Accession Number : AD0837408

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

Descriptive Note : Master's thesis,

Corporate Author : AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING

Personal Author(s) : Mantei, John E.

Report Date : JUN 1968

Pagination or Media Count : 82

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)

Descriptors :   (*COMPOSITE MATERIALS, MECHANICAL PROPERTIES), ALUMINUM, BORON, WHISKERS(CRYSTALS), POISSONS RATIO, STRAIN(MECHANICS), LOADS(FORCES), MATHEMATICAL MODELS, MODULUS OF ELASTICITY, METALLOGRAPHY, RADIOGRAPHY, THESES, DIFFUSION BONDING.

Subject Categories : Metallurgy and Metallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE