Coupled Thermal-Mechanical Fixed-Grid Finite-Element Model With Application to Initial Solidification
Zhu, Hong
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https://hdl.handle.net/2142/87764
Description
Title
Coupled Thermal-Mechanical Fixed-Grid Finite-Element Model With Application to Initial Solidification
Author(s)
Zhu, Hong
Issue Date
1997
Doctoral Committee Chair(s)
Thomas, Brian G.
Department of Study
Theoretical and Applied Mechanics
Discipline
Theoretical and Applied Mechanics
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Engineering, Mechanical
Language
eng
Abstract
A coupled transient finite-element model based on the fixed-grid implementation of this formulation is developed to simulate temperature, shape, and stress development in a solidifying steel shell during the initial stage of continuous casting. This verified model is applied to predict the distorted shape of a vertical section through the solidifying shell, during a sudden fluctuation in liquid level at the meniscus. The results show that thermal stress causes the exposed portion of the thin shell to bend towards the liquid, when there is a severe, sudden drop in liquid level. The subsequent rise in liquid level increases the bending. These results illustrate an important mechanism contributing to the formation of transverse surface depressions and short longitudinal surface cracks associated with severe liquid level fluctuations.
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