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in creator/contributor: "Regueiro, Richard A. University of Colorado, Boulder, CO"

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

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 v… more

Date: January 1, 2006

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

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Modeling brittle fracture, slip weakening, and variable friction in geomaterials with an embedded strong discontinuity finite element.

Localized shear deformation plays an important role in a number of geotechnical and geological processes. Slope failures, the formation and propagation of faults, cracking in concrete dams, and shear fractures in subsiding hydrocarbon reservoirs are examples of important effects of shear localization. Traditional engineering analyses of these phenomena, such as limit equilibrium techniques, make certain assumptions on the shape of the failure surface as well as other simplifications. While thes… more

Date: October 1, 2006

Creator: Regueiro, Richard A. (University of Colorado, Boulder, CO); Borja, R. I. (Stanford University, Stanford, CA) & Foster, C. D. (Stanford University, Stanford, CA)