Highly Stretchable Anti-Chiral Auxetic Structure Having Tunable Poisson’s Ratio

In this study, we present an innovative anti-chiral auxetic structure designed for exceptional stretchability and unique auxetic properties. Our design integrates circular elements with spiral interconnections, resulting in superior stretchability and auxetic characteristics compared to conventional auxetic structures.<br/>Through Finite Element (FE) simulations, we identified two key design features. First, our design allows for precise control of the Poisson's ratio through careful geometric adjustments. Second, the circular components maintain their alignment even when stretched, indicating the potential for distortion-free stretchable displays.<br/>Building on these insights, we developed a conceptual stretchable auxetic display capable of adjusting its Poisson's ratio before and after stretching, thereby altering its aspect ratio as needed. To demonstrate practical applications, we fabricated a preliminary prototype of an auxetic display using 3D printing combined with mini LEDs. This prototype serves as a proof of concept, achieving remarkable stretchability while maintaining a Poisson's ratio of negative one, ensuring the LED display remains undistorted under stress.<br/>In conclusion, our advanced anti-chiral auxetic design holds significant promise for a range of applications, including stretchable displays, wearable electronics, skin-affixed sensors, and adaptable devices.