Abstract
The paper presents a method to detect cracks with a complex shape in semi-finished casting products, which bases on the vibration response of the tested element. Firstly, we contrived relative frequency shift curves for beams subjected to L and T shaped cracks by means of the finite element method. The curves were plotted for numerous crack positions along the test specimen and used to contrived crack patterns, which consist of a set of frequency shifts for several weak-axis out-of-plain modes. The patterns are collected in a database and are used as a benchmark in the damage detection process. At the end of the paper, we demonstrate through an experiment how a visual method can be used in an automated damage detection procedure to identify a crack with a complex shape.
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