A SEM Procedure for Quantifying Transgranular Fracture in Brittle Material

Abstract

A SEM procedure for quantifying the percentage area of transgranular fracture was developed for studying the fracture morphologies of stable and rapid crack growths in ceramics and ceramic matrix composites. The procedure utilizes SEM line scanning profiles which are scanned and then interpreted as percentage area of transgranular fracture and surface roughness through a special software. This procedure was used to quantify the percentage area of transgranular fracture and surface roughness which were correlated with the visual observations and profilometer measurements respectively, of Al2O3 and SiCw/Al2O3 fracture specimens. Dynamic fracture of quasi-brittle metals and polymers are characterized by crack velocity versus stress intensity factor (SIF) relations which represent a gamma curve with distinct crack arrest SIF's.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1990
Accession Number
ADA225211

Entities

People

  • Albert S. Kobayashi
  • C. T. Yu
  • W. J. Yang

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Cantilever Beams
  • Ceramic Matrix Composites
  • Electron Microscopes
  • Electron Microscopy
  • Electrons
  • Failure Mode And Effect Analysis
  • Fractography
  • Fracture (Mechanics)
  • Grain Size
  • Line Scanning
  • Materials
  • Materials Science
  • Measurement
  • Mechanics
  • Microscopes
  • Scanning Electron Microscopes
  • Surface Roughness

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Materials Science (Mechanical Engineering).
  • Spectroscopy.