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Thin Walled Cylinder Buckling

A cylinder is loaded with a uniformly distributed line load along the top edge. Critical buckling load is determined. Different meshes and differences between Belytschko-Tsay shell (elform 2), S/R Hughes-Liu shell (elform 6), Belytschko-Wong-Chiang shell (elform 10) and fully integrated shell (elform 16) can be studied.
*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_BUCKLE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_SOLUTION
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_SHELL
*CONTROL_TERMINATION
*DATABASE_BINARY_D3PLOT
*DEFINE_CURVE
*ELEMENT_SHELL
*END
*HOURGLASS
*KEYWORD
*LOAD_NODE_SET
*MAT_ELASTIC
*NODE
*PART
*SECTION_SHELL
*SET_NODE_LIST_TITLE
*TITLE