Accession Number:

AD0270178

Title:

AN INVESTIGATION OF THE THEORETICAL AND PRACTICAL ASPECTS OF THE THERMAL EXPANSION OF CERAMIC MATERIALS

Descriptive Note:

Corporate Author:

CORNELL AERONAUTICAL LAB INC BUFFALO N Y

Personal Author(s):

• SCHEETZ,HOWARD

Report Date:

1961-11-30

Pagination or Media Count:

1.0

Abstract:

Extrapolation of elastic moduli data for porous ceramic bodies for porosities of 5 or less leads to values for the fully-dense body which lie between those computed by space averaging of single-crystal elastic stiffness and compliance constants. The elastic properties of composite bodies, including multiple-phase ceramics, may be predicted with small error for bodies which remain continuous solids by a method developed by Kerner. The elastic moduli which should be used for ceramics corresponds to the values for the fully-dense polycrystalline body rather than the lower values associated with the more readily available porous ceramics. The validity of Kerners method for prediction of thermal expansion for multiple-phase ceramics was clearly shown for three different two-phase systems. Author

Descriptors:

• *CERAMIC MATERIALS
• *SPINEL
• *THERMAL EXPANSION
• ALUMINUM
• ALUMINUM COMPOUNDS
• COMPOSITE MATERIALS
• GLASS
• HIGH TEMPERATURE
• MAGNESIUM COMPOUNDS
• MATHEMATICAL ANALYSIS
• MECHANICAL PROPERTIES
• MIXTURES
• OXIDES
• POROUS MATERIALS
• REFRACTORY MATERIALS
• SILICON COMPOUNDS
• THEORY
• ULTRASONIC RADIATION

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE