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3D Micromechanical modeling of packed beds Zi Lu, Mohamed Abdou *, Alice Ying

Summary: 3D Micromechanical modeling of packed beds
Zi Lu, Mohamed Abdou *, Alice Ying
Mechanical and Aerospace Engineering Department, University of CaliforniaħLos Angeles,
44-114 Engineering IV, P.O. Box 951597, Los Angeles, CA 90095-1597, USA
Received 5 March 2001; accepted 17 August 2001
A new 3D numerical model has been developed to simulate the thermal and mechanical characteristics of packed
beds used in fusion reactor blankets and other applications. This method is based on an explicit numerical scheme
which monitors the interaction of the particles contact by contact and their motion particle by particle. In this paper, a
mathematical formulation as well as a model which predicts the packed bed thermomechanical states under imposed
and induced loads are presented. The model is validated by comparing the numerical simulations with thermal ex-
pansion and uniaxial compression experiments of packed beds. The results of the calculated bed eective modulus
compares reasonably well with the experimental data. Ó 2001 Elsevier Science B.V. All rights reserved.
1. Introduction
Packed beds have been considered for shielding and
tritium breeding as well as neutron multiplication in
fusion reactor blanket designs. During the reactor op-
eration, the blanket structure restrains the expansion of
the packed beds and, therefore, causes stresses. The
larger expansion of the packed beds in comparison with


Source: Abdou, Mohamed - Fusion Science and Technology Center, University of California at Los Angeles


Collections: Plasma Physics and Fusion