応力─ひずみ曲線の巨視的非線型欠陥モデル

概要

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The nonlinear-defect model, which had been previously proposed to analyze fracture and residual strain theoretically, was applied to the real stress (σ)-strain (ε) curve of steel. The results obtained are as follows: (1) When it is assumed that the cross-sectional area decreases and the stress-ccncentration appears during the final fracture resulting from propagation of a visual crack, a σ-ε curve becomes similar to that of a nonlinear-defect. (2) The three regions of strain in a σ-ε curve were analyzed and discussed. The equivalent defects in the initial region R_i should be different from those in the final region R_f, and at the character of equivalent defects in the transient region R_t should change from that in R_i to that in R_f. The σ-ε curve can be given as ε{1-β_<(ε)>ε}=A_<(ε)>σ where β and A are parameters characteristic of each region. (3) The above expression represents quantitatively the actual σ-εcurve of steel.
社団法人日本材料学会の論文
1973-02-15