Abstract
A semi-theoretical and experimental approach is employed herein to investigate plates with 90, 75, 60, 45 and 30° oblique single edge cracks subjected to tensile loading. A series of tension tests were performed and the effect of the variation of the length of the cracks on the stress intensity factors were studied. Experimental measurements show that the mode one and two stress intensity factors are related mainly to the size of the caustic (optical singularity measured on a screen at a distance Z 0 from the screen), the length and the angle of the crack, and the width of the specimen. The calculated values of the semi-theoretical stress intensity factors were corroborated with the theoretical results; and then the method was further utilized to investigate more complicated oblique edge cracks subjected to tension. In particular, the stress intensity factors of plates with oblique 45° equal parallel edge cracks were studied by this method and the results were checked with the stress intensity factors of single oblique edge cracks.
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