A micro-damage model for high velocity impact using combined viscosity and gradient localization limiters

Rashid K. Abu Al-Rub, George Z. Voyiadjis, Anthony N. Palazotto

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations

Abstract

During dynamic loading processes, large inelastic deformation associated with high strain rates leads, for a broad class of ductile metals, to degradation and failure by strain localization. However, as soon as material failure dominates a deformation process, the material increasingly displays strain softening and the finite element computations are considerably affected by the mesh size and alignment. This gives rise to a non-physical description of the localized regions. This paper presents theoretical and computational frameworks to solve this problem with the aid of nonlocal gradient-enhanced theory coupled to visco-inelasticity. Constitutive equations for anisotropic thermo-viscodamage (rate-dependent damage) mechanism coupled with thermo-hypoelasto-viscoplastic deformation are developed in this work within the framework of thermodynamic laws, nonlinear continuum mechanics, and nonlocal continua. Explicit and implicit micro-structural length scale measures, which preserve the well-posedness of the differential equations, are introduced through the use of the viscosity and gradient localization limiters.

Original languageBritish English
Title of host publicationProceedings of the ASME Applied Mechanics Division 2005
Pages123-130
Number of pages8
DOIs
StatePublished - 2005
Event2005 ASME International Mechanical Engineering Congress and Exposition, IMECE 2005 - Orlando, FL, United States
Duration: 5 Nov 200511 Nov 2005

Publication series

NameAmerican Society of Mechanical Engineers, Applied Mechanics Division, AMD
Volume256
ISSN (Print)0160-8835

Conference

Conference2005 ASME International Mechanical Engineering Congress and Exposition, IMECE 2005
Country/TerritoryUnited States
CityOrlando, FL
Period5/11/0511/11/05

Keywords

  • Localization
  • Material Length Scale
  • Nonlocal Theory
  • Size Effects

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