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

Abstract

Activity centered on the development and implementation of robust methods for measuring crack opening in the samples studied with X-ray Tomographic Microscopy (XTM). The existing XTM data of notched tensile (NT) samples consists of a three-dimensional stack of several hundred two-dimensional slices, each containing between 400x400 and 600x600 pixels. Analysis of the three-dimensional crack wandering through this volume in done in several steps. The first step is to determine the separation between crack faces using cuts perpendicular to the stack of slices. Separation will be measured as a function of position for the different applied loads. Cuts parallel to the load axis are expected to give a more precise measure of crack opening than measurements within planes parallel to the slices, especially when the openings are on the order of one or two pixels in size.

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Document Details

Document Type
Technical Report
Publication Date
Oct 08, 1991
Accession Number
ADA256587

Entities

People

  • Stephen D. Antolovich
  • Stuart R. Stock

Organizations

  • Georgia Tech

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Composite Materials
  • Crack Propagation
  • Crack Tips
  • Engineering
  • Fracture (Mechanics)
  • Materials
  • Materials Engineering
  • Materials Science
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Metal Matrix Composites
  • Stress Intensity Factors
  • Three Dimensional
  • Tomography
  • X Rays
  • X-Ray Computed Tomography

Readers

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