Accession Number : AD0035164


Title :   AN INVESTIGATION OF A METHOD FOR PRESTRESSING FLAT PLATES TO INCREASE THEIR BUCKLING STRENGTH


Corporate Author : NEW YORK UNIV BRONX SCHOOL OF ENGINEERING AND SCIENCE


Personal Author(s) : Wang, C T ; Ross, A L ; Reiss, E L


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/035164.pdf


Report Date : Feb 1954


Pagination or Media Count : 203


Abstract : It is proposed that flat plates can have their buckling strength increased by prestressing. The prestressing is accomplished by first cold rolling the plates into cylindrical form and then opening the plate by riveting onto or clamping into a flat frame. This prestressing will produce membrane stresses in the plane of the plate of such a magnitude and distribution as to raise its buckling load in the direction of the generator of the cylinder. The present investigation was restricted to the case of all four sides clamped. The stresses produced by this process are measured and their effect calculated by the Rayleigh-Ritz method. The analysis shows that small stresses (1000 psi maximum) could raise the buckling load almost 50%, and probably more. These stresses would also change the buckling mode in some of the cases examined from antisymmetrical to symmetrical modes. A testing frame was constructed to produce, and measure the effect of the proposed prestressing. The tests showed that the buckling load was raised in some cases over l0O% while the average for all tests was 38%. A theoretical evaluation of the membrane stresses and their effect was carried out which involved the solution of the non-linear plate equations of Von Karman. Because the necessity of using the rather approximate assumptions, the analysis could be subjected to questioning. Nevertheless, the analysis showed that the buckling load at one particular type of prestressed plate would be raised approximately 15%.


Descriptors :   *SHEETS , *BUCKLING , STRESSES , MECHANICAL PROPERTIES , MATHEMATICAL ANALYSIS


Subject Categories : Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE