▎ 摘　　要

NOVELTY - Micro-flow channel stress sensor based on structural meta-material, has upper elastic polymer layer, conductive graphene channel, middle elastic polymer layer and bottom elastic polymer layer from top to bottom. The stress sensor further includes flexible superstructure grid layer. The grid units of the flexible superstructure grid layer are flatly spread, and the grid unit is a concave hexagon. The flexible superstructure grid layer is located between middle elastic polymer layer and bottom elastic polymer layer. USE - Micro-flow channel stress sensor based on structural meta-material. ADVANTAGE - The stress sensor can realize device resistance change trend reversal when it is axially stretched, uniform the resistance change trend of the device in the full direction, and improves the strain coefficient of the device, and designing the unit structure parameter of the concave hexagonal grid and the unit distribution design, controlling the negative Poisson ratio characteristic to the micro-channel stress sensor influence degree, so that the device can be completely insensitive to the pipe diameter stretching direction, namely realizing the stress decoupling in the axial direction and the transverse direction, and provides reasonable design direction for the device only to measure the stress signal in specific direction. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for preparation of the micro-flow channel stress sensor based on structural metamaterial, which involves: (A) preparing flexible superstructure grid layer using laser to cut on the flexible film to form concave hexagonal grid; (B) preparing upper elastic polymer layer and conductive graphene channel by micro-flow channel mold; (C) preparing bottom elastic polymer layer by spin-coating method; (D) placing the flexible superstructure grid layer on upper surface of the bottom elastic polymer layer; (E) preparing middle elastic polymer layer by spin-coating method; (F) placing the micro-flow channel structure on the upper surface of the middle elastic polymer layer; (G) curing; (H) obtaining main structure of the stress sensor; (I) filling single-layer graphene dispersion liquid in the micro-flow passage of the stress sensor main structure; and (J) connecting the electrodes at two sides of the micro-flow passage to obtain needed micro-flow passage stress sensor. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the micro-flow channel stress sensor.