金属材料の引張破面性状不規則性の定量評価におけるフラクタル解析の適用

概要

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Analytical procedure to evaluate the surface irregularity of tensile fracture surfaces for several carbon steels was developed by applying a concept of fractal and a curve fitting technique. Main conclusions obtained in this study are summarized as follows;(1)Tensile fracture surfaces for pure iron and carbon steels such as S 25 C, S 35 C, S 45 C and S 55 C heat-treated under several conditions have the fractal nature. (2)It is found that the geometrical irregularity of the fracture surface is well evaluated by combining the fractal dimension and additional indices governed by several factors such as heat-treatment condition, carbon content and mechanical properties. (3)Fractal dimension D and additional indices for the fracture surface nature such as C^* and (B-E)/A have a definite relation to the carbon content and mechanical properties such as elongation, yield stress and tensile strength. Especially, index of (B-E)/A is significantly related to the fracture model and the strength level of the materials.
社団法人日本機械学会の論文
2000-04-25