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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.