Journal Article

Multi‐Objective Bayesian Optimization for Laminate‐Inspired Mechanically Reinforced Piezoelectric Self‐Powered Sensing Yarns

Kim, Miso, Choi, Yong Jun, Kim, Yong‐Il, Cho, Jaewon, Park, Kundo, Nam, Jisoo, Ryu, Seunghwa, Yang, Ziyue, Kim, Hyeonsoo

2024

Overview

Piezoelectric fiber yarns produced by electrospinning offer a versatile platform for intelligent devices, demonstrating mechanical durability and the ability to convert mechanical strain into electric signals. While conventional methods involve twisting a single poly(vinylidene fluoride‐co‐trifluoroethylene)(P(VDF‐TrFE)) fiber mat to create yarns, by limiting control over the mechanical properties, an approach inspired by composite laminate design principles is proposed for strengthening. By stacking multiple electrospun mats in various sequences and twisting them into yarns, the mechanical properties of P(VDF‐TrFE) yarn structures are efficiently optimized. By leveraging a multi‐objective Bayesian optimization‐based machine learning algorithm without imposing specific stacking restrictions, an optimal stacking sequence is determined that simultaneously enhances the ultimate tensile strength (UTS) and failure strain by considering the orientation angles of each aligned fiber mat as discrete design variables. The conditions on the Pareto front that achieve a balanced improvement in both the UTS and failure strain are identified. Additionally, applying corona poling induces extra dipole polarization in the yarn state, successfully fabricating mechanically robust and high‐performance piezoelectric P(VDF‐TrFE) yarns. Ultimately, the mechanically strengthened piezoelectric yarns demonstrate superior capabilities in self‐powered sensing applications, particularly in challenging environments and sports scenarios, substantiating their potential for real‐time signal detection. Inspired by composite laminates, electrospun fiber mats are strategically stacked to create highly strengthened P(VDF‐TrFE) yarns, preserving their high piezoelectric performance. A multi‐objective Bayesian optimization‐based machine learning algorithm is developed to optimize the stacking sequence, ultimately yielding mechanically robust piezoelectric polymer yarn with simultaneously improved ultimate tensile strength and failure strain for real‐time self‐powered sensing applications in diverse environmental conditions.

• Publisher: John Wiley & Sons, Inc,John Wiley and Sons Inc,Wiley
• Subject: electrospinning / Fluorides / Laminates / Machine learning / Mechanical properties / multi‐objective Bayesian optimization / Optimization / piezoelectric yarns / Polymers / self‐powered sensing / Signal transduction / Yarn / Zinc oxides