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Determinations of Residual Thermal Stresses in a SiC‐Al 2 O 3 Composite Using Neutron Diffraction
Author(s) -
MAJUMDAR SAURIN,
KUPPERMAN DAVID,
SING JITENDRA
Publication year - 1988
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1988.tb07536.x
Subject(s) - materials science , neutron diffraction , whiskers , residual stress , composite material , composite number , thermal expansion , diffraction , whisker , thermal , thermodynamics , optics , physics
Residual thermal stresses and strains, developed during cooling of a SiC whisker‐Al 2 O 3 composite, were determined by an experimental neutron diffraction technique and the results were compared with analytically determined values. High compressive residual thermal stresses were generated in the whiskers during cooldown after sintering. Analytical estimates of the residual stresses were obtained by using two self‐consistent models: (1) a plane strain composite cylinder model and (2) Eshelby's ellipsoidal inclusion theory. The two models gave almost identical estimates of the stresses and strains in the whiskers. The interpretation of the measured strains in the whiskers by neutron diffraction had some uncertainty because of the lack of a clearly defined crystal structure of SiC.