亜鉛めっき橋梁の溶融亜鉛めっきぜい化割れ発生に関する熱弾塑性解析

概要

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The aim of the present study is to clarify the mechanical behavlor of a bridge girder during hot galvanizing. The mechanical behavior is analyzed using finite element method (FEM) analysis in which the constitutive equation is given by Bodner's viscoplastic model. The mechanism of zinc induced cracking is also discussed in detall. A shape and size parameter, Rσ_<max> is proposed and discussed. Rσ_<max> is the ratio of the maximum compressive thermal stress to the elastic buckling stress of the panel and is related to zinc induced cracking. The parameter Rσ_<max> correlates well with the final tensile strain calculated by FEM analysis. Critical strain for crack initiation, ε_c, was obtained from bending tests and from FEM analysis for several steels. Each value of Rσ_<max> at crack initiation was estimated from comparison with the final tensile strain and ε_c. The estimated critical value of Rσ_<max> is nearly the same as the critical value of Rσ_<max> obtained by calculation of the transition from non-cracking to cracking behavior of bridge girders.
社団法人日本鉄鋼協会の論文
1994-12-01