Scale manufacturing technique of distributed high-precision self-monitoring FRP bar/rope based on optical fiber sensing

Abstract

The invention discloses a scale manufacturing technique of a distributed high-precision self-monitoring FRP bar / rope based on optical fiber sensing. The technique mainly comprises the two procedures of: (1) preparation and packaging of a high-precision long gauge length optical fiber sensor, namely coating a resin coating layer with larger rigidity and thickness directly at the periphery of an optical fiber light-transmitting element, manufacturing non-slip optical fiber, then weaving / winding fiber at the periphery thereof in an unbonded manner and finally, coating an insulating gum with gauge length at the interval section of the surface to form a packaging product of long gauge length optical fiber; (2) using a long gauge length insulating method to manufacture the self-monitoring FRP bar / rope, namely leading the packaging product of long gauge length optical fiber into the scale production process of the FRP bar / rope, mainly comprising main techniques of control of optical fiber composite state, control of the shape of the self-monitoring FRP bar / rope and the like, and leading out the optical fiber in the insulating gum so as to be used for connecting other optical fiber by stripping the curved FRP. The product manufactured by the method can be cut randomly according to requirements and is a universal type product.

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 ...

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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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