Metallurgical Characterization of the Interfaces and the Damping Mechanisms in Metal Matrix Composites.

Abstract

Fiber reinforced metal matrix composites (MMC) are candidate structural materials for space applications because of their high specific modulus, low CTE, high electrical and thermal conductivity and high environmental resistance. Furthermore, the need for dynamic dimensional precision and weight savings in space structures suggests inherent material damping as an additional property requirement. A preliminary investigation indicates MMC exhibit improved damping with respect to conventional structural alloys of aluminum or titanium. In the present investigation, a graphite-aluminum composite (P55/6061) has been selected to study the microstructural features and mechanisms responsible for damping in MMC. The objectives for this reporting period have been; Establish a reliable test method and its limitations; Develop reproducible damping test data at different frequencies and strain amplitude; Thorough metallurgical characterizations of interfaces; Suggest an operative damping mechanism in MMC; and Recommendations for further investigations.

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Document Details

Document Type
Technical Report
Publication Date
Apr 15, 1986
Accession Number
ADA169186

Entities

People

  • Mohan S. Misra

Organizations

  • Martin Marietta

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Aluminum
  • Aluminum Alloys
  • Amplitude
  • Composite Materials
  • Contracts
  • Frequency
  • Graphitic Materials
  • Materials
  • Materials Testing
  • Measurement
  • Mechanics
  • Metal Matrix Composites
  • Metals
  • Military Research
  • Phase Shift
  • Test Methods
  • Thermal Conductivity

Fields of Study

  • Materials science

Readers

  • Control Systems Engineering.
  • Reinforced Composite Materials

Technology Areas

  • Space