A Nanoscale Mechanism of Fatigue in Ionic Solids

Abstract

We employ periodic density functional theory to explore the effect of cyclic tensile loading on the behavior of alumina in the threshold region of crack formation. We find evidence for nanoscale fatigue when the alumina lattice is subjected to uniaxial tensile loading and unloading and tensile stresses normal to the applied load. It is possible that such atomic-scale fatigue impacts the durability of ceramics, since the highly ionic bonding requires near-ideal lattice structures in order to maintain cohesive strength.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2006
Accession Number
ADA593684

Entities

People

  • Emily A. Carter
  • Emily A. Jarvis

Organizations

  • Princeton University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Abstracts
  • Aluminum
  • Crack Tips
  • Cracks
  • Crystal Lattices
  • Density Functional Theory
  • Electron Density
  • Electrons
  • Elements
  • Materials
  • Mathematics
  • Oxidation
  • Oxides
  • Simulations
  • Standards
  • Tensile Strain
  • Unloading

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Nanocomposite Materials Science