Abstract
Stiffened plates are employed in various engineering structures including aerospace, civil, naval, etc. These structures may be subjected to harmonic loads. Therefore, it is essential to understand the harmonic response of a cracked stiffened structure. This study presents the effects of the crack location on the free vibration and harmonic response of the stiffened plates. For this purpose, horizontal and vertical cracks are modelled throughout the fixed from two-side structure. The analyses are performed via the Finite Element Method and the Mode Superposition technique. The natural frequencies and the displacement responses of the cracked and healthy structures are obtained and interpreted. It is concluded that a horizontal crack can decrease the third natural frequency by 60% as it is located in the center of the stiffened plate that is fixed from its non-stiffened edges. Thus, the displacement response of the stiffened structures is increased by 18% in the presence of the side horizontal or vertical cracks, which are located at the free ends of the stiffened structures no matter which boundary condition is considered.
Highlights
Harmonic response analysis is an essential task to be performed during the designing phase of an engineering structure to understand the dynamic behavior of a structure in the presence of the harmonic load
This study presents the effects of crack direction, location, and length on the free vibration and harmonic response of the stiffened plates under fixed from stiffened edges and fixed from non-stiffened edges boundary conditions
It is concluded that the horizontal plate cracks on the stiffened structure, fixed from non-stiffened edges, it is seen from the results that a horizontal crack located at the center of the structure has affected the third natural frequency of the structure by 60%
Summary
Harmonic response analysis is an essential task to be performed during the designing phase of an engineering structure to understand the dynamic behavior of a structure in the presence of the harmonic load. Such a load may produce excessive vibrations on the structures that may generate stress, displacement, and noise at a high level, which is produced by excessive and frequent oscillations. Due to all aspects mentioned above, researchers have studied the vibrational characteristics of engineering structures in various ways Some of those works have been briefly presented as follows
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