Characterization of Fracture in (0/90)3s SiC/1723 Composites

Abstract

The fracture behavior of 0 DEG/90 DEG sub 3s cross-plied ceramic-matrix composites is evaluated using compact tension specimens. The influence of notch preparation (abrasive water-jet or diamond saw cut) and fatigue precracking is investigated. The extent that a calculated critical stress intensity factor can be used as a fracture toughness parameter is investigated. The stress-intensity factor corresponding to the maximum load. K sub peak is found to yield consistent values for the precracked specimens. However, this parameter is found to be higher for precracked specimens than for notched specimens. This difference in K sub peak is attributed to fiber bridging of the crack in the precracked specimens. No difference in material behavior is observed between specimens with abrasive water-jet and diamond saw notch extensions. There seems to be no noticeable size effects on K sub peak for precracked specimens, in contrast with the uncracked specimens. Ceramic Matrix Composite, Fracture Toughness, Fatigue Precracking, Compact Tension, Linear Elastic Fracture Mechanics, Compliance, Crack.

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Document Details

Document Type
Technical Report
Publication Date
Mar 01, 1992
Accession Number
ADA250612

Entities

People

  • Demirkan Coker
  • Noel E. Ashbaugh

Organizations

  • University of Dayton

Tags

Communities of Interest

  • Air Platforms
  • C4I

DTIC Thesaurus Topics

  • Abrasives
  • Carbon Carbon Composites
  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Fracture (Mechanics)
  • Laminates
  • Materials
  • Materials Laboratories
  • Mechanical Properties
  • Mechanics
  • Micromechanics
  • Stress Intensity Factors
  • Stresses
  • Toughness
  • Turbines
  • Water Jets

Fields of Study

  • Materials science

Readers

  • Materials Science (Mechanical Engineering).
  • Reinforced Composite Materials