THE DAMAGE LOCALIZATION FOR PLATE STRUCTURES BASED ON MODIFIED MODAL STRAIN ENERGY INDEX

In order to deal with the "vicinity efiect" in the damage localization of plate structures, this paper proposes a method based on the modifled modal strain energy. Firstly, the relative strain change at adjacent points are used to calculate the weight coe-cients, Then the strain energy in the corresponding area is redistributed according to the weight coe-cients. By deflning a damage difierentiation degrees index, the influences of the noise on the damage localization can be evaluated. To verify the feasibility and the efiectiveness of the proposed method, a four edge simply supported plate is used as a numerical example. It is shown that the proposed method can realize an accurate damage localization in dot, block and strip damage cases, with a good anti-noise capability.