HYDROSTATIC TESTS OF A HIGH STRENGTH STEEL INTERNALLY STIFFENED HEMISPHERE
Research and development rept.
DAVID TAYLOR MODEL BASIN WASHINGTON DC STRUCTURAL MECHANICS LAB
Pagination or Media Count:
A stiffened steel hemisphere with a nominal yield strength of 150,000 psi was designed, fabricated, and tested to explore the structural efficiency of stiffened spherical shells. Test results show that the collapse pressure was approximately 30 percent greater than that predicted for an unstress-relieved, monocoque shell of equivalent weight with the same out of roundness. The collapse pressure approached that of a near-perfect, machined spherical shell. Thus, it appears that the detrimental effects of initial imperfections and residual stresses arising from fabrication processes for monocoque spherical shells may be at least partially overcome through use of properly designed stiffening systems. Based on the test results, it is estimated that an HY-150 stiffened steel spherical shell designed for a collapse depth of 10,000 ft would weigh 43 percent of its displacement.
- Submarine Engineering
- Structural Engineering and Building Technology