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Wednesday, July 22, 2020 | History

3 edition of A hydrostatic stress-dependent anisotropic model of viscoplasticity found in the catalog.

A hydrostatic stress-dependent anisotropic model of viscoplasticity

A hydrostatic stress-dependent anisotropic model of viscoplasticity

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Published by National Aeronautics and Space Administration, National Technical Information Service, distributor in [Washington, DC], [Springfield, Va .
Written in English

    Subjects:
  • Metallic composites.,
  • Viscoplasticity.

  • Edition Notes

    Other titlesHydrostatic stress dependent anisotropic model of viscoplasticity.
    StatementD.N. Robinson and Q. Tao and M.J. Verrilli.
    SeriesNASA technical memorandum -- 106525.
    ContributionsTao, Q., Verrilli, Michael J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL18067719M

    The direction of the viscoplastic strain rate is determined by equation (5). Because the potential function gin equation (5) generally differs from the rate-dependent yield function, equation (11), the viscoplastic model can be characterized as ‘non-associated’. 3. Comparison of the Perzyna model and the Consistency model VISCOPLASTICITY AND DAMAGE MECHANICS MODELS FOR RATE-DEPENDENT MATERIALS AND THEIR APPLICATION TO ICE by Dong Ho Choi B.S., Civil Engineering, Hanyang University () The objective of this work is to develop a physically-based constitutive model for rate-dependent materials based on the underlying deformation .

    A Theory of Viscoplasticity without a Yield Surface. Part 1. General Theory [K. C. Valanis] on *FREE* shipping on qualifying offers. A Theory of Viscoplasticity without a Yield Surface. Part 1. General TheoryAuthor: K. C. Valanis. Mechanical Behaviour of Materials: Volume II: Viscoplasticity, Damage, Fracture and Contact Mechanics (Solid Mechanics and Its Applications) [François, Dominique, Pineau, André, Zaoui, André] on *FREE* shipping on qualifying offers. Mechanical Behaviour of Materials: Volume II: Viscoplasticity, Damage, Fracture and Contact Mechanics (Solid Format: Hardcover.

    a general, three-dimensional model based on the SOM nonlinear homogenization method of Ponte Castañeda (a) to estimate accurately the effective behavior of anisotropic viscoplastic porous solids subjected to finite deformations. One of the main issues in this study is the improvement of this new model relative to the. Features of the behavior of a solid rubber: 1. The material is close to ideally elastic. i.e. (i) when deformed at constant temperature or adiabatically, stress is a function only of current strain and independent of history or rate of loading, (ii) the behavior is reversible: no net work is done on the solid when subjected to a closed cycle of strain under adiabatic or isothermal conditions.


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A hydrostatic stress-dependent anisotropic model of viscoplasticity Download PDF EPUB FB2

A hydrostatic stress-dependent, anisotropic model of viscoplasticity is formulated as an extension of Bodner's model. This represents a further extension of the isotropic Bodner model over that made to. A hydrostatic stress-dependent, anisotropic model of viscoplasticity is formulated as an extension of Bodner's model.

This represents a further extension of the isotropic Bodner model over that. Get this from a library. A hydrostatic stress-dependent anisotropic model of viscoplasticity. [D N Robinson; Q Tao; Michael J Verrilli; United States. National Aeronautics and.

A hydrostatic stress-dependent, anisotropic model of viscoplasticity is formulated as an extension of Bodner's model. This represents a further extension of the isotropic Bodner model over that made to anisotropy by Robinson and MitiKavuma.

Account is made of the inelastic deformation that can occur in metallic composites under hydrostatic : Q. Tao, D. Robinson and M. Verrilli. For this end, an anisotropic viscodamage-viscoplasticity model for rock is developed.

In the viscodamage part of the model, the Rankine criterion indicates the tensile stress states leading to rate-dependent anisotropic : Timo Saksala. The novel visco-hypoplasticity model presented in the paper is based on an anisotropic preconsolidation surface.

It can distin- guish between the undrained strength upon triaxial vertical loading and horizontal loading. The strain-induced anisot- ropy is described using a second-order structure tensor.

For developing a viscoplasticity model based on the concept of overstress (Perzyna, ), a static yield function that becomes a base for time-independent plasticity is required to define the effective overstress which determines the magnitude of viscoplastic strain the present purpose, the static yield function should meet the condition that it can describe the plastic flow.

