Abstract
Gasturbines are provided with cut-outs for minimizing vibrations. Round cut-outs 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 cut-outs. Round, square and elliptical cut-outs 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.
Highlights
A gas turbine, known as a combustion turbine is an inward burning motor
It is observed that a square cutout at 45 ̊ orientation has the least stress concentration
Crack initiation starts at geometric discontinuity and crack propagates when component is under plastic deformation
Summary
A gas turbine, known as a combustion turbine is an inward burning motor. It consists of an upstream rotary compressor coupled to a downstream turbine and an ignition chamber at the center. Sewer vents are either circular or roundabout. Plane windows are rectangular in shape with chamfer at the corners [1]. Definite shapes are found as access ports for electrical and mechanical systems or for the reduction of weight [2]. Round cutouts are favored due to its simple geometry but there are various designs which offer more advantages over the circular shape.
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