Device and method for measuring fatigue crack propagation rule of CFRP reinforced steel structure
A fatigue crack propagation and steel structure technology, applied in the direction of measuring devices, optical testing of flaws/defects, and material analysis through optical means, can solve the problems of being unable to monitor CFRP complex and irregular cracks and easily generating errors, etc., and achieve simple structure , easy to measure, low cost effect
Inactive Publication Date: 2016-05-25
WUHAN UNIV OF TECH
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Problems solved by technology
[0006] The technical problem to be solved by the present invention is to provide an intelligent and accurate method for measuring CFRP-reinforced steel structures in view of the fact that the method for measuring fatigue cracks in the prior art is prone to errors and cannot monitor the defects of complex and irregular cracks under CFRP coverage and reinforcement. Apparatus and method for fatigue crack growth law
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[0033] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.
[0034] Such as figure 1 As shown, the device for measuring the fatigue crack propagation law of CFRP reinforced steel structure according to the embodiment of the present invention includes a transverse measuring unit and a longitudinal measuring unit;
[0035] The transverse measurement unit includes a plurality of transverse optical fibers 2 arranged in parallel transversely on the tested object 1, and also includes a first photoelectric sensor 5 connected to the transverse optical fibers 2, which is used to convert the optical signals of the transverse optical fibers 2 into transverse electrical...
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The invention discloses a device and method for measuring the fatigue crack propagation rule of a CFRP reinforced steel structure. The device comprises a plurality of transverse optical fibers arranged in parallel in the transverse direction and a plurality of longitudinal optical fibers arranged in parallel in the longitudinal direction, the transverse optical fibers and the longitudinal optical fibers are arranged on a tested part, and the breaking tenacity of the transverse optical fibers and the longitudinal optical fibers are consistent with that of the tested part. Optical signals of the optical fibers are converted into electric signals through a photoelectric sensor, a displayer displays the on-off condition of each optical fiber according to the transverse electric signals, the other end of the displayer is connected with a data processing unit, and the data processing unit calculates the propagation path of cracks of the tested part and the propagation rate of the fatigue cracks according to the received breaking time and breaking positions of the optical fibers. The requirement for monitoring the propagation path of the complex and irregular cracks can be met. The device is simple in structure, low in cost and high in automation degree, measurement is easy, and the propagation condition of the cracks can be monitored in real time in the whole process.
Description
technical field [0001] The invention relates to the technical field of material fatigue performance detection, in particular to a device and method for measuring fatigue crack propagation laws of CFRP reinforced steel structures. Background technique [0002] With the widespread use of steel structures in bridges, high-rise buildings, cranes, offshore platforms, stadiums, etc., cracks are common in steel structures affected by environmental conditions and external loads. The existence of cracks greatly reduces the bearing capacity and life of the steel structure. In order to eliminate potential safety hazards, it needs to be reinforced and repaired. Traditional steel structure reinforcement methods include welding, riveting and bolting, etc. Although these methods have certain reinforcement effects, they will also bring a series of new problems, such as new stress concentrations and residual stresses. [0003] Carbon Fiber Reinforced Polymer (CFRP) is a new technology devel...
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CPCG01N21/8806
Inventor 刘志平陈凯陈山何超超柯亮
Owner WUHAN UNIV OF TECH