Critical Aspect Ratio for Tungsten Fibers in Copper-Nickel Matrix Composites

Abstract

Stress-rupture and tensile tests were conducted at 816 deg C (1500 deg F) to determine the effect of matrix composition on the minimum fiber length to diameter ratio (critical aspect ratio) below which fibers in a tungsten fiber/copper-nickel alloy matrix composite could not be stressed to their ultimate load carrying capability. This study was Intended to simulate some of the conditions that might be encountered with materials combinations used in high-temperature composites. The critical aspect ratio for stress-rupture was found to be greater than for short-time tension, and it increased as the time to rupture increased. The Increase was relatively slight, and calculated fiber lengths for long service appear to be well within practical size limits for effective reinforcement and ease of fabrication of potential gas turbine components.

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Document Details

Document Type
Technical Report
Publication Date
Oct 01, 1975
Accession Number
ADA379384

Entities

People

  • Robert W. Jech

Organizations

  • National Aeronautics and Space Administration

Tags

DTIC Thesaurus Topics

  • Alloys
  • Aspect Ratio
  • Composite Materials
  • Copper Nickel Alloys
  • Failure Mode And Effect Analysis
  • Heat Resistant Alloys
  • High Temperature
  • Materials
  • Materials Processing
  • Mechanical Properties
  • Metal Matrix Composites
  • Nickel Alloys
  • Shear Strength
  • Shear Stresses
  • Tensile Strength
  • Tensile Stress
  • Turbine Components

Fields of Study

  • Materials science

Readers

  • Combustion and Flow Dynamics.
  • Reinforced Composite Materials
  • Systems Analysis and Design