Wave Propagation Based Multi-Crack Identification in Beam Structures through Anti-Resonances Information

Dan Sheng Wang; Hong Ping Zhu

doi:10.4028/www.scientific.net/KEM.293-294.557

Paper Titles

Application of Statistical Energy Analysis for Damage Detection in Spacecraft Structures
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A Combined Finite and Spectral Element Approach to Wave Scattering in a Cracked Beam: Modelling and Validation
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Tracking of Cracks in Airplane Components Using Nonlinear Surface Wave Propagation Techniques
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Wave Propagation Based Multi-Crack Identification in Beam Structures through Anti-Resonances Information
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Damage Detection in Circular Cylindrical Shells by Frequency Sensitivities and Mode Shapes
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Health Monitoring: New Techniques Based on Vibrations Measurements and Identification Algorithms on an Aeronautical Composite Panel
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Predicting Failure in Multi-Bolt Composite Joints Using Finite Element Analysis and Bearing-Bypass Diagrams
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HomeKey Engineering MaterialsKey Engineering Materials Vols. 293-294Wave Propagation Based Multi-Crack Identification...

Wave Propagation Based Multi-Crack Identification in Beam Structures through Anti-Resonances Information

Abstract:

Cracks bring a serious threat to safety of structures. Most of the failures and fractures of engineering structures are due to initial cracks or fatigue cracks of materials. So it is very important to analyze the vibration characteristics and to identify the damage of cracked structures. A method for multi-crack identification based on wave propagation is proposed in this paper, which makes use of the driving-point mechanical impedance characteristics of the cracked beams stimulated by harmonic force. The proposed identification method is used to characterize the local discontinuity due to cracks, and a simplified rotational spring model is introduced to model cracks. Subsequently, the proposed method is verified by a numerical example of a simply supported steel beam with three cracks. The effect of crack depth on driving-point impedance is investigated. Combined with the first anti-resonances information, the proposed method can identify the presence of cracks, localize the multiple cracks, and qualitatively identify the extent of the crack damages.

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Periodical:

Key Engineering Materials (Volumes 293-294)

Pages:

557-564

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.293-294.557

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Online since:

September 2005

Authors:

Dan Sheng Wang, Hong Ping Zhu

Keywords:

Anti-Resonance, Crack Identification, Rotational Spring Model, Wave Propagation

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