Advanced Modeling for Fatigue Growth of Small Surface Cracks

Abstract

The primary result of the sponsored research is the development and application of the boundary element method for two- and three-dimensional fatigue crack growth analysis. The two-dimensional formulation developed previously (AFOSR Contract No. F49620-84-C-0042) was extended to investigate the crack tip behavior of long and short cracks under cyclic loading. The influence of residual plasticity on stress intensity factor was used to obtain an unambiguous estimate of the plastic zone size. It was demonstrated that the effect of the plastic wake on the stress intensity factor for crack opening (closure) and the effect of the residual stress on the retardation are identical manifestations of the same plasticity process. The boundary integral equations also provide insight to the mathematical equivalence of these two effects. Keywords: Fracture mechanics, Fatigue crack growth, Crack retardation, Crack closure, Crack opening displacement, Boundary element method.

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Document Details

Document Type
Technical Report
Publication Date
May 31, 1988
Accession Number
ADA198077

Entities

People

  • S. T. Raveendra
  • T. A. Cruse

Organizations

  • Southwest Research Institute

Tags

DTIC Thesaurus Topics

  • Air Force
  • Boundary Element Methods
  • Computational Fluid Dynamics
  • Computational Science
  • Crack Propagation
  • Crack Tips
  • Equations
  • Finite Element Analysis
  • Fluid Mechanics
  • Fracture (Mechanics)
  • Geometry
  • Integral Equations
  • Mechanics
  • Plastic Properties
  • Residual Stress
  • Three Dimensional
  • Two Dimensional

Fields of Study

  • Engineering

Readers

  • Materials Science (Mechanical Engineering).
  • Theoretical Analysis.