In structures having stress concentration under cyclic loading, a small crack initiates and it grows and propagates. The present paper shows the experimental results of the perforated plate having the different diameters and the prescribed different strain amplitude. In the specimens having a circular hole, a crack initiates at the hole side having the most severe stress concentration in the specimen, and then the other crack also starts to initiate at the opposite hole side. Growth of both cracks is observed from the photographs taken at each cycle to study the relation between crack growth and load decrease. The feature of crack growth initiating from multiple origins will be discussed for fatigue test. The crack initiation is evaluated by referring to the accumulation law using the simplified estimation scheme, and the crack growth is evaluated by referring the increment of J-Integral. The agreement for crack initiation and propagation with these test results will be discussed.

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