Because of a substantial increase in the blow pressure now available for recovery from a casualty condition, the structure of submarine main ballast tanks may be taxed to perform well into the inelastic range, thus becoming one of the highest-performance structures in a modern submarine. Thus, ballast tanks must be designed accurately, with careful attention to uniformity of stress distribution and to avoidance of any detail which might initiate tearing.nBy application of the equations contained herein, and appropriate design margins of safety, it is now possible to insure that the ballast tank structure is "strong enough to take that immediate application of pressure.
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