Hybrid Auxetic Architectures: Integrating Curvature‐Driven Design for Enhanced Mechanical Tunability and Structural Performance

Le résumé fourni par la source

Piezoresistive sensors are crucial for strain monitoring but often suffer from rigidity and susceptibility to failure under large deformations. Auxetic materials, characterized by a negative Poisson's ratio, offer a promising solution by enabling sensors with enhanced flexibility, sensitivity, and stretchability. This study investigates the effects of curvature on two auxetic structures: re‐entrant and s‐shape lattices. These structures are designed with varying curvature, simulated under uniaxial tension, and experimentally are tested using photoelasticity and image processing. Results indicate that curvature influences auxetic behavior, stress concentration, and overall stretchability. The re‐entrant s‐shape hybrid honeycomb (RSHH) and reduced curve re‐entrant hybrid honeycomb (RCRSHH) exhibit maximum stretchability (≈56 mm), outperforming conventional auxetic structures. While RCRSHH achieves 200% linear deformation and distributes stress more uniformly, it shows diminished auxeticity. Finite element analysis using Ogden hyperelastic modeling successfully captures experimental trends. This study bridges the gap in auxetic material research by exploring curvature‐driven enhancements in structural performance. The findings offer new insights into optimizing stretchable sensors, with potential applications in aerospace, medical devices, and flexible electronics, where materials must sustain extreme deformations while maintaining structural integrity.

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