Invited Speaker

Weidong Yang
Tongji University, ChinaSpeech Title: Multiscale Homogenization Method for the Electromechanical Coupling of Porous Viscoelastic Nanocomposites
Abstract: Porous nanocomposites, due to the flexible tunability of their microstructures, offer precise control over the material's stiffness and sensitivity to external mechanical stimuli, making them highly advantageous in the design of sensitive layers for flexible sensors. However, the inherent viscoelastic properties of the matrix material significantly influence the overall electromechanical response under both static and dynamic loading conditions, leading to reduced accuracy and stability in the output signals of flexible sensors. Therefore, understanding the coupling effects between material viscoelasticity and microstructure, and their impact on the electromechanical response of porous nanocomposites, has become one of the key scientific challenges in flexible sensor design. To address this issue, this study proposes a multiscale electromechanical homogenization method that accurately establishes a quantitative correlation model between the material's microstructure and its macroscopic viscoelastic electromechanical response. The model considers the pore evolution characteristics in the porous structure, enabling effective capture of the dynamic and static loading and unloading response characteristics of porous nanocomposites under different mechanical conditions. The proposed model has been validated through both experiments and simulations, demonstrating good accuracy and effectiveness. Furthermore, parameter analysis of the theoretical model reveals the specific influence of viscoelasticity on the accuracy, stability, and hysteresis of the electromechanical response of porous nanocomposites, providing a theoretical foundation and effective guidance for the design and optimization of high-performance flexible sensor materials.