LOAD DIFFUSION ANALYSIS OF SURFACE VESSELS.
Final technical rept.,
ALLIED RESEARCH ASSOCIATES INC CONCORD MASS
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Computations were conducted to determine the effect of load diffusion on the stresses in a ship with a long cutout on each side, beginning with the distribution of bottom pressures. The analysis reveals that in the center region of the vessel under investigation each cross section was nearly fully effective in bending. The effect of load diffusion was found to modify the elementary beam stresses by about 10 to 25 per cent in the region of maximum moment. Computations of stresses in I-beams and angle frames showed that, for the proportions of ship structures, a reasonably reliable analysis could be conducted on the assumption that all members were uniform thickness plates. A fundamental constraint, in the conduct of the calculations, was the need for performing the analysis with a calculator no more advanced than a desk computer in order to test the general utility of the load diffusion procedure. It was intended that this could function for use in a design room if it were found to be resasonably reliable and simple to use. A significant decrease in calculation effort could be achieved after some experience in the selection of initial values for the iteration process employed in the investigation. Further advantage could be realized by judicious use of a high speed digital computer. Author
- Marine Engineering