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Device and method for measuring stress relaxation of fiber reinforced composite rib

A technology for measuring fibers and reinforcing composites, applied to measuring devices, using stable tension/pressure to test material strength, strength characteristics, etc., to achieve high measurement accuracy, simple structure, and avoid stress loss.

Active Publication Date: 2021-08-24
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At the same time, the elastic modulus of FRP tendon has a time-dependent effect, and the method of obtaining the corresponding stress by measuring the strain of the tendon body is not applicable, and a load sensor needs to be installed to monitor the load change

Method used

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  • Device and method for measuring stress relaxation of fiber reinforced composite rib
  • Device and method for measuring stress relaxation of fiber reinforced composite rib
  • Device and method for measuring stress relaxation of fiber reinforced composite rib

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Embodiment Construction

[0048] In order to detail the technical content, structural features, achieved goals and effects of the present invention, the following will be described in detail in conjunction with the accompanying drawings.

[0049] Devices for measuring the stress relaxation of fiber reinforced composite tendons, such as figure 1 As shown, it includes longitudinal support 1, centering backing plate 2, fixing screw 3, strain conducting iron rod 4, dial indicator 5, FRP tendon 6, threaded sleeve 7, centering rubber plug 8, through-center load sensor 9, Loading nut 10, limit-turn nut 11, caliper 12, limit-turn screw 13, threaded pin 14 with round hole, epoxy resin 15 and auxiliary nut 16, all have national standard fine thread inside and outside threaded sleeve 7. The thickness of the epoxy resin used in this measuring device should be 1-3mm.

[0050] Such as figure 2 and image 3 As shown, the two ends of the longitudinal support 1 are respectively fixedly connected by the fixing screw...

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Abstract

The invention provides a device for measuring stress relaxation of a fiber reinforced composite rib and a measuring method thereof. The two ends of a longitudinal support are fixedly connected with the first end of a centering base plate through fixing screws respectively, the first end of a strain conduction iron rod is fixedly connected with the first end of a dial indicator, the middle of an FRP rib is located in the longitudinal support, and the loading end and the measuring end of the FRP rib are respectively connected with threaded sleeves through epoxy resin and extend out of the longitudinal support. The measuring method mainly comprises the following steps of firstly, bonding the threaded sleeves at the two ends of the FRP rib by using epoxy resin, and then sequentially assembling the FRP rib with other parts of a measuring device; then balancing the measuring device through a data acquisition system, slowly rotating a loading nut by adopting a wrench, and tensioning the FRP rib; and finally, calculating the stress relaxation rate of the FRP rib according to the collected data. According to the method, the lower limit quantitative indexes of the rigidity of a reaction frame and the threaded sleeves are given, whether the reaction frame and the threaded sleeves are matched with the FRP rib or not can be judged through calculation, and the measurement precision is high.

Description

technical field [0001] The invention relates to the field of FRP performance detection of fiber composite reinforced materials, in particular to a device for measuring stress relaxation of fiber reinforced composite tendons and a measurement method thereof. Background technique [0002] FRP bar is a new type of composite material made of fiber and resin composite technology. Due to its high tensile strength and good corrosion resistance, it is widely used in bridge structures and marine engineering in extremely harsh environments. FRP bars have high strength but low elastic modulus. When the members with normal FRP bars in the structure reach the limit state of normal service, the strength of FRP bars cannot be fully exerted, which limits the exertion of the high-strength characteristics of FRP bars. The use of prestressing technology can effectively improve the utilization of FRP tendon strength and improve the performance of components. The prestressed FRP material has a ...

Claims

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Application Information

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IPC IPC(8): G01N3/08G01N3/04
CPCG01N3/08G01N3/04G01N2203/0676G01N2203/0075
Inventor 孙艺嘉赵庆新赵大海张景辉邱永祥高青宇王灿武亮
Owner YANSHAN UNIV
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