Laser-based surface preparation of composite laminates leads to improved electrodes for electrical measurements

Abstract

Laserbased surface preparation of composite laminates leads to improved electrodes for electrical measurements, Applied Surface Science (2015), http://dx.doi.org/10.1016/j.apsusc. 2015.10.086 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.Page 1 of 32 A c c e p t e d M a n u s c r i p t AbstractElectrical impedance tomography (EIT) is a low-cost, fast and effective structural health monitoring technique that can be used on carbon fiber reinforced polymers (CFRP). Electrodes are a key component of any EIT system and as such they should feature low resistivity as well as high robustness and reproducibility. Surface preparation is required prior to bonding of electrodes. Currently this task is mostly carried out by traditional sanding. However this is a time consuming procedure which can also induce damage to surface fibers and lead to spurious electrode properties. Here we propose an alternative processing technique based on the use of pulsed laser irradiation. The processing parameters that result in selective removal of the electrically insulating resin with minimum surface fiber damage are identified.A quantitative analysis of the electrical contact resistance is presented and the results are compared with those obtained using sanding.

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The effect of z-binding yarns on the electrical properties of 3D woven composites

“…Afterwards, bonding of electrodes on the specimen was conducted. Four regions (5 mm wide) in the specimen were polished with sand paper (320 grit size), cleaned using acetone and treated with concentrated sulfuric acid to expose the fibres and ensure a good contact between electrodes and specimen [45].…”

Real-time electrical impedance monitoring of carbon fiber-reinforced polymer laminates undergoing quasi-static indentation

“…Following the procedures outlined by the authors in Ref. [19], we then removed the resin from CFRP surface using Yb-fiber laser irradiation, cleaned the surface, masked it with vinyl tape and used silver paste (Electron Microscopy Sciences, USA) on the unmasked regions as the electrode material. Wires were bonded to the silver paste using a conductive silver epoxy adhesive.…”