Effects of Artificial Cracks and Poisson's Ratio Upon Photoelastic Stress Intensity Determination
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF ENGINEERING SCIENCE AND MECHANICS
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A series of stress freezing photoelastic experiments were performed with multiple replications upon edge cracked strips for three types of cracks in current use i Rectangular slots 0.152 mm wide, ii 1.59 mm wide slots terminating in a 30 degrees vee notch of approximately 0.025 mm root radius, and iii Natural cracks approximately 0.0025 mm root radius. Stress intensity results were compared with the Gross-Srawley Analysis in addition i was compared with Savins solution. It was concluded that ii and iii yield the same results but i was slightly higher. Both ii and iii were about 12 higher than the Gross-Srawley results. This is conjectured to be related to a Poissons Ratio Effect.