Method for pasting FBG sensor on carbon fiber reinforced plastic

Abstract

The invention discloses a method for pasting an FBG sensor on a carbon fiber reinforced plastic. The FBG sensor is pasted on the surface of the carbon fiber reinforced plastic by adopting a binder; atleast part of the FBG sensor is wrapped in the binder; the binder is an epoxy resin binder; the maximum length L of a binder layer formed by the binder in the length direction of the FBG sensor is larger than or equal to 12mm; and the maximum height of the binder layer formed by the binder in the height direction of the FBG sensor is less than or equal to 0.4mm. The influence of the surface pasting mounting process can be reduced and the strain monitored by the FBG sensor is ensured to be consistent with the actual strain of the CFRP as much as possible, so that the sensitivity of the FBG sensor is improved.

Description

technical field [0001] The invention relates to a method for pasting an FBG sensor on a carbon fiber reinforced composite material. Background technique [0002] At present, it is the general trend to form new materials through a certain processing technology to realize synchronous monitoring of fiber gratings and carbon fiber reinforced composite materials (hereinafter referred to as CFRP). In order to achieve this goal, the connection method between the FBG sensor and the measured object must be considered. Only when it deforms synchronously with the measured object, can the timely feedback signal realize real-time monitoring, [0003] There are two main installation methods of FBG sensors on CFRP: [0004] The first is the pasting installation method: surface bonding is to use a suitable adhesive to attach the FBG sensor to the CFRP. When the CFRP is deformed due to the external load, it will transmit a signal to the outside through the FBG sensor to sense the change. ....

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Problems solved by technology

[0008] The second type is AB glue binder. AB glue binder has good mechanical properties, high strength and hardness, and can be cured at room temperature, but it is difficult to spread evenly due to its high viscosity, and Aging will occur after prolonged use

[0009] The third is 502 adhesive. As an instant adhesive, 502 adhesive can bond the FBG sensor to the measured object in a short time, and the adhesive layer is very thin, which can transmit the strain signal well and reduce interference, but Since the bonding area between the FBG sensor and the measured object is small, it is easy to detach

[0010] However, in the process of use, almost few users will deeply explore the influence of the above three conventional adhesives on the surface bonding of FBG sensors. At the same time, parameters such as the length and thickness of the bond are often ignored, resulting in FBG The sensitivity of the sensor changes, even affecting the judgment of the health status of CFRP

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