Behavior of Metal Matrix Composite Materials at Cryogenic Temperatures

Abstract

This report lists the results of mechanical tests, specifically ultimate strength, modulus of elasticity, strain-to-failure, and proportional limit, of graphite P100/6061, 25 volume percent SiC/2024, and 25 volume percent B4C/6061 at -300 deg F, room temperature, and 250 F. The latter two were evaluated using notch specimens. These results showed that the B4C/6061 was severely damaged by a notch and that the SiC/6061 was only moderately damaged; however, the notch tensile at -300 deg F was only slightly lower than that at 70 F. The only effect of thermal cycling between 300 F and 250 deg F was from overaging. The Gr/6061, on the other hand, was severely damaged due to warpage and face sheet cracking. The modulus of the Gr/6061 is reduced at -300 deg F because the 6061 is stressed beyond the yield strength and contributes little to the modulus of the composite.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Aug 18, 1990
Accession Number
ADA252016

Entities

People

  • Russell G. Sherman

Tags

Communities of Interest

  • Space
  • Weapons Technologies

DTIC Thesaurus Topics

  • Advanced Materials
  • Composite Materials
  • Elastic Properties
  • Graphitic Materials
  • Jet Propulsion
  • Materials
  • Materials Laboratories
  • Materials Science
  • Mechanical Properties
  • Metal Matrix Composites
  • Modulus Of Elasticity
  • Plastic Explosives
  • Tensile Modulus
  • Tensile Properties
  • Tensile Strength
  • Tensile Testing
  • Yield Strength

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Powder metallurgy of Titanium alloys.
  • Structural Health Monitoring of Composite Structures.