Tension-Tension Fatigue Behavior of Nextel(trademark) 720/Alumina-Mullite Ceramic Composite at 1200 deg C in Air and Steam

Abstract

Uniaxial tension-tension fatigue performance of an oxide-oxide continuous fiber ceramic composite was studied at 1200 deg C in laboratory air and in steam. The composite is reinforced with laminated, 0/90 mullite/alumina (NEXTEL(trade mark)720) fibers woven in an eight-harness satin weave and has a porous alumina/mullite matrix. There is no interphase between the fiber and matrix. The composite relies on the porous matrix for crack deflection and flaw tolerance. Tension-tension fatigue was examined for maximum stresses of 45 - 136 MPa in air and in steam. To assess the effects of the steam environment on fatigue performance, experimental results obtained in air are compared to those obtained in steam. The retained properties of all specimens that achieved fatigue run-out were characterized. Composite microstructure, as well as damage and failure mechanisms, were examined.

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 2020
Accession Number
AD1110972

Entities

People

  • Sarah A. Witzgall

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Ceramic Materials
  • Ceramic Matrix Composites
  • Composite Materials
  • Failure Mode And Effect Analysis
  • Materials
  • Materials Laboratories
  • Materials Processing
  • Materials Science
  • Materials Testing
  • Mechanical Working
  • Mechanics
  • Modulus Of Elasticity
  • Silicon Carbide
  • Tensile Strength
  • Turbines
  • United States

Fields of Study

  • Materials science

Readers

  • Materials Science and Engineering.
  • Reinforced Composite Materials