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Residual Stress Measurements in Continuous Fiber Titanium Matrix Composites

Published online by Cambridge University Press:  06 March 2019

M. R. James ,
M. A. Bourke ,
J. A. Goldstone  and
A. C. Lawson
M. R. James
Affiliation:
Rockwell International Science Center, Thousand Oaks, CA 91360
M. A. Bourke
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
J. A. Goldstone
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
A. C. Lawson
Affiliation:
Los Alamos National Laboratory, Los Alamos, NM 87545
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Abstract

Metal matrix composites develop residual strains after consolidation due to the thermal expansion mismatch between the reinforcement fiber and the matrix. X-ray and neutron diffraction measured values for the longitudinal residual stress in the matrix of three titanium MMCs are reported. For thick composites (> 6 plies) the surface stress measured by x-ray diffraction matches that determined by neutron diffraction and therefore represents the stress in the bulk region consisting of the fibers and matrix. For thin sheet composites, the surface values are lower than in the interior and increase as the outer rows of fibers are approached. While a rationale for this behavior has yet to be developed, accounting for composite thickness is important when using x-ray measured values to validate analytic and finite element calculations of the residual stress state.

Type
IX. Stress and Strain Determination by Diffraction Methods, Peak Broadening Analysis
Information
Advances in X-Ray Analysis , Volume 36: Forty-First Annual Conference on Applications of X-ray Analysis, August 3-7, 1992 , 1992 , pp. 481 - 488
Copyright
Copyright © International Centre for Diffraction Data 1992

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