Novel 3D printed capacitive shear stress sensor

Jens Oprel; Gerjan Wolterink; Jurnan Schilder; Gijs Krijnen

doi:10.1016/j.addma.2023.103674

Novel 3D printed capacitive shear stress sensor

Jens Oprel^*, Gerjan Wolterink, Jurnan Schilder, Gijs Krijnen

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

This paper describes the research into 3D printed capacitive shear stress sensors. The context is the development of a technology that can potentially be used in shoe insoles. This is interesting in medical applications, such as prevention of diabetic foot ulcers. The base geometry consists of a capacitive layout with parallel wire structures and has two flexible elements on two sides. Experimental devices are optimized using electrostatic and mechanical models and printed using material extrusion additive manufacturing (AM) with a flexible thermoplastic polymer (TPU). Two geometries with different sizes are designed and tested. The smallest design is 8.75×8.75×11mm and its responsivity is measured to be 0.9 pF/MPa for a measurement range of ±140kPa. The design can easily be altered to meet specifications for a variety of other applications. The realized sensors show some hysteresis, which we attribute primarily to the mechanical behavior. The capacitive measurement of the displacement is quite linear. The mechanical hysteresis can partially be explained by the properties of the printed material. The results are promising for application in shoe insoles and can relatively easily be adapted to meet requirements for other applications.

Original language	English
Article number	103674
Journal	Additive manufacturing
Volume	73
DOIs	https://doi.org/10.1016/j.addma.2023.103674
Publication status	Published - 5 Jul 2023

Keywords

3D printed sensor
Capacitive sensor
Electrostatic modeling
Mechanical beam modeling
Shear stress
UT-Hybrid-D

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

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ArticleFinal published version, 20.7 MBLicence: CC BY

Cite this

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title = "Novel 3D printed capacitive shear stress sensor",

abstract = "This paper describes the research into 3D printed capacitive shear stress sensors. The context is the development of a technology that can potentially be used in shoe insoles. This is interesting in medical applications, such as prevention of diabetic foot ulcers. The base geometry consists of a capacitive layout with parallel wire structures and has two flexible elements on two sides. Experimental devices are optimized using electrostatic and mechanical models and printed using material extrusion additive manufacturing (AM) with a flexible thermoplastic polymer (TPU). Two geometries with different sizes are designed and tested. The smallest design is 8.75×8.75×11mm and its responsivity is measured to be 0.9 pF/MPa for a measurement range of ±140kPa. The design can easily be altered to meet specifications for a variety of other applications. The realized sensors show some hysteresis, which we attribute primarily to the mechanical behavior. The capacitive measurement of the displacement is quite linear. The mechanical hysteresis can partially be explained by the properties of the printed material. The results are promising for application in shoe insoles and can relatively easily be adapted to meet requirements for other applications.",

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author = "Jens Oprel and Gerjan Wolterink and Jurnan Schilder and Gijs Krijnen",

note = "Funding Information: The authors would like to thank ir. Dimitris Kosmas for helping with the capacitance measurements using the AD7747 and ing. Andries van Swaaij from the Elastomer Technology and Engineering group (University of Twente) for facilitation and assistance with DMA. This work was financially supported by the 4TU Dutch Soft Robotics Consortium . Publisher Copyright: {\textcopyright} 2023 The Author(s)",

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AU - Krijnen, Gijs

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PY - 2023/7/5

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Novel 3D printed capacitive shear stress sensor

Abstract

Keywords

UN SDGs

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