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:

1968-06-01

Pagination or Media Count:

82.0

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 Poissons 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