In this paper the crack growth in rotary disks with eccentricity hole are studied using both emulator and finite element techniques. It is assumed that a crack which is initiated from the inner surface of a disk is developed in radial direction and in longitudinal direction by length a. The effects of different parameters such as the disk radius, the distance between the hole and the disk center, the crack length and the radius of the hole on the behavior of the crack growth are investigated. The results of the FEM and the emulator techniques are used to establish a mathematical statement predicting the crack growth and the stress intensity factor. The effects of each parameter for any of the proposed model during the crack growth are studied separately. The mathematical model can be used to predict the crack growth and the stress intensity factor precisely and conveniently.

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