Results 221 to 230 of about 39,549 (266)

Micro-Rheological Modelling

1995
All the complexity of the rheological behaviour of polymeric materials is ultimately rooted in their molecular structure or, in the case of suspensions, blends, block copolymers, or other complex materials, is due to the “structure” of the material at the scale of, say, 1 µm. Thus a valuable alternative to the classical approach to rheology, originally
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Rheological and Circuital Models

1994
The analysis of mechanical constitutive properties of materials, namely rheology, proceeds through the construction of ideal bodies, named rheological models. These are obtained by means of combinations in series and in parallel of elementary models, which represent the main mechanical properties: elasticity, viscosity, plasticity, strength.
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Rheological models for cement pastes

Materials and Structures, 1988
Shear stress and shear rate data obtained for cement pastes were correlated by means of different rheological models. Pastes were prepared from a commercial Portland cement 325 at different water/cement ratios ranging from 0.34 to 0.42. Tests were performed at 25°C using a rotating coaxial cylinder viscometer.
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Rheological models containing fractional derivatives

Rheologica Acta, 1970
In this contribution some aspects of rheological models containing fractional derivatives are shown. After a short historical review of the application of fractional derivatives in rheology, a mathematical formulation of these derivatives is given.
W. Smit, H. de Vries
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Rheological Modelling of Asphalt Viscoelasticity

2020
The rheology of asphalt binders is an important factor in the design and construction of roads. As polymer modification is now often required to meet performance demands, the rheological behaviour of the binders has become increasingly complex. Within the past decade, a new method to evaluate these binders and their viscoelasticity has emerged – the ...
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Rheological Models; Differential Representation

1986
The behavior of viscoelastic materials under uniaxial loading may be represented by means of conceptual models composed by elastic and viscous elements. These models are particularly useful from a didactic point of view. As analogs for stress and strain we use the total extending force and the total extension.
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Rheological Model Studies in Clay

Clays and Clay Minerals, 1969
AbstractThe process of deformation in clays is visualized as the combination of recoverable deformation resulting from bending and rotation of individual particles and irrecoverable deformation due to relative movement between adjacent particles at their points of contact.
R. W. Christensen, J. S. Kim
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Rheological model incorporating gap element

Materials and Structures, 2018
Viscoelastic materials undergo creep due to elasticity and viscosity, two intrinsic material characteristics, and a representative rheological model can be constructed for creep behavior analysis. Based on the viscoelasticity theory, this model simulates creep by formalizing elastic and viscous deformations in spring and dash-pot elements, respectively.
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Viscoelastic Contact/Impact Rheological Models

2016
The first part of this chapter is dedicated to the analysis of viscoelastic and viscoelasto-plastic rheological contact models (linear and nonlinear parallel spring-dashpot assemblies). The linear spring-dashpot model is studied, and a detailed survey of nonlinear models (like Simon-Hunt-Crossley model and its many variations) as well as other types of
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The biofilm life cycle: expanding the conceptual model of biofilm formation

Nature Reviews Microbiology, 2022
Karin Sauer, Paul Stoodley, Darla M Goeres   +2 more
exaly