局所くびれ解析におけるStoren-RiceとHillの手法の等価性

概要

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Application range of Storen-Rice Method is discussed which is used for estimating the formability in stretch forming of sheet metals. One of the famous methods for analyzing localized necking had been proposed by Hill. But, the application of his analysis must be confined in tha bi-axial forming where there is at least the direction with no stretching, ie, ε_<tt>=0 in the forming sheet. Hence, this condition becomes an obstacle for its application in biaxial stretch forming. Storen-Rice proposed Δε_<tt>=0, in place of ε_<tt>=0, where Δ denotes difference between the regions separated by necking plane. This proposal is suggesting that the condition Δε_<tt>=0 might be removed, but it has not been proved whether tha removal of the condition is realized or not. Then, on the equilibrium condition proposed in their analysis, the range of applicable forming is examined where tha existence of multiple solution can be made sure. Consequently, it is found that it is possible to have multiple solution in the only forming condition satisfying Δε_<tt>=0. Therefore, tha forming limit obtained in biaxial stretching are in the outside of the application range, and they are an imaginary solution.
社団法人日本材料学会の論文
1998-06-15