Enhancing strength and toughness of adhesive joints via micro-structured mechanical interlocking

Hamilton, A., Xu, Y. , Kartal, M. E., Gadegaard, N. and Mulvihill, D. M. (2021) Enhancing strength and toughness of adhesive joints via micro-structured mechanical interlocking. International Journal of Adhesion and Adhesives, 105, 102775. (doi: 10.1016/j.ijadhadh.2020.102775)

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The potential to improve the mechanical properties of adhesive joints via micro-structured interlocking features is investigated. The micro-structured surfaces were fabricated in polycarbonate via injection moulding from a master template. The specimens were then bonded in an interlocking configuration to form single lap joints and tested to failure in tension. Planar untreated (i.e. un-abraded) and planar roughened (i.e. abraded) samples were also tested to provide benchmarks. Compared to the planar roughened case, results show that micro-structuring the interface can yield up to a 95.9% increase in strength and up to 162% increase in work to failure. Increases in strength and work to failure beyond the planar roughened level are attributed to mechanical interlocking of features. As deformation proceeds, progressive bending of each pair of interlocking features develops an increasing resistive load which allows the total load to significantly exceed that of the planar roughened case. Work to failure is increased via a combination of increased maximum force, increased displacement enabled by microfeature bending and a more torturous crack path. Low clearances between interlocking features were found to be favourable for mechanical properties owing to reduced bending stiffness of the repeating periodic unit at the interface.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Hamilton, Mr Alexander and Mulvihill, Dr Daniel and Xu, Dr Yang and Gadegaard, Professor Nikolaj
Authors: Hamilton, A., Xu, Y., Kartal, M. E., Gadegaard, N., and Mulvihill, D. M.
College/School:College of Science and Engineering > School of Engineering > Biomedical Engineering
College of Science and Engineering > School of Engineering > Systems Power and Energy
Journal Name:International Journal of Adhesion and Adhesives
ISSN (Online):1879-0127
Published Online:13 November 2020
Copyright Holders:Copyright © 2020 Elsevier Ltd.
First Published:First published in International Journal of Adhesion and Adhesives 105:102775
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
302858Fundamental Mechanical Behaviour of Nano and Micro Structured InterfacesDaniel MulvihillLeverhulme Trust (LEVERHUL)RPG-2017-353ENG - Systems Power & Energy
172865EPSRC DTP 16/17 and 17/18Tania GalabovaEngineering and Physical Sciences Research Council (EPSRC)EP/N509668/1Research and Innovation Services