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Analytical Solution for the Critical Velocity of Pushing/Engulfment TransitionThe distribution of ceramic particles in a metal matrix composite material depends primarily on the interaction of the particles with the solid/liquid interface during the solidification process. A numerical model that describes the evolution of the shape of the solid/liquid interface in the proximity of a foreign particle will presented in this paper. The model accounts for the influence of the temperature gradient and the Gibbs-Thomson and disjoining pressure effects. It shows that for the systems characterized by k(sub p) < k(sub L) the disjoining pressure causes the interface curvature to change its sign in the close-contact particle/interface region. It also shows that the increase of the temperature gradient diminishes the effect of the disjoining pressure. The analysis of the numerical results obtained for a large range of processing conditions and materials parameters has led to the development of an analytical solution for the critical velocity of pushing/engulfinent transition. The theoretical results will be discussed and compared with the experimental measurements performed under microgravity conditions.
Document ID
20040050344
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Catalina, Adrian V.
(BAE Systems Analytical Solutions, Inc. Huntsville, AL, United States)
Stefanescu, Doru M.
(Alabama Univ. Tuscaloosa, AL, United States)
Sen, Subhayu
(BAE Systems Analytical Solutions, Inc. Huntsville, AL, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Composite Materials
Meeting Information
Meeting: Transactions Mineral and Metals Annual Conference
Location: Charlotte, NC
Country: United States
Start Date: March 14, 2004
End Date: March 18, 2004
Funding Number(s)
CONTRACT_GRANT: NAS8-02096
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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