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Fusion Engineering and Design 82 (2007) 22332238 Application of discrete element method to study mechanical
 

Summary: Fusion Engineering and Design 82 (2007) 22332238
Application of discrete element method to study mechanical
behaviors of ceramic breeder pebble beds
Zhiyong An, Alice Ying, Mohamed Abdou
Mechanical and Aerospace Engineering Department, UCLA, Los Angeles, CA 90095, United States
Received 31 July 2006; received in revised form 31 January 2007; accepted 1 February 2007
Available online 23 March 2007
Abstract
In this paper, the discrete element method (DEM) approach has been applied to study mechanical behaviors of ceramic breeder
pebble beds. Directly simulating the contact state of each individual particle by the physically based interaction laws, the DEM
numerical program is capable of predicting the mechanical behaviors of non-standard packing structures. The program can also
provide the data to trace the evolution of contact characteristics and forces as deformation proceeds, as well as the particle
movement when the pebble bed is subjected to external loadings. Our numerical simulations focus on predicting the mechanical
behaviors of ceramic breeder pebble beds, which include typical fusion breeder materials in solid breeder blankets. Current
numerical results clearly show that the packing density and the bed geometry can have an impact on the mechanical stiffness of
the pebble beds. Statistical data show that the contact forces are highly related to the contact status of the pebbles.
2007 Elsevier B.V. All rights reserved.
Keywords: Discrete element method; Breeding materials; Pebble beds
1. Introduction
In recent decades, substantial engineering problems

  

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

 

Collections: Plasma Physics and Fusion