引張荷重を受ける段付き平板のすみクラックに対する応力拡大係数

抄録

The mixed-mode stress intensity factors and the effective stress intensity factors for the corner cracks of stepped plate subjected to axial tensile load are evaluated by means of photoelastic experiment. The epoxy resin models are prepared for lots of form factors on crack depth and crack angle.
The image processing analyzer is utilized to get the thinning image of the isochromatic fringe patterns around the crack tip. The intensity factors are estimated by means of personal computer using the program based on the over-deterministic method.
Those obtained stress intensity factors are summarized in the diagrams shown as the behavior for the variations of crack depth and crack angle, and the results are compared with the known theoretical results of the analogous problem, moreover, it is pointed out that the crack angle which produces the maximum effective stress intensity factor coincided with the direction of slip line of Prandel in punch problem.