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Fracture in composite/aluminium joints of variable adhesive properties

Abstract

A strain gauge technique recently developed with the wedge test, for estimating crack length and, thus, the fracture energy of structural adhesive bonding, has been employed on a system in which one adherend had two types of surface treatment. Simple polishing and polishing with subsequent sandblasting were the treatments used, with a distinct straight line, perpendicular to the sample edges, separating the two. Despite the clear-cut difference in surface treatment, smooth transitions in crack growth speed were noted. This can be explained by the existence of a curved crack front, encroaching gradually on one surface-treated zone, whilst remaining partially on the other. Crack length, a, vs. time, t, curves were exploited to obtain fracture energy vs. crack speed. The multi-valued nature of the relation can also be explained by a non-rectilinear fracture front. The method is proposed as a method for reproducible comparison of surface treatments.

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Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
JOURNAL OF ADHESION no. 85, pages 736 - 754,
ISSN: 0021-8464
Language:
English
Publication year:
2009
Bibliographic description:
Budzik M., Jumel J., Imielińska K., Shanahan M.: Fracture in composite/aluminium joints of variable adhesive properties // JOURNAL OF ADHESION. -Vol. 85, nr. iss. 10 (2009), s.736-754
Verified by:
Gdańsk University of Technology

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