Analysis of thermal and mechanical behavior of high heat flux facing copper walls
Li, Guowei
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https://hdl.handle.net/2142/22336
Description
Title
Analysis of thermal and mechanical behavior of high heat flux facing copper walls
Author(s)
Li, Guowei
Issue Date
1996
Doctoral Committee Chair(s)
Thomas, Brian G.
Department of Study
Nuclear, Plasma, and Radiological Engineering
Discipline
Nuclear, Plasma, and Radiological Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Applied Mechanics
Engineering, Mechanical
Engineering, Nuclear
Language
eng
Abstract
Analysis of thermal and mechanical behavior of copper walls under high heat flux loading has been performed, including plasticity, creep, and thermal cyclic fatigue. Two and three dimensional finite element models for the first wall in ITER fusion reactor and the mold in continuous slab casting have been developed to simulate the heat transfer, thermal stress, distortion, and the results applied to predict the lifetimes of these structures. The simulation domain of the ITER first wall contains four regions which are made of three different materials, i.e., beryllium, copper and stainless steel. The 3D model for casting mold incorporates the geometry effects of mold curvature, round-rooted water channels with variable spacing and depth and the gradual ending of the water channels at the top and bottom of the mold. These models have been verified with fatigue experiments on bimetallic bond specimens and measurements of the residual distorted shape. Properties of the copper alloys, such as the thermal conductivity, thermal expansion coefficient, elastic and plastic modulus, creep law, and lifetime prediction correlations have been obtained from the literature. Some of them have been calibrated based on the experimental fatigue tests. The commercial package ABAQUS was used to conduct all the numerical simulations. The effects of thermal loading condition, mode of constraint, wall material, and manufacturing issues, such as incomplete contact at the tube/copper junction, have been investigated for the ITER first wall. The models predict that the ITER first wall should last past its design lifetime if it is allowed to expand. Predictions of the three dimensional simulation of the continuous casting slab mold have been compared with the measurements of mold distortions. Reasonable agreement between the predicted and experimental results of mold distortion due to thermal creep at elevated temperature has been obtained. Thermal loading and constraint mode of copper walls are found to be important to the temperature and stress levels, plasticity, creep, and lifetime of the copper walls. Predicted stress distribution and lifetime depends greatly on constraint conditions.
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