Damage detection of circular hollow cylinder using modal strain energy and scanning damage index methods

The detection of surface crack in a circular hollow cylinder is presented in this paper. Experimental modal analysis is conducted on the cylinder to obtain the modal displacements used to compute the modal strain energy. For all measured mode shapes, a damage index is defined by using the ratio of m...

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Bibliographic Details
Published in:Computers & structures 2011, Vol.89 (1), p.149-160
Main Authors: Hu, Huiwen, Wu, Chengbo, Lu, Wei-Jun
Format: Article
Language:English
Subjects:
Circular hollow cylinder
Cylinders
Damage
Damage detection
Energy use
Exact sciences and technology
Experimental modal analysis
Fracture mechanics (crack, fatigue, damage...)
Fundamental areas of phenomenology (including applications)
Measurement and testing methods
Modal strain energy
Physics
Scanning
Scanning damage index
Solid mechanics
Static elasticity (thermoelasticity...)
Strain
Structural and continuum mechanics
Surface crack
Surface cracks
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:The detection of surface crack in a circular hollow cylinder is presented in this paper. Experimental modal analysis is conducted on the cylinder to obtain the modal displacements used to compute the modal strain energy. For all measured mode shapes, a damage index is defined by using the ratio of modal strain energies of cylinder before and after damage. A scanning damage index is developed by moving damage indices obtained from the local area throughout the structure. The summation of damage indices in overlap areas may intensify the signals of damage in the cylinder.
ISSN:0045-7949
1879-2243
DOI:10.1016/j.compstruc.2010.08.011