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Vol. 259, Issue 5, October 2022, pp. 12-18




Mechanical Modelling and Stress-Strain Prediction of Electroactive Polymer-Based Capacitive Sensor
under Multiaxial Loads using Uniaxial Tensile Data

Nitin Kumar SINGH, Kazuto TAKASHIMA and Shyam S. PANDEY

Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, 2-4 Hibikino, Wakamatsu campus,

Kitakyushu, Fukuoka 808-0196, Japan Telefax: +81-93-695-6230

E-mail: nitinmjpruiitp@gmail.com, singh.nitin-kumar228@mail.kyutech.jp, nitin.mt12@iitp.ac.in, shyam@life.kyutech.ac.jp


Received: 1 July 2022 /Accepted: 1August 2022 /Published: 31 October 2022



Abstract: In this paper, mechanical modelling and stress-strain prediction of the ionic type of electroactive polymer (EAP) based capacitive strain sensor under multiaxial loading has been performed using uniaxial tensile data. A highly stretchable sensor with >400 % strain was fabricated using Styrene-ethylene-butylene-styrene (SEBS) rubber and Dodecyl benzene sulphonic acid (DBSA) doped polyaniline (PANI) composite material as a dielectric film, and carbon grease as top and bottom electrodes. From uniaxial tensile measurements, a three-dimensional constitutive model of the EAP strain sensor was validated. Experimental data obtained from the uniaxial tensile measurement was fitted according to the Ogden-based constitutive mathematical model. For predicting the stress-strain behaviour of the sensor under the multiaxial loads, 2nd term of the Ogden model was demonstrated to fit well with uniaxial tensile data. Such modelling can play a significant role in designing any type of EAP-based sensor for various operations under variable loading conditions.


Keywords: Ionic type of electroactive polymers, Strain sensors, Multiaxial loading, Constitutive modelling, Curve fitting, Uniaxial tensile testing.


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