Stress Intensities around Transverse Surface Flaws in Cylindrical Shells by Photoelastic Stress Freezing

摘要

This report documents a set of seven tests for the determination of K sub I stress intensity factors for isotropic cylinders with transverse part-circular cracks loaded in combined uniaxial extension and internal pressure. Part-circular cracks were machined into birefringent Hysol CP5-4290 photoelastic cylinders. The cylinders were then subjected to combined loading while in a stress freezing cycle. Slices of the cracks were made at various angles and analyzed with a photoelastic polariscope. A least-squares curve fit of the photoelastic data was used to generate K sub I stress intensity factors. K sub I data are plotted versus slice angle into the crack for various crack parameters. The results of the tests were compared with the results of previous tests in which the cylinders were loaded in either pure uniaxial tension or internal pressure. (Author)