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C. Adam:
"Moderately large flexural vibrations of layered panels with initial imperfections";
in: "CD-ROM Proceedings of the 13th International Congress on Sound and Vibration (ICSV13)", J. Eberhardsteiner, H.A. Mang, H. Waubke (ed.); Vienna University of Technology, 2006, ISBN: 3950155457, Paper ID 342, 8 pages.

Nonlinear flexural vibrations of doubly curved layered panels composed of three thick and with respect to the middle surface layers symmetrically arranged layers are analyzed. The panels are of polygonal planform and hard hinged simply supported with the edges fully restraint against displacements. The governing equations are derived by application of a first order shear deformation theory, and nonlinear structural behavior is considered by a modified Berger theory. Numerical results of rectangular panels with initial imperfections in nonlinear steady state vibration exhibit layerwise different cross-sectional rotations as main dynamic effect.

http://aleph.ub.tuwien.ac.at/F?base=tuw01&func=find-c&ccl_term=AC06585583