Next Generation 3D Mixed Mode Fracture Propagation Theory Including HCF-LCF Interaction (Preprint)

Abstract

The damage tolerance assessment of complex aerospace structural components requires the capability of effective modeling of 3D cracks and their associated propagation and velocity and path under fatigue loads. A 3D mixed mode crack propagation theory is presented which includes the effect of KI, KII, and KIII, as well as non-proportional loading, elastic and fracture resistance anisotropy, and fracture mode asymmetry (viz. the ability to transition between competing tensile and shear modes of propagation). A modified strain energy release rate criterion including the modeling of crack closure is developed and presented for a representative problem. An elementary, mode I characterization of closure is used, leaving shear mode closure as fertile ground for further study. Use of the model is presented for an example problem with steady-vibratory interaction.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 2010
Accession Number
ADA520088

Entities

People

  • Balkrishna Annigeri
  • Paul Wawrzynek
  • Richard G. Pettit
  • William Owen

Organizations

  • Pratt & Whitney

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Air Force Research Laboratories
  • Anisotropy
  • Asymmetry
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Demographic Cohorts
  • Failure Mode And Effect Analysis
  • Materials
  • Orientation (Direction)
  • Resistance
  • Stress Intensity Factors
  • Stresses
  • Three Dimensional
  • Transitions
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Materials Science (Mechanical Engineering).
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Space