Abstract
Force sensitive conductive composite materials are functional materials which can be used as the sensitive material of force sensors. However, the existing sensors only use one-dimensional electrical properties of force sensitive conductive materials. Even in tactile sensors, the measurement of contact pressure is achieved by large-scale arrays and the units of a large-scale array are also based on the one-dimensional electrical properties of force sensitive materials. The main contribution of this work is to study the three-dimensional electrical properties and the inversion method of three-dimensional stress field of a force sensitive material (conductive rubber), which pushes the application of force sensitive material from one dimensional to three-dimensional. First, the mathematical model of the conductive rubber current field distribution under a constant force is established by the effective medium theory, and the current field distribution model of conductive rubber with different geometry, conductive rubber content and conductive rubber relaxation parameters is deduced. Secondly, the inversion method of the three-dimensional stress field of conductive rubber is established, which provides a theoretical basis for the design of a new tactile sensor, three-dimensional stress field and space force based on force sensitive materials.
Highlights
Over the past decades, conductive polymer materials have attracted a great deal of attention due to their potential applications, especially in the field of intelligent artificial skin, tactile sensing and intelligent sensing gloves [1,2,3,4,5]; Conductive silicone is a conductive polymer composite material that is the core material of flexible pressure sensors
Inversion method of the three-dimensional stress is field of conductive rubber is established, andshape, the three-dimensional stress field of conductive rubber established, and the influence of electrode influence of electrode shape, electrode number and electrode position on the three-dimensional electrode number and electrode position on the three-dimensional stress inversion mechanism under stress inversion mechanism under different geometric shapes is studied, which provides a different geometric shapes is studied, which provides a theoretical basis for the design of a new tactile theoretical basis for the design of a new tactile sensor, three-dimensional stress field and space force sensor, three-dimensional stress field and space force based on force sensitive materials
A three-dimensional visualization method of silica gel stress field based on three-dimensional resistance tomography is proposed by using the piezoresistive effect of silica gel with conductive particles
Summary
Conductive polymer materials have attracted a great deal of attention due to their potential applications, especially in the field of intelligent artificial skin, tactile sensing and intelligent sensing gloves [1,2,3,4,5]; Conductive silicone is a conductive polymer composite material that is the core material of flexible pressure sensors. Metal series materials are important fillers of conductive silicone rubber because of their excellent conductivity, the stable chemical properties of the filled polymer and the persistent. The silver plating technology has overcome the shortcomings of high density and easy oxidation of metal series conductive fillers. It is accompanied by defects of the filler coating that falls off [21]. The carbon series conductive filler resources are abundant and they are not oxidized when being used, so the physical and mechanical properties of the polymer materials are ensured. Carbon black, which is cheap, can be made from a wide range of raw materials, and has small unit density, is easy to process and shape, gives good dispersions, good effects on the rubber compound, and chemical stability, is generally selected as the carbon-based conductive filler [22]
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