A viscoplastic material is rather characterized by a family of equipotential surfaces, where the pseudo-yield criterion is connected not only with the stress and the accumulated plastic strain p, but also with the rate p., i. e.

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viscoelastic viscoplastic material that also experience stiffness degradation. A general thermodynamically consistent theory of nonlinear viscoelastic and nonlinear viscoplastic materials was developed by Schapery [11] and it has been used in simulations by several authors [12,13]. In an earlier study [14] Lou and Schapery presented a constitutive The resulting constitutive behavior is that of an elasto-viscoplastic material, implemented in the implicit FE code ABAQUS. The widely-used viscoplastic selfconsistent (VPSC) formu-lation for polycrystal deformation has been implemented inside a user-deﬁned material (UMAT) subroutine, providing the relationship between stress and plastic strain-rate A finite strain viscoplastic nonlocal plasticity model is formulated and implemented numerically within a finite element framework. The model is a viscoplastic generalisation of the finite strain generalisation by Niordson and Redanz (2004) [Journal of the Mechanics and Physics of Solids 52, 2431-2454] of the strain gradient plasticity theory proposed by Fleck and Hutchinson (2001) [Journal of Abstract: The viscosity of material is considered at propagating crack-tip. Under the assumption that the artificial viscosity coefficient is in inverse proportion to the power law of the plastic strain rate, an elastic-viscoplastic asymptotic analysis is carried out for moving crack-tip fields in power-hardening materials under plane-strain condition. One day creep experiments indicated the presence of viscoplastic damage accumulation in the composite, which was verified using in-situ microscopy.

Viscoplastic material

In the introduction to the Proceedings of the “First Plasticity Symposium” in Lafayette College (1924) Bingham writes: Our discussion of plasticity therefore concerns itself with the ’flow of A viscoplastic material has a yield stress under which it will not deform, whereas a viscoelastic material will deform at any application of stress. For both types of fluids the rate of strain In book: Rheology Reviews 2007 (pp.135-178) Chapter: Flows of Viscoplastic Materials: Models and Computations; Publisher: Brit. Soc. Rheol., London, UK Viscoelastic materials are polymer substances that show both viscous and elastic properties during the deformation of the material. This property is named as viscoelasticity. Generally, viscous substances such as water resist shear flow and strain linearly with time when we apply stress.

1 Jan 2017 Rate-dependence in this context means that the deformation of the material depends on the rate at which loads are applied. The inelastic

This mechanism usually appears in polymeric materials. In viscoelasticity, the pseudo-potential ϕ ξ. v is a non-negative, closed, differentiable, convex function which vanishes at the origin. This paper investigates numerically the flow of a temperature-dependent viscoplastic fluid containing hybrid Ag and MgO nanoparticles through a ventilated heated cavity.

Materials that exhibit initial elastic behavior upon loading followed by creep and initial elastic recovery followed by continuously decreasing strain upon stress removal are termed viscoelastic (Findley et al., 1976). In short, Viscoelasticity combines elasticity and viscosity.

in the proposed model, we do not consider viscoplastic effects that can possibly emanate from the pore fluid (e.g., Borja and Choo, 2016), or other deformation mechanisms due to chemical changes in the pore fluid, which can be important for clay-rich materials. Modeling of viscoplastic deformations in soils and rocks has a This book introduces numerous selected advanced topics in viscoelastic and viscoplastic materials. The book effectively blends theoretical, numerical, modeling and experimental aspects of viscoelastic and viscoplastic materials that are usually encountered in many research areas such as chemical, mechanical and petroleum engineering. Anisotropic 1-site and 2-site self-consistent models are developed to describe the elastic-viscoplastic behavior of polycrystalline materials deformed to finite strains on the basis of rate-dependent crystallographic slip and a generalized Hill-Hutchinson self-consistent approach. The choice of rate-dependent constitutive law at single crystal level implemented in the models is discussed The material behavior of viscoelastic materials is time-dependent. The state of a viscoelastic contact is, therefore, dependent on its loading history. In the case of the normal contact problem, the sole relationship that is independent of the loading history is the contact configuration, i.e., the relationship Likewise, the low-structuring-level material ele- elastic deformation, having the effect of smoothening the stress ments that leave the vicinity of the expansion plane and advance Please cite this article in press as: F.B. Link et al., Plane flow of thixotropic elasto-viscoplastic materials through a 1:4 sudden expansion, J. Non-Newtonian Fluid Andreea Irina Barzic and Silvia Ioan (September 21st 2016).

The inelastic behavior that is the subject of viscoplasticity is plastic deformation which means that the material undergoes unrecoverable deformations when a load level is reached. Rate-dependent plasticity is important for transient plasticity calculations. Th Viscoplasticity DEFORMATIONS OF MATERIALS. JEAN LEMAITRE, in Handbook of Materials Behavior Models, 2001 Viscoplasticity refers to the Viscoplasticity Models. Viscoplasticity models are the ultimate models for polymer modeling, both in terms of accuracy Fundamental Theories and Mechanisms of Materials that exhibit initial elastic behavior upon loading followed by creep and initial elastic recovery followed by continuously decreasing strain upon stress removal are termed viscoelastic (Findley et al., 1976). In short, Viscoelasticity combines elasticity and viscosity. In contrast to fluids (chapter 9) viscoplastic materials can sustain a shear stress even at rest.
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Modeling of viscoplastic deformations in … B. Polycrystalline material B. Anisotropic material B. Elastic-viscoplastic material B. Crystal plasticity A. Microstructures abstract We present the inﬁnitesimal-strain version of a formulation based on fast Fourier trans-forms (FFT) for the prediction of micromechanical ﬁelds in polycrystals deforming in the elasto-viscoplastic (EVP) regime. @article{osti_1769509, title = {Viscoplastic Self-Consistent Formulation as Generalized Material Model for Solid Mechanics Applications}, author = {Zecevic, Miroslav and Lebensohn, Ricardo A. and Rogers, Michael and Moore, Jacob and Chiravalle, Vincent and Lieberman, Evan and Dunning, Daniel and Shipman, Galen and Knezevic, Marko and Morgan, Nathaniel}, abstractNote = {}, doi = {10.1016/j A finite element analysis of metal‐forming problems with an elastic‐viscoplastic material model.

Numerical determination of viscoplastic material parameters / Nic Gullmander. Gullmander, Nic, 1972- (författare). Lund : Solid Mechanics, Lund Institute of An Eulerian thermomechanical elastic-viscoplastic model with isotropic and directional Journal of Mechanics of Materials and Structures.
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The material models such as plasticity, creep, and viscoplasticity under Linear Elastic Materials node cannot be assigned to a material which has

Generally, viscous substances such as water resist shear flow and strain linearly with time when we apply stress. In book: Rheology Reviews 2007 (pp.135-178) Chapter: Flows of Viscoplastic Materials: Models and Computations; Publisher: Brit. Soc. Rheol., London, UK In contrast to fluids (chapter 9) viscoplastic materials can sustain a shear stress even at rest. They begin to flow with viscous stresses after a yield condition has been satisfied.