IMPROVED ELECTRON FRACTOGRAPHIC TECHNIQUES. VOLUME 2

Abstract

Improved techniques for use of the electron microscope in fractographic analysis are sought. The program is divided into 3 tasks: determination of the direction of rapid-crack propagation in metal fractures; determination of the characteristics distinguishing stress corrosion from hydrogen embrittlement; and investigation of the correlation between fatigue striation spacing and stress environment. Most of the mechanical tests for the 3 tasks were completed. The most promising technique for correlation of fracture features with direction of crack propagation was replication of the fracture surface adjacent to the edge. Consistent orientation appears between tear dimple (a dimple open to the edge) and the fracture direction near the edge. Shear dimples which are closed to the fracture edge have inconsistent correlation to fracture direction. Dimples located near the center of the fracture are either equiaxed or randomly oriented so that they show no apparent correlation to fracture direction.

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Document Details

Document Type
Technical Report
Publication Date
Jan 14, 1966
Accession Number
AD0626774

Entities

People

  • A. Phillips
  • B. V. Whiteson
  • V. Kerlins

Organizations

  • Douglas

Tags

Communities of Interest

  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Acids
  • Chemistry
  • Corrosion
  • Crack Propagation
  • Cracks
  • Data Analysis
  • Electron Microscopes
  • Heat Treatment
  • Hydrogen Embrittlement
  • Materials
  • Materials Engineering
  • Mechanical Properties
  • Orientation (Direction)
  • Statistical Analysis
  • Stress Corrosion
  • Stresses

Readers

  • Computer Vision.
  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.

Technology Areas

  • Microelectronics
  • Space