Plastic anisotropy effects may be described in a phenomenological model by employing in the constitutive theory a set of internal variables, which are defined suitably. These variables have to model the hardening response of the material under consideration to describe e.g.

the rotation of some symmetry axes. Such axes are imagined to be related with the development of the. Viscoplasticity is a theory in continuum mechanics that describes the rate-dependent inelastic behavior of solids.

Rate-dependence in this context means that the deformation of the material depends on the rate at which loads are applied. 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. Viscoplasticity differs from this in apparently mainly two points: the limit load is rate-dependent ([1] (p. )) the flow rate above the limit load is also rate dependent ([2] (p.

)) As I said, metal continuum mechanics is not my field, so for more information I will advise you to read e.g. those books. It is the objective of this paper to further exploit thermodynamically-guided dynamic coarse-graining, by deriving a constitutive law for the plastic velocity gradient from a generalized fluctuation–dissipation relation, thereby modeling anisotropic elasto-viscoplasticity without relying on classical yield criteria or the associated flow by: 2.

1 NON-LOCAL COUPLING OF VISCOPLASTICITY AND ANISOTROPIC VISCODAMAGE FOR IMPACT PROBLEMS USING THE GRADIENT THEORY George Z. Voyiadjis* and Rashid K. Abu Al-Rub Department of Civil and Environmental Engineering, Louisiana State University, Baton Rouge, LAUSA Anthony N. Palazotto. Critical stresses estimation by crystal viscoplasticity modeling of rate-dependent anisotropy of Al-rich TiAl alloys at high temperature.

Abstract. Determining critical stresses for different slip systems is one of the most important parts in crystal plasticity modeling of by: 1. The model is capable to describe the main features of the time-dependent behaviour of rocks such as strain hardening, stress-dependent creep, moisture effects, damage-induced anisotropy and failure.

Viscoplasticity [microform]: a thermodynamic formulation / A.D. Freed and J.L. Chaboche; Formulation of the nonlinear analysis of shell-like structures, subjected to time-dependent mechanical a A hydrostatic stress-dependent anisotropic model of viscoplasticity [microform] / D.N.

Robinson and Q. Elastic anisotropy with isotropic viscoplasticity. This model describes small deformations for elastically anisotropic materials with a von Mises type yield surface.

Often, this model is used as a compromise for anisotropic materials with lack of data or detailed knowledge about the anisotropic behavior in the viscoplastic range.

Peridynamics is a continuum reformulation of the standard theory of solid mechanics. Unlike the partial differential equations of the standard theory, the basic equations of. recent books by Simo and Hughes [1], and Belytschko et al.

[2] can be consulted for the review and as- The stress dependent term in Eq. (9) therefore becomes Using a viscoplasticity model based on the concept of overstress [9–12], with anisotropic hardening ac-counted for via the back stress a, we may write.

Viscoplasticity model at finite deformations with combined isotropic and kinematic hardening Adnan Ibrahimbegovi c a,*, Lotfi Chorfi b,1 a Ecole Normale Sup erieure de Cachan=LMT, 61 av.

du President Wilson, Cachan Cedex, France b Universit e de Technologie de Compi gne, Dept. GSM, bp, Compi gne Cedex, France Received 25 February.

Isotropic elasticity, orthotropic elasticity (requires anisotropic yield), or the combination of an equation of state and isotropic linear elastic shear behavior for an equation of state (in ABAQUS/Explicit) Rate-dependent viscoplasticity *RATE DEPENDENT: Drucker-Prager plasticity, crushable foam plasticity, or metal plasticity.

Viscoplastic Finite Element Analysis of Complex Geotechnical Problems Tresca material, predicted by the elasto/viscoplasticity approach agrees very well with that obtained by Prandtl exact solution (only 1% above Prandtl exact solution).

second category is the hydrostatic stress dependent surfaces, such as Mohr-Coulomb and Drucker Cited by: 5.The full text of this article hosted at is unavailable due to technical difficulties.The tensile failure model uses the hydrostatic pressure stress as a failure measure to model dynamic spall or a pressure cutoff and offers a number of failure choices including element removal.

Similar to the Johnson-Cook shear failure model, the ABAQUS/Explicit tensile failure model is suitable for high-strain-rate deformation of metals and is.