Time-Domain Boundary Element Analysis of Dynamic Near-Tip Fields for Impact-Loaded Collinear Cracks.

Abstract

A time-domain boundary integral equation method has been developed to calculate elastodynamic fields generated by the incidence of stress (or displacement) pulses on single cracks and systems of two collinear cracks. The system of boundary integral equations has been cast in a form which is amenable to solution by the boundary element method in conjunction with a time-stepping technique. Particular attention has been devoted to dynamic overshoots of the stress intensity factors. Elastodynamic stress intensity factors for pulse incidence on a single crack have been computed as functions of time, and they have been compared with results of other authors. For collinear macrocrack-microcrack configurations the stress intensity factors at both tips of the macrocrack have been computed as functions of time for various values of the crack spacing and the relative size of the microcrack.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 1988
Accession Number
ADA192930

Entities

People

  • C. Zhang
  • Jan D. Achenbach

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Boundaries
  • Boundary Element Methods
  • Crack Tips
  • Cracks
  • Displacement
  • Elastic Waves
  • Equations
  • Integral Equations
  • Integral Transforms
  • Integrals
  • Intensity
  • Military Research
  • Security
  • Stress Intensity Factors
  • Time Domain
  • Two Dimensional
  • Waves

Readers

  • Combustion Dynamics and Shock Wave Physics.
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Materials Science (Mechanical Engineering).

Technology Areas

  • Space