MWCNTs toward superior strength of epoxy adhesive joint on mild steel adherent

In this work, the characteristics of the lap shear joints of MWCNT-epoxy adhesive on mild steel adherend are investigated. In this paper, multiwall carbon nanotubes (MWCNTs) are homogeneously and cluster-freely reinforced in epoxy matrix by simultaneously applying ultrasonic waves and an axial flow...

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Bibliographic Details
Published inComposites. Part B, Engineering Vol. 143; pp. 207 - 216
Main Authors Kumar, Arun, Kumar, Kaushal, Ghosh, P.K., Rathi, Ankit, Yadav, K.L., Raman
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.06.2018
Subjects
Adhesive joints
Epoxy resin
Lap shear strength
MWCNTs
Epoxy resin
Adhesive joints
Lap shear strength
MWCNTs
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Summary:In this work, the characteristics of the lap shear joints of MWCNT-epoxy adhesive on mild steel adherend are investigated. In this paper, multiwall carbon nanotubes (MWCNTs) are homogeneously and cluster-freely reinforced in epoxy matrix by simultaneously applying ultrasonic waves and an axial flow impeller on epoxy resin to develop toughened epoxy adhesives. Here, we describe details pertaining to mild steel surface morphology, the bond line thickness of the adhesive, the wettability of MWCNT-epoxy resin on the mild steel surface and the impact of the presence of MWCNTs in epoxy resin on the performance of lap shear joints. The experimental observations indicate that the reinforcement of MWCNTs in epoxy with uniform cluster-free dispersion and a change in the morphology of the mild steel adherend significantly improve the strength of lap shear joints and change their failure mode. The inclusion of 0.75 wt% of MWCNTs in epoxy adhesive resulted in the largest enhancement in the lap shear strength and as the weight percentage of MWCNTs increased from 0.75 wt%, the lap shear strength began to degrade. [Display omitted] •MWCNTs were homogeneously and cluster freely reinforced in epoxy matrix.•The strength of adhesive joints depends on surface characteristic of adherend and bond line thickness of adhesive.•MWCNTs in epoxy adhesive significantly enhanced the lap shear strength and toughness of adhesive joints.•The presences of clusters of MWCNTs act as defect in epoxy adhesive and degrades the strength of joints.
ISSN:1359-8368
1879-1069
DOI:10.1016/j.compositesb.2018.01.016