Strength and Microstructure of Ceramics

Abstract

Results of a study program on the toughness properties of monophase ceramics are summarized. In situ observations of crack propagation in alumina and other monophase ceramics show crack interface bridging to be the principal source of increasing toughness with crack size, i.e. R-curve behavior. Fracture mechanics models describing this behavior, in the particular context of strength, are developed. Results of strengths tests confirming the essential predictions of the theory are presented. Results of wear and fatigue tests are also described. The model has strong implications concerning the controlled processing of ceramics for optimum toughness and strength properties. Keywords; Strength mechanics; Fracture resistance; Brittleness; Heat treatment; Toughening; Mechanical properties.

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1989
Accession Number
ADA217752

Entities

People

  • B. J. Hockey
  • Brian R. Lawn
  • C. J. Alpert
  • C. J. Fairbanks
  • D. B. Marshall
  • Helen M. Chan
  • M. P. Harmer
  • R. F. Cook
  • S-j Cho
  • S. J. Bennison

Organizations

  • National Institute of Standards and Technology

Tags

Communities of Interest

  • Air Platforms
  • C4I
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Chemical Synthesis
  • Chemistry
  • Crystal Structure
  • Fracture (Mechanics)
  • Geometry
  • Materials
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Measurement
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Point Defects
  • Wear Resistance

Readers

  • Materials Science (Mechanical Engineering).
  • Nanocomposite Materials Science