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

Alexander Hamilton; Yang  Xu; Mehmet Kartal; Nikolaj Gadegaard; Daniel M Mulvihill

doi:10.1016/j.ijadhadh.2020.102775

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

Alexander Hamilton, Yang Xu^* (Corresponding Author), Mehmet Kartal, Nikolaj Gadegaard, Daniel M Mulvihill^* (Corresponding Author)

^*Corresponding author for this work

Engineering

University of Glasgow

Research output: Contribution to journal › Article › peer-review

19 Citations (Scopus)

5 Downloads (Pure)

Abstract

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. unabraded) 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.

Original language	English
Article number	102775
Number of pages	10
Journal	International Journal of Adhesion and Adhesives
Volume	105
Early online date	13 Nov 2020
DOIs	https://doi.org/10.1016/j.ijadhadh.2020.102775
Publication status	Published - 1 Mar 2021

Bibliographical note

Acknowledgements:
The authors would like to acknowledge the support of the Leverhulme Trust for supporting the work under project grant “Fundamental Mechanical Behaviour of Nano and Micro Structured Interfaces” (RPG-2017-353) and the EPSRC for providing an EPSRC-DTG PhD studentship (EP/N509668/1) for the first author. Personnel at the James Watt Nanofabrication Centre (JWNC) at the University of Glasgow are also thanked for their invaluable technical support.

Keywords

adhesion
micro-structured surface
surface texturing
mechanical interlocking
lap joint
Strength
toughness

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Cite this

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abstract = "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. unabraded) 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 offeatures. 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.",

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author = "Alexander Hamilton and Yang Xu and Mehmet Kartal and Nikolaj Gadegaard and Mulvihill, {Daniel M}",

note = "Acknowledgements: The authors would like to acknowledge the support of the Leverhulme Trust for supporting the work under project grant “Fundamental Mechanical Behaviour of Nano and Micro Structured Interfaces” (RPG-2017-353) and the EPSRC for providing an EPSRC-DTG PhD studentship (EP/N509668/1) for the first author. Personnel at the James Watt Nanofabrication Centre (JWNC) at the University of Glasgow are also thanked for their invaluable technical support.",

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AB - 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. unabraded) 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 offeatures. 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.

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

Abstract

Bibliographical note

Keywords

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