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Strain sensing characteristics of 3D‐printed conductive plastics

McGhee, Jack; Sinclair, Matt; Southee, Darren; Wijayantha, Upul

Authors

Jack McGhee

Darren Southee

Upul Wijayantha



Abstract

Three types of commercially available conductive three-dimensional (3D) printing filament are electrically characterised for use in 3D-printed functional devices. The three plastics were carbon dispersed acrylonitrile butadiene styrene, carbon dispersed polylactic acid (PLA) and graphene dispersed PLA. The method of 3D printing used was material extrusion and prints were made in both single and dual extrusion modes. The plastics were found to be piezoresistive, enabling them to be characterised as strain sensors. The electrical characteristics of these materials enabled the measurement of strain using low cost, readily available prototyping equipment and minimising the requirement for dedicated instrumentation components (e.g. Wheatstone bridges). Increasing the thickness of the plastics improved conductivity. However, this also decreased the reliability and reproducibility of strain sensor data due to a complex internal 3D structure. The recommendation for reliable use in prototyping and manufacturing is to print tracking under 0.8 mm thickness, thus producing resistance measurements that are predictable and follow a linear regression up to R2 = 0.9991. A dual extruded 3D print was fabricated as a final demonstration. A force sensing resistor interface was created. The final demonstration uses a PIC18F45K20 microcontroller to process sensor inputs, outputting to an alphanumeric LCD.

Journal Article Type Article
Online Publication Date May 1, 2018
Publication Date May 1, 2018
Deposit Date Dec 5, 2022
Publicly Available Date Dec 5, 2022
Print ISSN 0013-5194
Publisher Institution of Engineering and Technology (IET)
Peer Reviewed Peer Reviewed
Volume 54
Issue 9
Pages 570-572
DOI https://doi.org/10.1049/el.2018.0363
Public URL http://researchrepository.napier.ac.uk/Output/2967350
Publisher URL https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/el.2018.0363

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