“Subconsciousness-triggered” human body defensive strategy: Bi-stability intelligent joint with bionic kirigami structure

Kirigami structures are increasingly popular in wearable devices due to their exceptional properties. However, their mechanical robustness and anti-impact properties during structural deformation have been overlooked. This study addresses this issue by introducing defects on the surface of composites, mimicking pangolin scales to produce negative Poisson's ratio deformation during tensile strain. Kevlar, conductive shear stiffening elastomer (c-SSE), and PET are combined (Kiri-Kevlar). When subjected to impact, the subconscious rapid response of humans leads to bending arms or curling up, causing Kiri-Kevlar assembled at joints to stretch and undergo structural deformation. The Kiri-Kevlar deformation and high energy dissipation characteristics of c-SSE effectively resist external impact. In summary, a functional-integrated wearable device is developed based on a bionic kirigami structure, realizing efficient anti-impact and providing ideas for a new generation of human-computer interactive intelligent protection devices.