Observations on residual stresses in ceramic composites by neutron diffraction techniques. [SiC whisker--Al/sub 2/O/sub 3/ matrix]
This paper presents a comparison between the residual thermal stresses and strains, developed during cooling of a ceramic-ceramic (SiC--Al/sub 2/O/sub 3/) composite, determined by analytical methods and by an experimental neutron diffraction technique. Because the coefficient of thermal contraction of the matrix (Al/sub 2/O/sub 3/) is greater than that of the residual stresses were determined by using two self-consistent models. In the first, a plane strain composite cylinder model, the fibers are approximated as infinitely long circular cylinders. In the second, due to Eshelby, the fibers are approximated as ellipsoids (specialized to prolate spheroids in this case). The two models give almost identical estimates of the stresses and strains in the fibers. The interpretation of the measured strains in the fibers by neutron scattering has some uncertainty because of the lack of a clearly defined crystal structure of SiC. However, in general, the measured and calculated strains are reasonably close. 15 refs., 8 figs.
- Research Organization:
- Argonne National Lab., IL (USA)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 5025514
- Report Number(s):
- CONF-880118-8; CONF-880118-; ON: DE88009937
- Resource Relation:
- Conference: 12. annual conference on composites and advanced ceramic materials, Cocoa Beach, FL, USA, 20 Jan 1988
- Country of Publication:
- United States
- Language:
- English
Similar Records
Strain and fracture in whisker reinforced ceramics. [Al/sub 2/O/sub 3/-SiC whiskers]
Mechanically induced residual stresses in Al/SiC composites
Related Subjects
COMPOSITE MATERIALS
RESIDUAL STRESSES
STRESS ANALYSIS
REINFORCED MATERIALS
ALUMINIUM OXIDES
FIBERS
NEUTRON DIFFRACTION
POISSON RATIO
SILICON CARBIDES
TEXTURE
THERMAL EXPANSION
THERMAL STRESSES
WHISKERS
YOUNG MODULUS
ALUMINIUM COMPOUNDS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
COHERENT SCATTERING
CRYSTALS
DIFFRACTION
EXPANSION
MATERIALS
MECHANICAL PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
SCATTERING
SILICON COMPOUNDS
STRESSES
360603* - Materials- Properties