Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Tailoring of Thermo-Mechanical Properties of Hybrid Composite-Metal Bonded Joints

Version 1 : Received: 29 October 2020 / Approved: 30 October 2020 / Online: 30 October 2020 (14:43:01 CET)

How to cite: Khaleque, T.; Zhang, X.; Kumar Thakur, V.; Aria, A.I.; Yazdani Nezhad, H. Tailoring of Thermo-Mechanical Properties of Hybrid Composite-Metal Bonded Joints. Preprints 2020, 2020100645 (doi: 10.20944/preprints202010.0645.v1). Khaleque, T.; Zhang, X.; Kumar Thakur, V.; Aria, A.I.; Yazdani Nezhad, H. Tailoring of Thermo-Mechanical Properties of Hybrid Composite-Metal Bonded Joints. Preprints 2020, 2020100645 (doi: 10.20944/preprints202010.0645.v1).

Abstract

Metallic substrates and polymer adhesive in composite-metal joints have a relatively large coefficient of thermal expansion (CTE) mismatch, which is a barrier in the growing market of electric vehicles and their battery structures. It is reported that adding carbon nanotubes (CNTs) to the adhesive reduces the CTE of the CNT enhanced polymer adhesive multi-material system, therefore when used in adhesively bonded joints it would, theoretically, result in low CTE mismatch in the joint system. The current article presents the influence of two specific mass ratios of CNTs on the CTE of the enhanced polymer. It was observed that the addition of 1.0 wt% and 2.68 wt% of multi-walled CNTs (MWCNTs) decreased the CTE of the polymer adhesive from 7.5e-5 1/C (pristine level) to 5.87e-5 1/C and 4.43e-5 1/C, respectively by 22% and 41% reduction. The reduction in the CTE was predicted, theoretically, which showed that CTE should have been reduced to 3.6e-5 1/C (52% reduction) and 1.4e-5 1/C (81% reduction). This may be due to the fact that, Raman spectroscopy of the MWCNTs identified defects in the raw material, and scanning electron microscopy (SEM) identified agglomeration of MWCNTs on the surface and cross-section of the modified polymers.

Subject Areas

composite-metal joint; electric vehicles; carbon nanotubes; polymer adhesive; thermal strain measurement; coefficient of thermal expansion; strain mismatch

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