Gasturbines are provided with cutouts for minimizing vibrations. Round cutouts are usually favored but there are various designs which offer more advantages over the circular shape. The objective of this work was to compare stress reduction during the induced vibration in the hollow gas turbine shafts by introducing different cutouts. Round, square and elliptical cutouts under different orientations were compared. It is observed that a square cutout at 45˚ orientation has the least stress concentration. This is due to the effective orientation of plastic strains along the principal axis.

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