Static Fracture Behavior of a Ceramic Matrix Composite at Elevated Temperatures

Abstract

This study investigated systematically the damage initiation damage progression, and failure modes of a ceramic matrix composite, Nicalon/CAS, when loaded in tension at elevated temperatures in the presence of air. A cross-ply lay-up, (0/90) 2s, was studied. The primary means of analysis were stress-strain data taken during monotonic and incremental load tests and crack density assessments. Testing was conducted at room temperature 700 deg C, and 850 deg C. The stress-strain response was consistent for monotonic and incremental loading, except for a decrease in failure load at the elevated temperatures. Initial damage progression was also consistent, but the damage leading to failure and the final failure mode at 850 deg C were different due to the oxidation of the fibers. The oxidation created a brittle interface between the fiber and matrix, which resulted in an increase in fiber pull-out at the failure surface.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1993
Accession Number
ADA275363

Entities

People

  • David M. Agins

Organizations

  • Air Force Institute of Technology

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Actuators
  • Ceramic Matrix Composites
  • Composite Materials
  • Control Systems
  • Elastic Properties
  • Failure Mode And Effect Analysis
  • High Temperature
  • Laminates
  • Material Degradation Processes
  • Materials
  • Materials Testing
  • Modulus Of Elasticity
  • Silicon Carbide
  • Stress Strain Relations
  • Stresses
  • Test Equipment
  • Turbines

Fields of Study

  • Materials science

Readers

  • Reinforced Composite Materials
  • Structural Health Monitoring of Composite Structures.