A bionic strain sensing structure and its forming method

Abstract

The invention discloses a bionic stress sensing structure and a formation method thereof. According to the bionic stress sensing structure, a conducting ink layer with strip-shaped parallel slit bands is formed on a paper substrate. The conducting ink layer is compact and rigid while the paper substrate is porous and soft. The formation method of the bionic stress sensing structure includes printing a layer of conducting ink on the paper substrate, wherein the conducting ink forms the dry conducting ink layer which is compact and rigid after drying up; and bending the paper substrate so as to make the dry conducting ink layer to break in the bending process. In this way, a plurality of slits are formed in the dry conducting ink layer and the slits form the slit band bionic structure. The dry conducting ink layer becomes the conducting ink layer with the strip-shaped slit bands, so that the bionic stress sensing structure is formed. When the paper substrate is stressed and deformation occurs, the contact degree of the slit walls of the strip-shaped slits of the slit band bionic structure changes, so that the resistance of the conducting ink layer varies. Therefore, the stress sensing function is achieved.

Description

technical field [0001] The invention relates to the field of strain sensing, in particular to a bionic strain sensing structure and a forming method thereof. In particular, it relates to a method for preparing a bionic strain sensing structure by printing on a paper substrate. The conductive coating is brushed on the surface of the paper substrate, and after being bent and broken, strips of parallel cracks are formed, forming a specific bionic crack structure. When the paper substrate is strained after being stressed, the crack width changes, that is, the contact degree of the crack wall changes, resulting in a change in its overall resistance, that is, a piezoresistive phenomenon occurs, and the strain sensing function is realized. The prepared strain-sensing structure is a bionic structure inspired by the vibration perception of scorpions, and the bionic model is derived from the seam receptors of scorpions' vibration perception. Background technique [0002] Sensors for...

AI Technical Summary

Problems solved by technology

Metal sheet-type strain gauges with length changes have small length changes and small resistance changes during straining, so the strain detection range is small, and their gage factors (gauge factor, GF) are generally not high, ranging from 1.5 to 10. Within; new material strain sensors represented by metal nanoparticles or carbon nanotubes, graphene, etc., because their substrates are mostly flexible materials, the strain range is large and the sensitivity coefficient is high, but noble metal nanoparticles, carbon nanotubes or graphene materials The cost is high, the synthesis of the material is complicated, and the stability of the synthesis process is not good; the strain sensing structure of the micro-nano structure type is processed by photolithography technology, and the process reliability is good, but the manufacturing cost is high and the preparation process is complicated; in addition, The growth of the dendritic structure of nanowires is random, and it is difficult to control the parameters

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