Neutron diffraction measurements and modeling of residual strains in metal matrix composites Page: 1 of 11
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NEUTRON DIFFRACTION MEASUREMENTS AND MODELING OF RESIDUAL STRAINS
IN METAL MATRIX COMPOSITES
A. Saigal and G.G. Leisk
Department of Mechanical Engineering
Tufts University
Medford, MA 02155
C.R. Hubbard, S.T. Misture and X.L. Wang
High Temperature Materials Laboratory
Metals and Ceramics Division
Oak Ridge National Laboratory
Oak Ridge, TN 37831-6064
Abstract
Neutron diffraction measurements at room temperature are used to characterize the
residual strains in tungsten fiber-reinforced copper matrix, tungsten fiber-reinforced
Kanthal matrix, and diamond particulate-reinforced copper matrix composites. Results of
finite element modeling are compared with the neutron diffraction data. In
tungsten/Kanthal composites, the fibers are in compression, the matrix is in tension, and
the thermal residual strains are a strong function of the volume fraction of fibers. In copper
matrix composites, the matrix is in tension and the stresses are independent of the
volume fraction of tungsten fibers or diamond particles and the assumed stress free
temperature because of the low yield strength of the matrix phase.
Introduction
Tungsten fiber-reinforced copper composite systems provide high thermal conductivity
and good creep/fatigue resistance, and as a consequence are considered for possible
use in high temperature, space propulsion environments [1]. FeAI and FeCrAI alloys,
such as Kantha, have been shown to exhibit outstanding high-temperature
oxidation/corrosion resistance and therefore have great potential for use as corrosion-
resistant cladding in a variety of high-temperature applications [2,3). In addition, FeAI
alloys and tungsten fiber-reinforced Kanthal metal matrix composites have been
developed with improved mechanical behavior and weldability for possible applications in
space structures [41. However, thermal residual stresses are developed as a result of the
mismatch of the coefficients of thermal expansion between those of the tungsten fibers
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Saigal, A.; Leisk, G.G.; Hubbard, C.R.; Misture, S.T. & Wang, X.L. Neutron diffraction measurements and modeling of residual strains in metal matrix composites, report, April 1, 1996; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc669990/m1/1/: accessed April 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.