The paper aims to study the dynamic behavior of a bending thin plate with fixed-fixed ends after crack occurrence. Using the FEM with an 8-node quadrilateral isoparametric element based on the Ressner-Mindlin’ theory of plate, the program CRACK-PLATE is developed to investigate the effect of crack length and position on the dynamic response of plate. The natural frequencies and modes are calculated and analyzed numerically for the non-faulty case and additionally with the edge and the central crack. In order to achieve a high accuracy, a singularity element of Barsoum is combined. The numerical results show that the natural frequencies are very sensitive to the crack presence in bending plate. It provides a basis to carry out the inverse problem for crack identification based on the dynamic characteristics of plates.

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