Abstract: The vibration behavior of cracked plates is investigated. The stress intensity factors (SIF) of a finite plate with a thorough crack under bending, twisting, and shearing are estimated at first, The element stiffness matrix of the plate with crack is derived from an integration of SIF. A finite element model(FEM)of cracked plate is established consequently. By applying the FEM to a simply supported square plate with a center through crack, the eigenfrequencies are determined for different crack lengths. The results in this paper show a good agreement with those by the previous investigators. The suggested FEM for cracked plate provides a more efficitent computation technique for vibration analysis of structures with crack.

Key words: crack, plate, vibration, strength intensity facter, finite element method