Fiber Matrix Interface Effects in Failure of Ceramic Matrix Fiber Composites

Abstract

Macroscopic and microscopic mechanical properties of ceramic composites have been investigated. A general analytical expression was obtained for the steady-state matrix cracking stress in composites that fail noncatastrophically. The solution is expressed in terms of the stress-displacement relation that characterizes stretching of the fibers between the crack surfaces, and is applicable to any reinforcement that forms crack bridging ligaments, including ductile reinforcements. The influence of statistical distributions of fiber strengths on nonsteady-state and steady-state matrix cracking, as well as on transitions in failure mechanism between catastrophic and noncatastrophic modes, has been evaluated. The indentation fiber-pushing technique that was developed previously under this contract for measuring fiber-matrix interfacial properties has been further extended to allow measurement of residual stresses in individual fibers.

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA204618

Entities

People

  • D. Marshall

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Elastic Properties
  • Failure Mode And Effect Analysis
  • Material Degradation Processes
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Properties
  • Mechanical Working
  • Mechanics
  • Micromechanics
  • Modulus Of Elasticity
  • Stress Strain Relations

Readers

  • Fluid Dynamics.
  • Materials Science (Mechanical Engineering).
  • Structural Health Monitoring of Composite Structures.