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X-ray Elastic Constants for β-SiC and Residual Stress Anisotropy in a Hot-Pressed Al2O3/SiC(Whisker) Composite

Published online by Cambridge University Press:  06 March 2019

Paul Predecki ,
Alias Abuhasan  and
Charles S. Barrett
Paul Predecki
Affiliation:
Engineering Deptartment, University of Denver, Denver CO
Alias Abuhasan
Affiliation:
Engineering Deptartment, University of Denver, Denver CO
Charles S. Barrett
Affiliation:
Engineering Deptartment, University of Denver, Denver CO
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Abstract

X-ray elastic constants for the 511+333 and the 422 reflections of β-SiC were calculated from the single crystal data of Tolpygo using the Voigt-Reuss, Eshelby-Kroner and x-ray methods. Agreement was satisfactory for the 511+333, but less so for the 422. A hot-pressed α-Al2O3/ 29 vol % β-SiC (whisker) composite was investigated on its 3 principal faces. The total residual strains were found to be consistently anisotropic on all 3 faces suggesting that texture was present in the whiskers as a result of hot-pressing. Assuming no texture in the matrix, it was found possible to determine the average residual microstresses in the whiskers using the theory of Noyan and Cohen, without needing to know the whisker elastic constants or texture. The average microstresses were determined in each phase as well as the average residual macrostresses on each face.

Type
XII. Analysis of Stress and Fracture by Diffraction Methods
Information
Advances in X-Ray Analysis , Volume 34: Thirty-Ninth Annual Conference on Applications of X-ray Analysis, July 30 - August 3, 1990 , 1990 , pp. 643 - 650
Copyright
Copyright © International Centre for Diffraction Data 1990

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