Probabilistic Simulation of Fatigue Crack Initiation

Abstract

Many fatigue-related studies have been conducted on the workhorse alloys for airframe construction over the past 20-30 years. The body of empirical knowledge related to establishing relationships between loading conditions and fatigue life or fatigue crack growth rates, including environmental effects is vast. One consistent observation is that the number of cycles it takes to initiate a fatigue crack (imitation life) in high strength aluminum alloys, like AA 7075, is a significant fraction of total life. Fundamental understanding of what causes fatigue cracks to initiate is elusive, however, and current alloy and airframe component design methodologies remain highly empirical processes.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2001
Accession Number
ADA425231

Entities

People

  • Anthony Ingraffea

Organizations

  • Cornell University

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Computational Science
  • Crystal Structure
  • Crystals
  • Differential Equations
  • Elastic Properties
  • Finite Element Analysis
  • Fokker Planck Equations
  • Geometry
  • Grain Boundaries
  • Grain Size
  • Materials
  • Mechanical Properties
  • Probabilistic Models
  • Probability
  • Scattering
  • Simulations
  • Three Dimensional

Readers

  • Educational Psychology
  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.