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We consider the impact of a ring crack within a rotating hollow cylinder offixed height under axisymmetric (torsion) loading. The form of the displacementis obtained from the equation of motion using the Fourier sin transform. Thedisplacement jump over the crack is obtained from the boundary condition on thetangential stress, formulated as a singular integral equation which is solvedby the method of orthogonal polynomials. The stress intensity factors on theopposing crack surfaces are calculated. The dependence of the crack extensionon the problem geometry is investigated, including the impact of the crack'slocation, cylinder's height, torsion loading and rotation frequency. Possibleextensions of the model to cover fatigue cracking are considered. A practicaltest to detect and locate cracks within a rotating cylinder is outlined.

Hidden ring crack in a rotating cylindrical shell under torsion