Process for mass-producing distributed high-accuracy self-monitoring fiber reinforced polymer (FRP) bars/cables on the basis of fiber-optic sensing

Abstract

The invention provides a process for mass-producing distributed high-accuracy self-monitoring FRP bars / cables on the basis of fiber-optic sensing technology. The process mainly comprises the following procedures: (1), preparing and packaging an optical fiber sensor, that is, improving the sensing accuracy of the existing common single-mode communication optical fiber by the non-slip and long-gauge processing technology and reinforcing and strengthening the single-mode communication optical fiber by braiding / winding fiber around the single-mode communication optical fiber in a non-adhesive manner, thereby adapting to the mechanized production of the FRP bars / cables; and (2), the extrusion-forming process of the self-monitoring FRP bars / cables with controllable solidifying length (namely the length of a single FRP bar / cable), that is, a mass-production flow for introducing the packaging product of the high-accuracy optical fiber sensor into the modified FRP bars / cables. The process can ensure that the resin is fully solidified within the use length range of the bar / cable, while the resin at the end zone is not solidified, so that the fiber-optic interface can be led out. The process mainly comprises the key processes for controlling the optical fiber compounding state, the appearance and the length of the bars / cables, the coupling of temperature and pulling speed and the like.

Description

(1) Technical field [0001] The invention is a large-scale production process of distributed high-precision self-monitoring FRP tendons / cables based on optical fiber sensing, and belongs to the technical field of intelligent structural materials and sensory monitoring. (2) Background technology [0002] Continuous fiber reinforced polymer composites (Fiber Reinforced Polymer, FRP) have the advantages of high strength, low density, and good durability. Therefore, it is considered to be an excellent choice to replace steel in civil engineering structures. The fibers currently used in practical engineering are mainly carbon fibers, glass fibers, spinning wheel fibers and basalt fibers. Fibers and polymers can be combined into tendons / cables, plates and other various forms of profiles. Among them, FRP ribs have received extensive attention from researchers. In China, some scientific research institutes such as Southeast University and Fuzhou University have conducted systematic ...

AI Technical Summary

Problems solved by technology

[0005] However, there are some problems in actual production and application: (1) the optical fiber is relatively fragile, and its survival rate is very low in the pultrusion molding process of FRP tendons / cables, which seriously affects continuous mass production; (2) in the FRP material It is difficult to lead out the optical fiber sensor interface (that is, a free optical fiber used to connect other optical fiber sensors) in the ordinary composite process (that is, thermosetting composite); (3) between the light transmission element (that is, the core and the cladding) and the peripheral resin coating Factors such as slippage and non-uniform fiber strain within the spatial resolution energy (ie, the minimum measurement distance) reduce the accuracy of distributed sensing tests

[0007] However, various researches at present always involve very cumbersome manual processing, which not only reduces the level of industrialization and increases production costs, but also affects the yield of products and the stability of performance.

Moreover, the optical fiber used is generally an ordinary commercial communication optical fiber, which will reduce the actual sensing and testing accuracy of the product

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