4.5 Article

Experimental and numerical investigation on the bond strength of self-sensing composite joints

Journal

INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
Volume 84, Issue -, Pages 227-237

Publisher

ELSEVIER SCI LTD
DOI: 10.1016/j.ijadhadh.2018.03.014

Keywords

Adhesive joint; Composite; Debonding; Cohesive zone modeling; Experimental testing; Carbon nanotube sensing layer; Fracture mode mixity

Funding

  1. Federal Highway Administration's Exploratory Advanced Research Program [DTFH61-13-H-00010]

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Laboratory experiments demonstrate that a novel carbon nanotube (CNT)-based sensing layer embedded in the bondline of an adhesively bonded structural joint can detect and monitor deformation and damage progression of the adhesive layer. In this study, experimental and numerical investigations were performed to identify any effect of an embedded CNT-based sensing layer on the bond strength of that joint. To evaluate the mechanical behavior of such a bondline configuration, two sets of single-lap specimens, with and without sensing layer, were prepared and tested to determine the bond strengths of the respective types. Two-dimensional digital image correlation (2D DIC) was utilized to estimate the load-displacement response of the test specimens. Three-dimensional cohesive surface finite element models of the test specimens, with and without the sensing layer, were created and validated using the experimental measurements. It is shown that the embedded CNT-based sensing layer does not influence the bond strength of the single-lap joint.

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