STRENGTH TESTS OF SUBMARINE RESCUE CHAMBER,
Abstract
A one-fifth scale model of a diving bell for submarine rescue work was built and tested. Design called for the bell to withstand the external pressure encountered at a depth of at least 300 feet of water, and the test showed that the model fulfilled this requirement with a factor of safety of about 3.5. The vessel was tested under external pressure, failure occurring in the shell at a pressure of 470 lbs. per sq. in. Since the head of the vessel remained intact, it was decided to make a test of the head itself in order to determine its strength relative to that of the shell, and if possible to obtain some measure of the stresses occurring under load. The head collapsed at a pressure of 525 lbs. per sq. in., indicating that its strength under external pressure was about 10% in excess of that of the shell. In comparing the measured strains with the theory it was found that the older formulas in which the effect of bending is neglected were inadequate to account for either the distribution or the magnitude of the stresses indicated by the strain measurements, while the newer bending stress theory showed very good agreement. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1931
- Accession Number
- AD0652322
Entities
People
- F. G. Ebel