors have previously described a model from which the viscoelastic relaxation of supercooled liquids in alternating shear can be predicted. According to this model, the complex compliance of the liquid is represented by the equation J* = 1/G∞[1+1/jωr +2/(jωr)4], where G∞ is the limiting high frequency shear modulus and
A. J. Barlow, A. Erginsav, J. Lamb
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Stress relaxation test for the characterization of the viscoelasticity of pellets

European Journal of Pharmaceutics and Biopharmaceutics, 2007
The characterization of the mechanical properties of single uncoated pellets was performed in order to verify if these parameters could be used to predict the pellets aptitude to be compressed or utilized differently. Different ratios of microcrystalline cellulose and lactose monohydrate were used for the preparation of four batches of pellets by an ...
CESPI, MARCO, BONACUCINA, Giulia, MISICI FALZI M, GOLZI R, BOLTRI L, PALMIERI, Giovanni Filippo   +5 more
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