Micromechanics of Fatigue

Abstract

Brittle and ductile isotropic damage mechanisms are studied from a meso-mechanical view point. Relationships between crack density and void volume fraction defined at meso-scale on one hand, and a scaler internal variable characterizing damage on the other hand, are given. A general form for the evolution law for this damage variable is also derived from the same approach. A threshold which defines the onset of this evolution is derived from thermodynamical considerations. The ultimate stage of this evolution, i.e., the local failure is derived from localization criteria. (JS)

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Document Details

Document Type
Technical Report
Publication Date
May 13, 1990
Accession Number
ADA229403

Entities

People

  • Jean Lemaitre
  • Rene Billardon

Tags

DTIC Thesaurus Topics

  • Classification
  • Constitutive Equations
  • Elastic Properties
  • Energy
  • Equations
  • Geometry
  • Material Degradation Processes
  • Materials
  • Mechanical Properties
  • Mechanics
  • Micromechanics
  • Nucleation
  • Personal Information Managers
  • Plastic Properties
  • Security
  • Strain Rate
  • Two Dimensional

Readers

  • Calculus or Mathematical Analysis
  • Powder metallurgy of Titanium alloys.
  • Structural Health Monitoring of Composite Structures.