断面急変部における貫通疲労き裂の進展挙動に関する研究

概要

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To clarify the through fatigue crack propagation behaviour in and around the heavily changed cross-sectioned area, crack propagation rate and the crack closure were measured for the CT specimens possessing blined holes or side grooves. The results were investigated using a stress intensity factor (SIF) calculated by the three-dimensional finite element method (3D-FEM). The main conclusions are as follows: (1) under the same SIF calculated by the 3D-FEM, the crack situated in the blind hole propagates slower than that in the plane specimen; on the other hand, the crack situated before the blind hole propagates faster: (2) the reduction of the crack propagation rate in the blind hole is based on the crack closure induced by the sudden change of the cross section.
社団法人日本機械学会の論文
1990-03-25