Composite Structures 519(2025)165392

Keywords:  Kirigami metamaterial  Reconfigurable  Dual-mode sensor  4D Printing  Triboelectric-piezoelectric

Mechanical metamaterials have been widely investigated because of their unique mechanical properties. Due to their exceptional properties, mechanical metamaterials can be combined with other materials and technologies to integrate more functions, such as applications in sensor design. The low stiffness, negative stiffness and high sensitivity of Kirigami mechanical metamaterials contribute to improving the sensing accuracy and efficiency of the sensor. This work proposes a sensor based on a 4D printed pyramid Kirigami mechanical metamaterials (PKMM). And we integrates composite triboelectric and piezoelectric sensing mechanisms for comprehensive monitoring of multi-dimensional mechanical signals. This sensor shows surface conformality and reconfigurability, allowing for adaptable shape morphing across different environments. The composite triboelectricpiezoelectric mechanism enables the sensor to exhibit high sensitivity, broadening the pressure sensing range and facilitating precise measurement of displacement variables. This PKMM-based sensor effectively monitors the conformal motion of the human elbow joint. And its axial array configuration allows for the sensing of complex multi-dimensional deformations. Moreover, the modular island-bridge array can accurately analyze multi-point load distributions. This work highlights the PKMM's applications in biological motion monitoring and intelligent protective equipment, providing innovative solutions for multifunctional flexible sensors.

Song Liu , Zhaoxuan Niu , Wei Zhao , Chengjun Zeng , Yanju Liu , Jinsong leng

4D printed kirigami metamaterial with reconfigurability for dual-mode displacement-pressure sensing.pdf