Paper Titles
In-Situ Load Testing: A Theoretical Procedure to Design a Diagnostic Cyclic Load Test on a Reinforced Concrete Two-Way Slab Floor System
p.165
System Fatigue Damage Reliability Assessment of Railway Riveted Bridges
p.173
Fatigue Behavior of RC Slab Retrofitted with Carbon Fiber Mesh after Different Levels of Pre-Damage
p.179
Assessing the Feasibility of Monitoring the Condition of Historic Tapestries Using Engineering Techniques
p.187
Damage Assessment of Beams Using Flexural Wave Reflection Coefficients
p.193
Damage Assessment of Nanostructures
p.199
Damage Detection in an Aluminium Plate with an Active Constrained Layer Damping Treatment
p.205
An Investigation on Damage Detection in Aircrafts Panels Using Nonlinear Time Series Analysis
p.213
Modal-Model Applications for Large Energetic Machines
p.221

Damage Assessment of Beams Using Flexural Wave Reflection Coefficients

Article Preview

Abstract:

The wave reflection coefficients of damage such as cracks, notches and slots in otherwise uniform beams depend on frequency and on the size of the damage. Experimental results are presented for the wave power reflection coefficients of transverse slots of various depths sawn into a number of beam specimens. These results are compared with a conventional spring model to estimate the depth of the slot. The method appears to work well for larger slot depths (greater than about 30% of the thickness of the beam) and at higher frequencies, allowing their existence to be inferred and their size to be estimated. This is due to the fact that the reflection coefficients are larger in these regimes. For smaller slots or at low frequencies, noise and experimental errors, such as miscalibration errors and ill-conditioning, become more significant.

You might also be interested in these eBooks
Damage Assessment of Structures VII View Preview

Info:

Periodical:

Key Engineering Materials (Volume 347)

Pages:

193-198

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.347.193

Citation:

Cite this paper

Online since:

September 2007

Authors:

Simon P. Shone, Brian R. Mace, Tim P. Waters

Keywords:

Damage Detection, Reflection Coefficient, Wave Scattering

Export:

RIS, BibTeX

Price:

Permissions CCC:

Request Permissions

Permissions PLS:

Request Permissions

Сopyright:

© 2007 Trans Tech Publications Ltd. All Rights Reserved

Share:

Citation:

References

[1] S.W. Doebling, C.R. Farrar, M.B. Prime and D.W. Shevitz: Los Alamos Report No. LA-13070MS, (1996).

Google Scholar

[2] W. Ostachowicz and M. Krawczuk: Journal of Sound and Vibration Vol. 150 (1991), p.191.

Google Scholar

[3] N.A. Rizos, A. Dimoragonas: Journal of Sound and Vibration Vol. 193 (1990), p.381.

Google Scholar

[4] S.P. Shone, B.R. Mace and T.P. Waters: Key Engineering Materials Vols 293-294 (2005), p.541.

Google Scholar

[5] M. Rousseau, T.P. Waters and B.R. Mace: Proc. 5th DAMAS, Southampton (2003), p.433.

Google Scholar

[6] W. Staszewski, C. Boller and G. Tomlinson: Health Monitoring of Aerospace Structures, (Wiley, 2004).

Google Scholar

[7] P. Cawley and D. Alleyne: Trans. Ultrasonics, Ferroelectrics and Frequency Control, No. 39, p.381.

Google Scholar

[8] H. Tada, P.C. Paris and G.R. Irwin: The Stress Analysis of Cracks Handbook, Third Edition (American Society of Mechanical Engineers, 2000).

Google Scholar

[9] B.R. Mace and C. Halkyard: Journal of Sound and Vibration Vol. 185 (1995), p.279.

Google Scholar

[10] S.P. Shone: A flexural wave scattering method for damage detection in beams, PhD thesis, University of Southampton (2006).

Google Scholar