Previous work is reviewed, emphasis being given to the results of a photoelastic investigation of a series of hole arrays in thick plates subjected to uniaxial loading. The design of the tested arrays and their relationship to the principal features of a square array of penetrations in a part-spherical pressure vessel end are explained. Stress indices resulting from equi-biaxial loading in normal arrays (obliquity angle zero) and oblique arrays (obliquity angle of 45°) are obtained from the uniaxial data by superposition. Results for holes at the array boundaries and remote from the boundaries are presented and critically discussed.
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