Authors: L. Harish; C. Lakshmana Rao
Addresses: Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai – 600036, India ' Department of Applied Mechanics, Indian Institute of Technology Madras, Chennai – 600036, India
Abstract: In this study, we present the results of cyclic electromechanical experiments conducted on uniaxially stretched poly(vinylidene fluoride) (PVDF) films. The experiments were carried out over a range of applied displacement amplitude ranging from 0.5 mm to 1.5 mm, superposed on an initial stretch on the test samples. The strains were calculated using non-contact speckle monitoring method. The hysteresis plots of mechanical and electromechanical cyclic responses are presented. Stress relaxation was observed up to 70% in orthogonal to stretch direction and 16% in the stretch direction. Observed piezoelectricity along both the directions is reported and discussed in the paper.
Keywords: poly(vinylidene fluorid); PVDF; cyclic loading; non-contact speckle method; electromechanical response; piezo sensor.
International Journal of Materials and Structural Integrity, 2019 Vol.13 No.1/2/3, pp.160 - 171
Received: 01 Dec 2018
Accepted: 23 Feb 2019
Published online: 27 Jun 2019 *