Thermally induced micromechanical stresses in ceramic/ceramic composites

Conference · Sun Nov 01 04:00:00 EST 1992

OSTI ID:10116541

Li, Zhuang ^[1]; Bradt, R C ^[2]

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1. Argonne National Lab., IL (United States)
2. Nevada Univ., Reno, NV (United States). Mackay School of Mines

The internal micromechanical stresses which develop in ceramic-ceramic composites as a consequence of temperature changes and thermoelastic property differences between the reinforcing and matrix phases are addressed by the Eshelby method. Results for two whisker reinforced ceramic matrix composites and for quartz particles in porcelain are discussed. It is concluded that the stresses which develop in the second phase reinforcing inclusions are quite substantial (GPa-levels) and may be highly anisotropic in character. These stresses are additive to the macroscopic thermal stresses from temperature gradients which are encountered during heating and cooling, and also to externally apphed mechanical stresses (loads). These micromechanical stresses are expected to be highly significant for thermal cycling fatigue and other failure processes.

• Research Organization: Argonne National Lab., IL (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States); National Aeronautics and Space Administration, Washington, DC (United States)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 10116541
• Report Number(s): ANL/MSD/CP--78152; CONF-9211157--1; ON: DE93004860; CNN: Grant NAGW-199
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603
CERAMICS
COMPOSITE MATERIALS
MECHANICAL PROPERTIES
PORCELAIN
QUARTZ
REINFORCED MATERIALS
THERMAL CYCLING
THERMAL STRESSES
WHISKERS