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Showing 1 to 14 of 14 for “"Nonlinear Viscoelasticity"”.
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Mechanics of living cells: nonlinear viscoelasticity of single fibroblasts and shape instabilities in axons
… in fibroblasts bears a strong resemblance to the nonlinear mechanics of Euler-Bernoulli beams, which also show a linear regime at low forces and a crossover to power-law stiffening. Systematic analysis of the response of fibroblasts to large amplitude deformations reveals a striking similarity to …
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A finite element analysis of adhesively bonded composite joints including geometric nonlinearity, nonlinear viscoelasticity, moisture diffusion and delayed failure
… The adhesive layer is modeled using Schapery's nonlinear single integral constitutive law for uniaxial and multiaxial states of stress. Effect of temperature and stress level on the viscoelastic response is taken into account by a nonlinear shift factor definition. Penetrant sorption is …
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Nonlinear viscoelastic materials : bioinspired applications and new characterization measures
… experience mechanical loading which evokes a nonlinear rheological response. Rheologically complex materials can provide novel functionality in biological and engineered systems. However, it is found that standard characterization techniques are insufficient to appropriately describe nonlinear …
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Compacted Snow Testing Methodology and Instrumentation
… high compressibility and temperature-sensitive nonlinear viscoelasticity. Snow mechanics has been intensively investigated by avalanche and army researchers for decades. However, fewer research studies have been published for compacted snow, commonly defined as snow with a density in the range …
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Modeling viscoelastic cellular materials for the pressing of wood composites
… of cellular materials in conjunction with linear viscoelasticity of polymers to develop a nonlinear viscoelasticity model for wood in transverse compression. The approach couples the viscoelastic behavior of the amorphous polymers in wood with the structure imposed by anatomy. These theories, if …
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Theory of slow coupled translational-rotational dynamics and viscoelasticity of nonspherical particle suspensions
… theory (NMCT) for ideal kinetic arrest and the nonlinear Langevin equation (NLE) theory of activated single-particle barrier hopping dynamics are generalized to describe coupled center-of-mass (CM) translational and rotational motions of uniaxial particles within the interaction site formalism. …
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Asymptotically nonliner oscillatory shear: theory, modeling, measurements and applications of nonlinear elasticity to stimuli-responsive composites
… of synthetic and biological polymers, exhibit a nonlinear rheological response to mechanical deformation. Oscillatory shear is a popular deformation protocol for viscoelastic characterization, both linear and nonlinear, the latter referred to as large amplitude oscillatory shear (LAOS). However, …
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Exponential Stability for a Diffusion Equation in Polymer Kinetic Theory
In this paper we present an exponential stability result for a diffusion equation arising from dumbbell models for polymer flow. Using the methods of semigroup theory, we show that the semigroup U(t) associated with the diffusion equation is well defined and that all solutions converge …
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Oscillatory shear in strain and stress: reduced metrics, first measurements, and linearity limits
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Nonlinear Viscoelastic Behavior of Ligaments and Tendons: Models and Experiments
… level thus suggesting that the fascicles are nonlinear viscoelastic. A constitutive model was then formulated within the nonlinear integral representation frame- work proposed by Pipkin and Rogers (1968). Unlike the well-known quasi-linear viscoelastic model, the proposed constitutive law was …
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Rheologische und morphologische Charakterisierung von DBS-Netzwerkstrukturen in unterschiedlichen Polymermatrizes
Ziel der Dissertation war es, die Strukturbildung des niedermolekularen Gelbildners Dibenzylidensorbitol (DBS) in unterschiedlichen Polymermatrizes systematisch zu untersuchen, um daraus grundlegende Beziehungen zwischen den auftretenden Polymer-Gelbildner-Wechselwirkungen und den resultierenden …
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Nonlinear Viscoelastic Wave Propagation in Brain Tissue
… been developed. The assumption of quasi-linear viscoelasticity (QLV) was validated for strain levels of up to 35%. A generalized Rivlin model was used for the isochoric part of the deformation and it was shown that at least three terms (C_10, C_01 and C_11) are needed to accurately capture the …
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Linear and Nonlinear Viscoelastic Characterization of Proton Exchange Membranes and Stress Modeling for Fuel Cell Applications
… and accurately modeling the linear and nonlinear viscoelastic constitutive properties of a PEM are important for making hygrothermal stress predictions in the cyclic temperature and humidity environment of operating fuel cells. In this study, Nafion® NRE 211, Gore-Select® 57, and Ion …