# THERMODYNAMICS OF SOME VISCOPLASTIC MATERIAL MODELS WITH INTERNAL VARIABLES. De Gruyter. DOI: https://doi.org/10.1515/JMBM.1993.4.

To describe viscoplastic materials with different behavior in tension and compression PTFE (Polytetrafluorethylen), an endochronic viscoplastic material model.

44 These methods were initially developed for linear elastic composites based on Eshelby's solution A set of constitutive equations has been formulated to represent elastic-viscoplastic strain-hardening material behavior for large deformations and arbitrary loading histories. An essential feature of the formulation is that the total deformation rate is considered to be separable into elastic and inelastic components which are functions of state variables at all stages of loading and unloading. Research Portal. Find researchers, research outputs (e.g. publications), projects, infrastructures and units at Lund University Embedded three-dimensional (EMB3D) printing is an emerging technique that enables free-form fabrication of complex architectures. In this approach, a nozzle is translated omnidirectionally within a soft matrix that surrounds and supports the patterned material.

As observed from high-speed cameras, the viscoplastic material such as Carbopol moves as a long and thin train of material along the slope, and only a fraction of the sliding mass is engaged in generating the leading wave. 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 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 This decision was made in order to maximize the speed of the FE simulations. For these material models you need to specifically tell PolyUMod that you would like to also get the viscoplastic strain magnitude. You can do this by specifying that the PolyUMod global parameter 15 (called FAILT) has a value of 16.

## Viscoplasticity refers to the mechanical response of solids involving time-dependent, irreversible (inelastic) strains. The deformation of essentially all metals is, to a certain extent, time-dependent. This dependence, however, becomes more pronounced at temperatures exceeding a third of thematerial's melting point.

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.

### Unified theories of elastic-viscoplastic material behavior, which are primarily applicable for metals and metallic alloys, combine all aspects of inelastic response

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The isotropic hardening curves for viscoplastic materials are stored in the two-dimensional integer field nplicon and the three-dimensional real field plicon. The entry nplicon(0,i) contains the number of temperature data points for the isotropic hardening definition of material i, whereas nplicon(j,i) contains the number of stress-strain data points at temperature point j of material i. 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.

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Therefore, the mechanical behavior of the ingot is described by an elastic-viscoplastic material model. Fjær and Mo (1990) presented a DC Constitutive Equation Viscoplastic Material Viscoplastic Behavior Nonlinear Constitutive Equation VOCE Equation These keywords were added by machine and not by the authors.

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Viscoelastic and Viscoplastic Materials. Mohamed El-Amin.

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formulation in terms of the structure parameter, viscoelastic stress, where g0 is the viscosity of the material in its fully structured state. pressure, and velocity. In many cases of real materials g0 is so large (maybe infinite) that it A Viscoplastic material has a yield stress under which it will not deform, whereas a viscoelastic material will deform at any application of stress 8. Using a combination of numerical computations and asymptotic analysis, we show that the plugs of the Viscoplastic theory actually disappear in the plastic limit, albeit very slowly.

## Time dependent creep settlements are one of the most important causes of material deteriorations for the huge water structures such as concrete faced rockfill dams (CFRDs). For this reason, performing creep analyses of CFRDs is vital important for monitoring and evaluating of the future and safety of such dams. In this study, it is observed how changes viscoplastic behaviour of a CFR dam

Thus, viscoplastic materials are considered as solids.

For this reason, examination of the time-dependent viscoplastic interaction analyses is vital important for monitoring and evaluating of the future and safety of the rockfill dams. Viscoelastic and Viscoplastic Materials. 212. rate of the 5-Hz tests was 0.075 s-1), it can be observed that values for the stresses and stiffness.