The Microscopic Origins of Toughness and Impact Resistance in Metal- Reinforced Ceramics

Abstract

It has been shown that fracture resistance in the metal-reinforced ceramics WC/Co, Al2O3/Al, and B4C/Al arises from both plasticity and crack bridging. The theoretical basis has been laid for interpreting high resolution measurements of displacement fields and crack opening profiles to deduce the proportion of toughening due to each of these mechanisms in detail. Preliminary analysis accounting for plasticity alone has been presented for data for WC/Co. Various theoretical results have been obtained concerning the inverse problem of deducing bulk plastic strain fields from surface displacement measurements and deducing bridging tractions from measured crack opening profiles. (JS)

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Document Details

Document Type
Technical Report
Publication Date
Jul 28, 1990
Accession Number
ADA228610

Entities

People

  • Brian N. Cox

Tags

DTIC Thesaurus Topics

  • Accounting
  • Ceramic Matrix Composites
  • Classification
  • Composite Materials
  • Contracts
  • Cracks
  • Displacement
  • High Resolution
  • Inverse Problems
  • Materials
  • Measurement
  • Mechanics
  • Micromechanics
  • Military Research
  • Resistance
  • Security
  • Structural Ceramics

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  • Materials Science (Mechanical Engineering).
  • Theoretical Analysis.