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Summary: EXPERIMENTAL & NUMERICAL STUDY OF CERAMIC BREEDER PEBBLE BED THERMAL
DEFORMATION BEHAVIOR
Zhiyong An, Alice Ying, and Mohamed Abdou
Mechanical and Aerospace Engineering Department, UCLA, Los Angeles 90095, an@fusion.ucla.edu
Experiments on thermomechanics interactions
between clad and pebble beds have been performed with
overstoichiometric lithium orthosilicate pebbles (pebble
diameters between 0.25 and 0.63 mm) at temperatures of
700-800ºC. The experimental results show that the
thermal deformation of our pebble bed system is
nonlinear and when the operating temperature is higher
than 600ºC, thermal creep deformation is generated. In
this paper, constitutive equations of the elastic and creep
deformation are derived from the experimental results.
Incorporating the effective constitutive equations in finite
element method (FEM), numerical investigations
presenting the elastic and plastic deformation
characteristics of pebble bed system are comparable to
the experimental behaviors. In addition, discrete element
method (DEM) is underdevelopment to derive constitutive
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