Thermal expansion behavior and analysis for Al-Si eutectic alloys and the composite material systems: Al-SiC and Al-W

Thesis/Dissertation · Wed Jan 01 00:00:00 EST 1986

OSTI ID:6954305

Hahn, T A

Analytical solutions were obtained for the thermal stress and strain of both concentric spheres and concentric cylinders comprised of dissimilar materials. Previously derived formulations for elastic interactions between the materials were extended to include a plastically deforming shell for both the spherical and cylindrical models. Thermal expansion measurements were performed on Al-Si alloys, aluminum alloy silicon carbide composites, and aluminium alloy tungsten composites. These measurements include detailed observations on heating and cooling over repeated temperature cycles between room temperature and 500/sup 0/C. Changes in the expansivity were observed in various temperature intervals that cannot be related to volume fraction rules of mixtures or to composite theory based on purely elastic behavior of the materials. The models developed, in part, relate the differences in the observed expansivity between heating and cooling to plastic deformation of the shell material. The differences in expansivity between heating and cooling result in linear changes in dimensions after thermal cycling.

• Research Organization: Maryland Univ., College Park (USA)
• OSTI ID: 6954305
• Resource Relation: Other Information: Thesis (Ph. D.)
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
THERMAL EXPANSION
COMPOSITE MATERIALS
SILICON ALLOYS
SILICON CARBIDES
TUNGSTEN
CYLINDERS
HIGH TEMPERATURE
MEDIUM TEMPERATURE
SPHERES
STRAINS
THERMAL STRESSES
ALLOYS
CARBIDES
CARBON COMPOUNDS
ELEMENTS
EXPANSION
MATERIALS
METALS
SILICON COMPOUNDS
STRESSES
TRANSITION ELEMENTS
360603* - Materials- Properties
360104 - Metals & Alloys- Physical Properties