AN EXAMINATION OF FACTORS THAT AFFECT THE MECHANICAL PROPERTIES OF BORON-ALUMINUM COMPOSITES.

Abstract

Filaments and diffusion-bonded boron-aluminum composites were tested to examine filament degradation and a synergistic elastic modulus. The as-received, heat-treated in air, in vacuum, and leached filament strengths were found to be 464, 439, 407, 371 ksi respectively. Filament fractures were observed in the composites. The Poisson's ratio approached the rule-of-mixtures value implying no transverse constraint. Tests demonstrated complete load transfer across a filament fracture and that no minimum volume fraction is required for strengthening. Multi-layer specimens demonstrated no synergism in modulus or strength but reflected filament degradation. The rule-of-mixtures accurately predicts the elastic modulus for low volume fraction composites. (Author)

Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1968
Accession Number
AD0837408

Entities

People

  • John E. Mantei

Organizations

  • Air Force Institute of Technology

Tags

DTIC Thesaurus Topics

  • Aluminum
  • Composite Materials
  • Degradation
  • Diffusion
  • Filaments
  • Flexural Properties
  • Mechanical Properties
  • Modulus Of Elasticity
  • Physical Properties
  • Synergism
  • Transverse

Fields of Study

  • Materials science

Readers

  • Mathematics or Statistics
  • Reinforced Composite Materials