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Double Cross In-Plane Vibration

Behavior of beam elements in a modal analysis. The problem requires the extraction of numerically close eigenvalues. Differences between Hughes-Liu beam (elform 1), Belytschko-Schwer beam (elform 2) and linear Timoshenko beam (elform 13) can be studied. Example 8 from Introductory Manual for LS-DYNA Users by James M. Kennedy.
*BOUNDARY_SPC_SET
*CONTROL_IMPLICIT_AUTO
*CONTROL_IMPLICIT_EIGENVALUE
*CONTROL_IMPLICIT_GENERAL
*CONTROL_IMPLICIT_SOLVER
*DATABASE_BINARY_D3PLOT
*ELEMENT_BEAM
*END
*KEYWORD
*MAT_ELASTIC
*NODE
*PART
*SECTION_BEAM
*SET_NODE_LIST
*SET_NODE_LIST_GENERATE
*TITLE