Intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and large-scale production process thereof

Abstract

The invention discloses an intelligent FRP (Fiber Reinforced Polymer) composite rib based on carbon fiber distribution type sensing and a large-scale production process thereof. The intelligent FRP composite rib consists of a long-gauge carbon fiber sensing core and a wrapping FRP layer, wherein the long-gauge carbon fiber sensing core consists of a semi-finished carbon fiber sensing core, a non-conductive fiber wrapping layer, a glue isolating layer and a protective layer, the semi-finished carbon fiber sensing core consists of carbon fiber and a resin curing layer, an electrode is arranged on the carbon fiber, the non-conductive fiber wrapping layer is wound on the outer surface of the semi-finished sensing core, the thickness of the non-conductive wrapping layer at the electrode is larger than that of the non-conductive fiber wrapping layer at the non-electrode position, and the glue isolating layer and the protective layer are arranged on the outer surface of the non-conductive fiber wrapping layer at the non-electrode position in sequence. The intelligent FRP composite rib disclosed by the invention has a distribution type stable monitoring property and a good mechanical property, but production cost of the intelligent FRP composite rib is slightly higher that of a common FRP rib.

Description

technical field [0001] The invention relates to an intelligent FRP composite bar based on carbon fiber distributed sensing and a large-scale production process thereof, belonging to the technical field of intelligent materials and structures and sensor monitoring. technical background [0002] Continuous fiber reinforced polymer composites (Fiber Reinforced Polymer, FRP) have many advantages such as high tensile strength, low density, high specific strength and specific stiffness, chemical corrosion resistance, and good durability. Therefore, FRP is considered to be a good choice to replace steel in civil, transportation, geotechnical and other engineering structures, and has broad application prospects. At present, the fibers used in practical engineering mainly include carbon fiber, glass fiber, spinning wheel fiber, basalt fiber, Dyneema fiber, PBO fiber and other fibers. Fibers and polymers can be combined into bars, plates and other various forms of profiles. . Among ...

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Problems solved by technology

[0006] However, there are mainly the following problems in actual production and application: (1) Carbon fiber is easily damaged and has a low survival rate in the pultrusion molding process of FRP bars, which affects the accuracy of continuous mass production and measurement; (2) ) It is difficult to lead out the wires of the carbon fiber sensing core (that is, the wires used to connect the measuring equipment) in the ordinary composite process of FRP materials (that is, thermosetting composite); The accuracy of the distributed sensing test is improved, and there is a certain degree of slippage between the sensing core and the peripheral fiber; (4) The usual molding process does not carry out pre-tensioning, and the non-pre-tensioning carbon fiber usually senses before 300με poor performance

[0008] However, at present, various researches always involve very complicated manual processing, which not only reduces the level of industrialization, increases production costs, but also affects the yield of products and the stability of performance.

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