Damage Detection in Plate Using Gradient Search Sensitivity Method of Fe Model Updating

Abstract eng:
Damage Detection in the structure is an active research area since decades. Number of the research studies has been done to meet this objective, particularly, the identification of the damage size and location. The finite element (FE) updating methods have also been used in the literature for the damage size and location identification. However, most of the studies are generally related to the beam type structures with the crack/damage. This concept has now been extended to the plate type structure with damage. Here again, the modal properties (natural frequencies and mode shapes) of the damaged plate have been used to estimate the damage size assuming the location of the damage was known. In the present study, the damage in the plate has been simulated in the FE model of the plate by the reduction in the plate thickness in the small portion of the plate and then the thickness of the plate has been chosen as the updating parameter. The Gradient Search based Sensitivity Model Updating method has then been applied to calculate the plate thickness for the damaged area from the FE model of the healthy plate (without damage). The proposed method has been examined on a simple simulated example of a steel plate. The paper presents the proposed method and the result from a simulated example.

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