抄録
Photoelastic experiments employing stress freezing technique were performed to determine mixed mcde Stress-intensity Factors KI and KII of edge cracked strips subjected to uniaxial tensile loading and out plane bending separately. By plotting of normalized apparent SIF vs. square root of normalized distance from the crack tip on the base of isochromatic fringe patterns in the restricted region around a crack tip, the values of these corresponding SIF were obtained. The determined SIF values of tensile specimen in stress frozen state were shown to agree reasonably compare with the complete two dimensional solution in consideration of three dimensional effect. The bending tests were conducted on four strips containing edge cracks inclined to each different direction. Every piece of slices parallel to these strips taken. out from these stress frozen strips was researched following the same photoelastic procedure as described above using multiple fringe photographs. As the results, the variations of tilt angle θm in fringe pattern, values of KI, KII and its ratio correspond to each depth of these strips formed by different crack angle were presented.
