A Study of the Relationship Between Macroscopic Measures and Physical Processes Occurring During Crack Closure.

Abstract

This report is divided into Parts A and B which cover the numerical modeling with supporting fractography and the high resolution x-ray computed tomography of loaded samples, respectively. The figures for each part immediately follow the text of that part. The focus throughout is to relate macroscopic measures of crack closure to the physical-processes occurring at and near the crack tip. The most significant accomplishments of the program detailed in Part A include the following. Roughness-induced crack closure was characterized by fractographic analysis. The crack tip stress parameter, K, was justified as a forcing function at the crack tip in the roughness-induced crack closure problem. Analytical models were developed to predict the closure stress intensity factor as a function of crack length using a "phenomenological approach." The relations between fractographically measured parameters and the crack driving "force" was investigated. (MM)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1995
Accession Number
ADA299589

Entities

People

  • Stephen D. Antolovich
  • Stuart R. Stock

Organizations

  • Georgia Tech

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Crack Propagation
  • Crack Tips
  • Cracks
  • Experimental Data
  • Geometry
  • Grain Boundaries
  • High Resolution
  • Materials
  • Measurement
  • Mechanical Properties
  • Roughness
  • Stress Intensity Factors
  • Three Dimensional
  • Tomography
  • Two Dimensional
  • X Rays
  • X-Ray Computed Tomography

Readers

  • Business Analytics
  • Computational Modeling and Simulation
  • Materials Science (Mechanical Engineering).