Vibration analysis of cantilever beam with multiple cracks using natural frequency as basic criterion

Beam type structures are being commonly used in steel construction and machinery industries, in structures and machines, and fatigue cracks are the main cause of beams failure. Crack occurs in beams to change its dynamic behaviour of structure and examining these changes in crack location and crack size are identified. The NDT methods are used for crack detection and which are costly and time consuming. In this paper the beam consider to open transverse cracks. Currently research has focused on using modal parameters i.e. natural frequency used as a basic criterion. In this paper the modal analysis was performed on cracked beams and a healthy beam, to calculate natural frequency. The first three natural frequencies wear considered for vibration analysis of beams. The vibration analysis result to shows the plot the effect of the second crack on the natural frequency and mode frequency ratio in terms of crack depth for various crack positions of the cantilever bar.