Condition monitoring of defective single lap adhesive joint using carbon nanotubes

Document Type : Research Article

Authors

1 PhD, School of Mechanical Engineering, College on Engineering, University of Tehran, Tehran, Iran.

2 Associate professor, School of mechanical engineering, College of engineering, University of Tehran, Tehran, Iran.

Abstract

Adhesive joints have been employing in engineering structures such as marine, aerospace, automotive, oil, and gas industry. Since the joints are the weakest part of engineering structures, the fracture possibility in the adhesive joint is high. Therefore, structural health monitoring of adhesive joint is an important issue. The aim of this paper was condition monitoring of damage in the single lap adhesive joint by multiwall carbon nanotubes. This work is carried out by recording the electrical resistance change during the mechanical loading. This damage propagation is observed as a crack extension in the adhesive joint. Firstly, carbon nanotubes with 9 wt.% are dispersed in an epoxy resin by an ultrasonic device. Then, the hardener is added to the nono-adhesive. The obtained material is immediately poured into a single lap adhesive joint mold. The defective adhesive joints were manufactured with circular and square defects in different sizes i.e. 10%, 30%, and 70% overlap area. The specimen is subjected to a tensile test and electrical resistance changes are recorded during the shear load. The results showed that the maximum value of relative resistance change is occurring in the adhesive joint comprises of square defect with 30% overlap area of defect. In this situation, the crack was propagated in nano-adhesive and a small part of a crack was extended from the defect boundary.

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Main Subjects

References

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Amirkabir Journal of Mechanical Engineering
Volume 53, Issue 2 (Special Issue)
May 2021
Pages 1321-1330

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