中空試片によるストランド内未凝固鋳片の変形挙動の模型実験

概要

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The deformation behavior of a continuously cast strand under solidification is complicated because of the interaction among wide faces, narrow faces and edges of hollow box structure. Although several theoretical analyses were reported until now, deformation behavior has remained unclarified on the whole, because the above interaction effect was not taken into account in these analyses. In this paper the deformation behavior of a continuously cast strand under solidification is investigated through a simulation experiment with hollow rubber test pieces. The following results were obtained, which enable us to estimate accurate strain in a strand to design a continuous casting machine. 1) Unbending strain in a hollow piece varies considerably in a transverse direction, and the concept of shear lag accounts for that fact. 2) Bulging strain at a location apart from edges conforms to the elastic beam theory, while the bulging coefficient increases with decreasing shell thickness. 3) The existance of new type strain named winding round strain which occurs in an unbending region even without pressure is made certain and analysed quantitatively. 4) Additivity among different kinds of strains is ascertained. Because of phase difference between different kinds of strains, knowledge of continuous strain distribution is indispensable to estimate a crack occurrence.
社団法人日本鉄鋼協会の論文
1995-02-01