4-Point beam tensile test on a soft adhesive

Michal Budzik; Julien Jumel; Martin Shanahan

doi:10.1016/j.matdes.2012.10.011

4-Point beam tensile test on a soft adhesive

Abstract

An adhesive butt joint with a soft bondline has been studied. A series of experiments was conducted on test pieces constituted of aluminium adherends bonded with a low modulus epoxy adhesive, ScotchWeld™ 2216. The joint was subjected to four point bending, in tension/compression loading, under constant deflection rate, with the bondline being parallel to the applied load. The objective was to examine and evaluate crack nucleation for a range of adhesive layer thicknesses. Three criteria were used to evaluate joint efficiency. Firstly, force/stress at crack onset revealed that thinner bondlines were preferable to produce stronger and stiffer bonded structures. Secondly, fracture energy was derived, which, in the presentconfiguration, is associated with the energy stored within the adhesive layer, rather than the substrates. This is one of originalities of the test proposed. Fracture energy data lead to the conclusion, that more energy is dissipated by the joints with lower effective rigidity, viz. thicker bondlines. Finally,we applied a criterion of non-linear, 'pragmatic' work of adhesion - similar to the J-integral approach.In terms of energy consumption, the third criterion yielded (quasi) independence of the adhesive thickness. From the data collected, we conclude that for optimal joint design, rate effects must be carefullytaken into account.

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Category:: Articles
Type:: artykuł w czasopiśmie wyróżnionym w JCR
Published in:: MATERIALS & DESIGN no. 46, pages 134 - 141,
ISSN: 0264-1275
Language:: English
Publication year:: 2013
Bibliographic description:: Budzik M., Jumel J., Shanahan M.: 4-Point beam tensile test on a soft adhesive// MATERIALS & DESIGN. -Vol. 46, (2013), s.134-141
DOI:: Digital Object Identifier (open in new tab) 10.1016/j.matdes.2012.10.011
Verified by:: Gdańsk University of Technology