切欠材の塑性拘束と局部ひずみの推定法

概要

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Plastic constraint and local strain at the notch root for notched plates and bars were examined in the elastic-plastic and full plastic regions by FEM. By introducing the mean equivalent stress, σ(Mises), and the strain, ε, at the minimum cross section, and the equivalent stress concentration factors, K_t, the results obtained in this study are summarized as follows: (1) The plastic constraint factor k defined by σ/σ_n was nearly constant under the wide range of deformations, and independent of the material constants. (2) The general yield stress σ_GY was derived based on the idea that the mean equivalent strain in the elastic state is almost equal to that in the plastic state. (3) The relationship between σ and ε for σ≧σ_GY was approximately in accord with the constitutive equation of the materials and was ε=Bσ^m for σ≦σ_GY. (4) The equivalent strain, ε, at the notch root was simply estimated from ε=K_t ε.
一般社団法人日本機械学会の論文
1990-08-25