Accession Number : AD0015517


Title :   TESTS OF THE ELASTIC STABILITY OF A RING-STIFFENED CYLINDRICAL SHELL, MODEL BR-5 (LAMBDA= 1.705), SUBJECTED TO HYDROSTATIC PRESSURE


Corporate Author : DAVID TAYLOR MODEL BASIN WASHINGTON DC


Personal Author(s) : Slankard, Robert C ; Nash, William A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/015517.pdf


Report Date : May 1953


Pagination or Media Count : 40


Abstract : Descriptions are given of the test model, apparatus, and procedure. A study of the circularity plot at each station indicated (1) a fairly uniform inward radial displacement around the periphery of the model at each ring, and (2) radial displacements which were exaggerations of the initial no-load contours for those stations located midway between rings in the 4 equal bays of the model. The lobes in adjacent bays were staggered; virtually no rotation of the generator occurred at the 2 frames bounding a lobe. This mode of deformation differed from the von Mises assumption of no rotational restraint at the edge of a finite cylinder but was in agreement with 1 of the analyses of Salerno and Levine (PIBAL report 182, 1951). The von Mises theory yielded a minimum value of 123 psi for a buckled configuration of 16 lobes; the experimentally determined buckling pressure for model BR-5 was 80 psi with a buckled configuration of 14 lobes. Permanent set was evident in the regions of the first 3 lobes in the model after removal of the 80-psi pressure. The deviation of the experimental from the theoretical results was attributed to initial out-of-roundness and residual welding stresses.


Descriptors :   *HYDROSTATIC PRESSURE , *ELASTIC PROPERTIES , *RING STIFFENED CYLINDERS , MODEL TESTS , BUCKLING , RESTRAINT , WELDING , DISPLACEMENT , DEFORMATION , STABILITY , RESIDUAL STRESS


Subject Categories : Marine Engineering


Distribution Statement : APPROVED FOR PUBLIC RELEASE