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The subject of this paper is the buckling behavior of thin bar stiffeners attached to plates which are subjected to normal pressure loadings. The stiffeners are mathematically modeled by a nonlinear beam theory recently derived. An analytical solution is obtained to the beam buckling equations. The curvature of the centerline along the beam's base at the buckling load is expressed in terms of the beam's thickness, height, and rotational stiffness. Analytical results are compared with an experiment recently performed.
Computerized buckling analysis of shells
Abstract : The purpose of the many examples of buckling presented here is to give the reader a physical feel for shell buckling. Section 1 contains a brief description of two kinds of buckling, collapse and bifrucation. Section 2 concerns shell structures in which the cause of failure is nonlinear collapse due to either large deflections or to both large deflections and nonlinear material behavior. Section 3 gives examples of axisymmetric shells in which failure is due to bifurcation buckling. Section 4 provides examples that illustrate the effects of boundary conditions and eccentric loading on bifurcation buckling of shells of revolution. Section 5 is devoted to combined loading of cylindrical shells and nonsymmetric loading of shells of revolution. Section 6 is on bifurcation buckling and collapse of ring-stiffened shells with emphasis given to cylindrical shells. Section 7 contains several illustrations of buckling of prismatic shells and panels, that is, structures that have a cross section that is constant in one of the coordinate directions. Section 8 focuses on the sensitivity of predicted buckling loads to initial geometrical imperfections. Section 9 demonstrates axisymmetric collapse and bifurcation buckling of bodies of revolution that consist of combinations of thin shell segments and solid segments to which shell theory cannot be applied with sufficient accuracy.
An investigation into the comparisons of the underwater shock effects on a stiffened flat plate to the predictive nature of a computer model.
Abstract : An experiment was performed to study the effects of an underwater explosion on a submerged test panel. This is a part of an on-going research project sponsored by the Defense Nuclear Agency (DNA) to help predict the dynamic responses of naval structural members due to underwater shocks. An important element of this thesis was to validate a finite element/finite central difference computer code developed to forecast shell responses. Emphasis was placed upon attaining stiffener tripping and collecting invaluable dynamic flat plate tripping data. Keywords include: Stiffener Tripping, Flat Plate Underwater Shock Response.