Piezoelectric Response Analysis of Ferroelectret with Annular Configuration

Ferroelectric coaxial sensors (FCSs), one of the 1D thread-like electronics, offer a broad range of applications in the Internet of Things (IoT) fields. However, previously reported FCSs have limited prospects due to a lack of in-depth theoretical research. As a result, the ferroelectric annular configuration (FAC) was extracted as the fundamental structural configuration of the FCSs in this work. The anisotropic hyperelastic constitutive model was adopted to simulate the nonlinear mechanical deformation of ferroelectret. The materials parameters in the constitutive model for radiated cross-linked polypropylene (IXPP) ferroelectret were determined by fitting the experimental results of the uniaxial tensile, uniaxial compression, and picture frame shear tests orderly and simply. The numerical results of the piezoelectric response of FAC based on the constitutive model are almost the same as the experimental value, validating the model’s effectiveness. Finally, the effect of the material parameters in the constitutive model on the piezoelectric response of the ferroelectret film and FAC was further investigated.