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PREDICTIONS OF THE COLLAPSE STRENGTH OF THREE HY-100 STEEL SPHERICAL HULLS FABRICATED FOR THE OCEANOGRAPHIC RESEARCH VEHICLE ALVIN.
DAVID TAYLOR MODEL BASIN WASHINGTON D C
Out-of-roundness measurements were taken on three spherical pressure hulls which have been fabricated for ALVIN, a two-man oceanographic vehicle designed for an operating depth of 6000 ft. The results of these measurements indicated that over a critical arc length, the maximum ratio of local radius to nominal radius was 1.05. The collapse strength of the three hulls was evaluated by means of a recently developed analysis which utilizes local geometry as determined by out-of-roundness measurements. Based on critical local geometry and available stress-strain curves, the analysis indicated that the collapse depths of the hulls ranged from approximately 15,000 to 16,000 ft. A high degree of confidence is placed in the results, and the importance of accurately measuring the shape of spherical shells is emphasized. Author