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Modal acoustic emission analysis of mode-I and mode-II fracture of adhesively-bonded joints.

Crawford, Alasdair R.; Droubi, Mohamad Ghazi; Faisal, Nadimul Haque

Authors

Alasdair R. Crawford

Mohamad Ghazi Droubi



Abstract

Acoustic emission (AE) testing has previously been demonstrated to be well suited to detecting failure in adhesively-bonded joints. In this work, the relationship between the fracture-mode of adhesively-bonded specimens and the acoustic wave-modes excited by their failure is investigated. AE instrumented Double-Cantilever-Beam (Mode-I fracture) and Lap-Shear (Mode-II fracture) tests are conducted on similar adhesively-bonded aluminium specimens. Linear source-location is used to identify the source-to-sensor propagation distance of each recorded hit, theoretical dispersion curves are used to identify regions of the signal corresponding to the symmetric and asymmetric wave modes, and peak wavelet-transform coefficients for the wave-modes are compared between the two fracturemodes. It is demonstrated that while both fracture-modes generate AE dominated by the asymmetric mode, the symmetric mode is generally much more significant during Mode-II fracture than Mode-I. While significant scatter and overlap in results prevents the ratio of peak-wavelet transform coefficients from being a robust single classifier for differentiation between fracture-modes in most cases, other modal analysis methods, or integration of this parameter into multi-parameter methods in future work may result in more reliable differentiation. Understanding of the wave-modes excited by the different fracture-modes also has implications for source-location, as identification of the correct modes is critical for selection of suitable wave velocities.

Citation

CRAWFORD, A.R., DROUBI, M.G. and FAISAL, N.H. 2018. Modal acoustic emission analysis of mode-I and mode-II fracture of adhesively-bonded joints. Presented at the 33rd European Working Group on Acoustic Emission (EWGAE) European acoustic emission testing conference (EWGAE 2018), 12-14 September 2018, Senlis, France [online], pages 218-228. Available from: http://www.ewgae2018.com/wp-content/uploads/2018/09/EWGAE-Conference-Proceedings_2018-1.pdf

Presentation Conference Type Conference Paper (unpublished)
Conference Name 33rd European Working Group on Acoustic Emission (EWGAE) European acoustic emission testing conference (EWGAE 2018)
Start Date Sep 12, 2018
End Date Sep 14, 2018
Deposit Date Feb 11, 2019
Publicly Available Date Feb 11, 2019
Keywords Acoustic emission; Adhesively bonded joints; Fracture mode; Defects; Non-destructive testing; Condition monitoring
Public URL http://hdl.handle.net/10059/3286
Publisher URL http://www.ewgae2018.com/wp-content/uploads/2018/09/EWGAE-Conference-Proceedings_2018-1.pdf

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