Integrating resistance-based sensing into fused filament fabricated mechanical metamaterial structure

The current research explores the integration of resistance-based sensing (RbS) capabilities in mechanical metamaterial (MM) structure, diverging from prevalent capacitance-based methods. The study aims to enhance the adaptability and functionality of MM structures by enabling RbS, facilitating real-time monitoring, and responsiveness to external stimuli. The methodology involves strategically incorporating conductive carbon paste into specific regions of the metamaterial structure. Through deformation, these regions undergo changes in resistance, which can be measured with an Arduino-based voltage divider circuit. This method not only enriches the spectrum of sensing techniques within mechanical metamaterials but also underscores the feasibility and practicality of employing RbS. The outcomes demonstrate linear variation in resistance with loads up to 70 g for a single-cell MM structure. The structure also demonstrated real-time sensing of dynamic loading. The outcomes of this research demonstrate the successful implementation of RbS in mechanical metamaterials, showcasing good sensitivity and an extended working range compared to conventional discrete sensing approaches.