Abstract
The aim of crack detection and localization is to minimize sudden failures of rotating machines and static structures while in operation. For this purpose, an impact hammer test is performed in cracked and no crack beams made of steel and composite material to obtain the change in natural frequencies and mode shapes. The impact hammer test is performed with the help of four-channel vibration analyzer, impact hammer and uniaxial accelerometer. A change in natural frequencies is used to detect the crack present in the steel and composite beams. Test data of first three natural frequencies obtained from an impact hammer test on different cracked steel and composite beams are used to train the normalized mode shapes algorithm and plot the mode shapes of first three natural frequencies. The intersection of first three normalized mode shapes is used to estimate the crack location with very high accuracy. From the experimental results, it is confirmed that the change in natural frequencies and intersection of first three normalized mode shapes are used for detection and localization of crack present in the steel and composite beams, respectively. When compared to other methods in the literature for detecting crack location based on mode shape curvature, the methodology used in this paper is more accurate.
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Ramakrishna, S., Sathish, J., Raj Kumar, V.D. et al. Experimental Investigation on Crack Localization in Steel and Composite Structures by Intersection of First Three Normalized Mode Shape Curves. J Fail. Anal. and Preven. 22, 1970–1981 (2022). https://doi.org/10.1007/s11668-022-01486-7
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DOI: https://doi.org/10.1007/s11668-022-01486-7