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

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 Kerner's method for prediction of thermal expansion for multiple-phase ceramics was clearly shown for three different two-phase systems. (Author)

Document Details

Document Type
Technical Report
Publication Date
Nov 30, 1961
Accession Number
AD0270178

Entities

People

  • Howard Scheetz

Organizations

  • Calspan

Tags

DTIC Thesaurus Topics

  • Bodies
  • Ceramic Bodies
  • Ceramic Materials
  • Composite Materials
  • Crystals
  • Elastic Properties
  • Extrapolation
  • Materials
  • Mechanical Properties
  • Physical Properties
  • Polycrystals
  • Porosity
  • Single Crystals
  • Stiffness
  • Thermal Expansion

Fields of Study

  • Materials science

Readers

  • Combustion and Flow Dynamics.
  • Computational Modeling and Simulation
  • Reinforced Composite Materials

Technology Areas

  • Space
  • Space - Orbital Debris