Bursting Tests of Steam-Turbine Disk Wheels

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Abstract
Bursting tests on model disks of steam-turbine-rotor material both with and without a central hole show that the average hoop stress at bursting speed for a good alloy steel is likely to exceed the tensile strength of the material as determined in an ordinary tensile test whether or not the hole is present. With a good turbine-wheel material, the maximum stress at bursting speed in a flat disk, calculated on the basis of elastic theory, greatly exceeds the tensile strength of the material; and if there is a central hole, it is more than double the tensile strength. Thus a comparison of tensile strength with average hoop stress in a wheel gives a fairly reasonable estimate of the factor of safety against actual bursting. Test results are also given on low-carbon and on high-alloy materials.

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