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Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints.

Droubi, Mohamad Ghazi; Stuart, Alan; Mowat, John; Noble, Craig; Prathuru, Anil Kumar; Faisal, Nadimul Haque

Authors

Mohamad Ghazi Droubi

Alan Stuart

John Mowat

Craig Noble

Anil Kumar Prathuru

Nadimul Haque Faisal

Abstract

Failure behaviour of two types of adhesively bonded joints (composite-to-metal, metal-to-metal) has been studied under failure modes (Mode I: double cantilever beam (DCB) and Mode II: three-point end notch flexures (3-ENF)) using acoustic emission (AE) technique. The bonded specimens were prepared using two types of adhesive bond materials with three variations of adhesive bond quality. The effect of the presence of interfacial defects along the interface on the residual strength of the joint has also been studied. It was possible using the maximum AE amplitude method to select the AE events of mechanical significance. However, it proved difficult to propose a definitive AE trait for the mechanical phenomena occurring within specific AE event signals, for all adhesive types, bond qualities, and substrate configurations; therefore, all specimen combinations. There was a notable shift in spectral energy proportion as the AE source of mechanical significance varied along the specimen length for specimen combinations. However, it was difficult to confirm this distinctive trait for all specimen combinations due to difficulty in confirming the location and exact mechanical source. The proposed measurement technique can be useful to assess the overall structural health of a bonded system and may allow identification of defects.

Journal Article Type Article
Publication Date May 31, 2018
Journal Journal of adhesion
Print ISSN 0021-8464
Electronic ISSN 1545-5823
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 94
Issue 5
Pages 347-386
Institution Citation DROUBI, M.G., STUART, A., MOWAT, J., NOBLE, C., PRATHURU, A.K. and FAISAL, N.H. 2017. Acoustic emission method to study fracture (Mode-I, II) and residual strength characteristics in composite-to-metal and metal-to-metal adhesively bonded joints. Journal of adhesion [online], 94(5), pages 347-386. Available from: https://doi.org/10.1080/00218464.2017.1278696
DOI https://doi.org/10.1080/00218464.2017.1278696
Keywords Adhesive materials; Destructive testing; Fracture mechanics; Failure modes; Interfacial fracture; Acoustic emission; Residual strength

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