Eventos Anais de eventos
COBEM 2017
24th ABCM International Congress of Mechanical Engineering
Vibrational Analysis of Cracked Hooks
Submission Author:
Emilio Janssen , PR , Brazil
Co-Authors:
Eduardo Farinazzo , Marcus Oliveira Filho, Emilio Janssen
Presenter: Emilio Janssen
doi://10.26678/ABCM.COBEM2017.COB17-0564
Abstract
It is well known that the presence of cracks modifies the dynamic responses of structures. Also, the use of hooks is one of the preferred methods for load lifting and handling, and several failures and accidents involving crack propagation in this equipment have been reported. Although predictive and prognostic maintenances of hooks are desired for industrial applications, the study of vibrational behavior of cracked hooks is still incipient. In the present work, a tridimensional model of a hook was made computationally through the finite element method. In this model, cracks with different depth and positions were inserted in the higher stress concentration site. The different simulated scenario allowed the study of the damage influence over the hook’s natural frequencies and mode shapes. It was found that some vibrational modes are more sensitive to the damage than others: the fourth natural frequency and mode shape were the most affected, followed by the fifth and sixth ones. Based on the results found, a method for crack identification based on the natural frequencies and mode shape shifts detected in damaged hooks can be developed.
Keywords
modal analysis, crack, natural frequency, Mode shape
