Topic
Viscoelasticity
About: Viscoelasticity is a research topic. Over the lifetime, 26605 publications have been published within this topic receiving 599038 citations.
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TL;DR: This work defines a robust and physically meaningful scheme to quantify materials which exhibit both viscous and elastic nonlinearities simultaneously, using an imposed large amplitude oscillatory shear (LAOS) strain.
Abstract: Characterizing purely viscous or purely elastic rheological nonlinearities is straightforward using rheometric tests such as steady shear or step strains. However, a definitive framework does not exist to characterize materials which exhibit both viscous and elastic nonlinearities simultaneously. We define a robust and physically meaningful scheme to quantify such behavior, using an imposed large amplitude oscillatory shear (LAOS) strain. Our new framework includes new material measures and clearly defined terminology such as intra-/intercycle nonlinearities, strain-stiffening/softening, and shear-thinning/thickening. The method naturally lends a physical interpretation to the higher Fourier coefficients that are commonly reported to describe the nonlinear stress response. These nonlinear viscoelastic properties can be used to provide a “rheological fingerprint” in a Pipkin diagram that characterizes the material response as a function of both imposed frequency and strain amplitude. We illustrate our new ...
784 citations
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TL;DR: In this article, it was shown that the solutions of (1.1) are asymptotically stable provided that g(T) is a nonnegative, monotonic non-increasing and convex function such that
Abstract: where p, c are positive constants and g(r is independent of x; u(x, t) has been assigned on [0, 1 ] x ( oo, 0]. In a recent paper [1] the author investigated the problem of asymptotic stability for a class of abstract integrodifferential equations in function space, and the results were then applied to viscoelasticity. It was established, for instance, that the solutions of (1.1) are asymptotically stable provided that g(T) is a nonnegative, monotonic non-increasing and convex function such that
763 citations
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TL;DR: The viscoelastic properties of the cytoplasm of J774 macrophages are measured with a recently developed microrheometer and the magnetophoretic motion of the ferromagnetic beads at a constant magnetic force is analyzed, suggesting that the cy toplasm is composed of clusters of densely packed and cross-linked filaments separated by soft regions.
760 citations
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TL;DR: The molecular constitution of viscoelastic gels is customarily described in terms of networks, which may have a transient or permanent character as discussed by the authors, depending on the ionic strength of the solution, these particles may be completely stiff or semiflexible.
Abstract: The molecular constitution of viscoelastic gels is customarily described in terms of networks, which may have a transient or permanent character. Such supermolecular structures are often observed in biological or macromolecular systems, but can even occur in dilute solutions of some detergents. Surfactant molecules in solution, under suitable conditions, assemble reversibly into large aggregates of rod-like geometry. Depending on the ionic strength of the solution, these particles may be completely stiff or semiflexible. At low concentrations, when the lengths of the rods are much smaller than their mean distance of separation, there exists a sol state which is highly sensitive to shear forces. At higher surfactant concentrations, where the lengths of the rod shaped micelles become comparable to their mean distance, one observes gel formation and the solutions exhibit pronounced elastic properties. In analogy to polymer systems, these elongated, rod shaped micelles are strongly entangled; this leads to co...
745 citations
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729 citations