き裂を有する回転円板の光弾性法とコーステックス法による応力拡大係数の算定

概要

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There are various kinds of rotary machines such as the turbine rotor, compressor rotor, flywheels, etc. Fracture of blades or disks due to centrifugal force in rotary machines has often caused serious accidents. Therefore, great emphasis should be placed on studies of the intensity versus the type of fracture, as the findings obtained from such studies are applicable to safety design. Stress intensity factors K_1 are calculated by the method of photoelastic and caustic experiments, as a function of the inclination cracks of length a (a=1, 2, 3, 4, 5, 6, 7, 8 mm) at a velocity of 2 000 rpm, and are measured in models of rotating disks using the photoelastic stress freezing method. The stress intensity factor has been determined by using isochromatic fringe loops and by using a caustics pattern on the screen. The results of this experiment coincided favorably with the theoretical analysis results of Ishida and Terada.
1987-03-25