Multiscale Modeling of Metallic Microstructures: From Dislocations to Plasticity

Abstract

The goal of this research program has been to establish a quantitative link between important strengthening mechanisms and the observed stress-strain behavior of complex, metallic aerospace materials via a modeling strategy involving mesoscale dislocation dynamics (DD) simulations and spatial homogenization. In addition, we have sought to understand better the role of cracks and grain boundaries in determining mechanical behavior, and the impact of obstacles on the formation of dislocation substructures. Substantial progress has been made towards these ends by further developing the DD methodology, by elucidating the interactions among dislocations, solute, and extended defects, and by characterizing dislocation patterning resulting from interactions with obstacles. We summarize below the main results obtained under the auspices of this grant.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2009
Accession Number
ADA513652

Entities

People

  • David J Srolovitz
  • Jeffrey M. Rickman
  • Mikko P. Haataja
  • Richard A. Lesar

Organizations

  • Lehigh University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Human Systems

DTIC Thesaurus Topics

  • Boundaries
  • Computer Simulations
  • Dynamics
  • Engineering
  • Grain Boundaries
  • Materials
  • Materials Engineering
  • Materials Science
  • Mechanical Properties
  • Microstructure
  • Multiscale Modeling
  • Physics
  • Plastic Properties
  • Simulations
  • Stresses

Readers

  • Ocean-Atmosphere Mesoscale Modeling, Data Assimilation, and Flux Boundary Layers
  • Powder metallurgy of Titanium alloys.
  • Systems Analysis and Design

Technology Areas

  • Space