NACA-ARR-L6A05

Abstract

<strong>INTRODUCTION</strong> <br>Because the skin of an airplane in flight is subjected to combinations of stress, attention has been given to the problem of bucking of plates when more than one stress is present. Important cases of such buckling, involving the interacting of shear and one direct stress, have already been studied. In the present paper elastic buckling under the interaction of longitudinal and transverse is considered. <br>A combination of two direct stresses can arise in a plate if the Poisson effect produced by the application of one direct stress is restrained or partially restrained by members adjacent to the plate. If the individual Stresses can be evaluated, the effect of the combination should be considered in investigating the stability of the plate. <br>The energy method is used to derive interaction equations that define the critical combinations of longitudinal and transverse derect stress for isotropic flat rectangular plates. <br>The solution obtained for case (a) is exact.For the other three cases the solutions obtained are approximate and, as is characteristic of the energy method, unconservative. Comparisons with know exact solutions and lower-limit solutions indicate, however, that the errors in the present results are generally small.