The frozen stress photoelastic technique was used to determine the hoop and radial stresses at the hole boundaries of sixty different hole configurations in flat discs. Each had one ring of holes, evenly spaced on one pitch circle, concentric with the periphery and bore.
The ratio of radial-hoop hole boundary stress was related to the radial-hoop stress ratio of plain discs, the hole spacing and hole diameter in a manner which permits quick determination of optimum hole spacing for the range of bores, pitch circle and hole diameters used in gas turbine discs. The peak stresses can also be predicted in non-optimum configurations.
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