Mechanical Effects of Welding (Eds. L.Karlsson, L.E.Lindgren, M.Jonsson),
pp. 239-259, 1992


THE INFLUENCE OF WELDING STRESSES AND DISTORTIONS
ON THE STABILITY OF SHELLS OF REVOLUTION

F.G. Rammerstorfer, I.C. Skrna-Jakl and M. Zelezny

Institute of Lightweight Structures and Aerospace Engineering,
TU Wien, Vienna, Austria


Abstract - This paper deals with the computation of the elastic and elastoplastic stability of welded shells (cylindrical and spherical shells) under mechanical or thermal loading. It is assumed that the residual welding stresses and welding distortions are either known or can be predicted by numerical methods or analytical approximations. The determination of the bifurcation or limit points is performed by numerical discretization methods using finite element or finite difference methods. The influence of welding stresses is simulated either directly by initial stresses introduced into the governing equations or by a fictitious temerature field which leads to a thermal stress field similar to the residual welding stress field. Welding distortions are treated as geometrical imperfections. Specific emphasis lies on circular cylindrical shells with circumferential butt welds. Some fundamental considerations regarding buckling due to fictitious or reals thermal loads are presented.


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