3点曲げ試験片の板厚による拘束効果の影響に関する研究

概要

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The thickness effect of three point bend (3PB) specimen on dimple fracture behavior is studied experimentally and numerically. At first, fracture toughness tests were conducted using 3PB specimens with different thicknesses. Fracture toughness values and R-curves are obtained and the thickness effect is discussed. Using Scanning Electron Microscope (SEM), dimple fracture surfaces are observed precisely. It is found that the thickness effect appears clearly on the void growth process. FEM analyses are conducted based on these experimental data. Using Gurson's constituteve equation, nucleation and growth of void during dimple fracture process is simulated. The distribution patterns of stress triaxiality and crack growth process are obtained. The results show good agreement with experimetal ones qualitatively. The effect of the specimen thickness on R-curves are explained well based on these numerical simulation.
一般社団法人日本機械学会の論文
2004-12-25