Non destructive damage severity estimation in beam using change in extended cross modal strain energy

Nacim, Mellel; Mohammed, Ouali; Mourad, Dougdag; Brahim, Mohammedi

doi:10.22061/jcarme.2020.6854.1881

Document Type : Research Paper

Authors

¹ Structures Research Laboratory, Engineering Faculty, Saad Dahlab University, Blida, Algeria

² Nuclear Research Center of Birine, BP 180, Ain Oussera, Djelfa, Algeria

10.22061/jcarme.2020.6854.1881

Abstract

This paper presents an extended cross modal strain energy change method to estimate the severity of damage associated with limited modal data in beam-like structures. This method takes in account the correlation between the analytical modal data and the measured incomplete modal data. A procedure was proposed and the analytical elemental stiffness of the damaged element after it is localized is included in quantification of the measured single damage extent. A three-dimensional numerical beam model with different damage cases is used to simulate the CMSE method application and to getting the bending displacements of the damaged element. An experimental modal analysis on a cantilever beam subjected to a controlled crack levels was carried out to demonstrate the effectiveness of the extended CMSE method. The severity magnitude of the damage was predicted within an acceptable error range through the using validation process. Analysis results demonstrate that the presented damage method effectively quantifies single damage severity in beam like structure and can be applied in engineering practice.

Graphical Abstract

Keywords

Main Subjects

Vibration

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