Multiple Crack Detection in Structures Using Residual Operational Deflection Shape

Fatigue cracks are one of the common defects in structures which are vital to be detected as a part of structural health monitoring systems. It has recently been shown that a simplified method called the residual operational deflection shape (R-ODS) is capable of detecting single fatigue crack in beam-like structures. The method is based on the ODSs at exciting frequency and its higher harmonic components which consider both amplitude and phase information of responses to map the deflection pattern of structures. In this paper, the R-ODS method is extended further to beams with multiple cracks. Details of the method and its application for detection of multiple cracks through numerical and experimental examples are presented.

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