The goal of this study is to investigate the effects of fillet radius and crack depth on the dynamic response. To achieve this aim, finite element analysis was used to simulate the intact and damaged beams. The wavelet transforms (WT) function is employed to achieve the detection process, including the effect of crack depth and radius of crack edge fillet. However, WT shows a fluctuation indicator, which means a low accuracy with noisy data. Improving WT by calculating the square value of WT slope provides an excellent index in view of detecting and quantifying the starter cracks. The results confirm the WT index amplitude and its derivative increased in all models with increasing the crack depth increased. Therefore, the effectiveness of the modal analysis combined with statistic calculation in crack detection that there is no different significance between the current study and previous study using simulation and theoretical study. The proposed method works well with numerical simulation. Hence, the modal analysis can be recommended as an effective approach to detecting open-cracks.
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