On the formulation, parameter identification and numerical integration of the EMMI model :plasticity and isotropic damage.

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In this report we present the formulation of the physically-based Evolving Microstructural Model of Inelasticity (EMMI) . The specific version of the model treated here describes the plasticity and isotropic damage of metals as being currently applied to model the ductile failure process in structural components of the W80 program . The formulation of the EMMI constitutive equations is framed in the context of the large deformation kinematics of solids and the thermodynamics of internal state variables . This formulation is focused first on developing the plasticity equations in both the relaxed (unloaded) and current configurations. The equations in the ... continued below

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94 p.

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Bammann, Douglas J.; Johnson, G. C. (University of California, Berkeley, CA); Marin, Esteban B. & Regueiro, Richard A. (University of Colorado, Boulder, CO) January 1, 2006.

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Description

In this report we present the formulation of the physically-based Evolving Microstructural Model of Inelasticity (EMMI) . The specific version of the model treated here describes the plasticity and isotropic damage of metals as being currently applied to model the ductile failure process in structural components of the W80 program . The formulation of the EMMI constitutive equations is framed in the context of the large deformation kinematics of solids and the thermodynamics of internal state variables . This formulation is focused first on developing the plasticity equations in both the relaxed (unloaded) and current configurations. The equations in the current configuration, expressed in non-dimensional form, are used to devise the identification procedure for the plasticity parameters. The model is then extended to include a porosity-based isotropic damage state variable to describe the progressive deterioration of the strength and mechanical properties of metals induced by deformation . The numerical treatment of these coupled plasticity-damage constitutive equations is explained in detail. A number of examples are solved to validate the numerical implementation of the model.

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94 p.

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  • Report No.: SAND2006-0200
  • Grant Number: AC04-94AL85000
  • DOI: 10.2172/883488 | External Link
  • Office of Scientific & Technical Information Report Number: 883488
  • Archival Resource Key: ark:/67531/metadc875813

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  • January 1, 2006

Added to The UNT Digital Library

  • Sept. 21, 2016, 2:29 a.m.

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  • Nov. 30, 2016, 2:42 p.m.

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Bammann, Douglas J.; Johnson, G. C. (University of California, Berkeley, CA); Marin, Esteban B. & Regueiro, Richard A. (University of Colorado, Boulder, CO). On the formulation, parameter identification and numerical integration of the EMMI model :plasticity and isotropic damage., report, January 1, 2006; United States. (digital.library.unt.edu/ark:/67531/metadc875813/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.