ディンプルサイズの最大値分布と破壊挙動との関係

概要

論文の詳細を見る
Extreme value analysis has been applied to clarify the statistical nature of the ductile fracture surface associated with the fracture behavior of JIS SS 490 steel. Both the notched tensile specimens with different notch acuity and the unnotched specimens were employed to obtain a wide range of stress triaxiality. The ductile fracture surfaces were composed of variously sized dimples. The dimple size distributions were well expressed by the composite type of Weibull distributions. Whereas, the extreme value probability plots of the maximum dimple sizes in a given unit area were performed to correlate the dominant feature of the ductile fracture surface with the mechanical test results. As a consequence, the parameters that define the maximum dimple size distribution showed a clear dependence on the maximum stress and the fracture strains of the tensile specimens with stress triaxiality varied in four levels. Then, the extreme value analysis of the ductile fracture surface should be recommended as a powerful and effective tool for providing a quantitative information regarding the fracture behavior of the mechanical components.
一般社団法人日本機械学会の論文
2003-12-25