Dynamic Fracture Characterization of Al2O3 and SiCw/Al2O3

Abstract

In spite it's many favorable properties, ceramics has severe disadvantages of brittleness and poor impact resistance due to it's inherently low fracture toughness. An obvious method to improve the toughness of ceramic materials is through the use of composite techniques. The possible improved toughness due to the added ceramic whisker fibers should allow a graceful failure rather than a catastrophic failure of a ceramic component. Several mechanisms exist by which a ceramic matrix composite can exhibit superior toughness over the toughness of the matrix material. These mechanisms include crack bridging, fiber pullout, crack deflection mechanisms, microcrack shielding, and phase transformation. In crack bridging, intact whisker fibers bridge the space between the two crack faces of the matrix. Since the fibers apply a crack closure force behind the crack tip, addition energy is required to overcome this force and propagate the crack.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 1991
Accession Number
ADA242187

Entities

People

  • Albert S. Kobayashi
  • L. R. Deobald

Organizations

  • University of Washington

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Air Guns
  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Crack Propagation
  • Crack Tips
  • Cracks
  • Electron Microscopes
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Military Research
  • Modulus Of Elasticity
  • Scanning Electron Microscopes
  • Stress Intensity Factors
  • Stress Waves
  • Stresses

Fields of Study

  • Engineering
  • Materials science

Readers

  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Space