Test method for acoustic emission detection cable coating corrosion fatigue crack initiation and growth

A technique for corrosion fatigue, test methods, applied in the direction of material analysis using sonic emission technology, testing material strength using applied stable tension/pressure, measuring devices, etc.

Active Publication Date: 2017-09-29
HOHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] At present, there are few methods that can effectively monitor the initiation and propagation of cracks in cable coatings. According to thin film theory and fracture mechanics theory, there is a critical film thickness. If the film thickness is less than the critical thickness, cracks will not appear.

Method used

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  • Test method for acoustic emission detection cable coating corrosion fatigue crack initiation and growth
  • Test method for acoustic emission detection cable coating corrosion fatigue crack initiation and growth

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Embodiment Construction

[0044] The present invention will be further described in detail below in conjunction with the drawings and specific preferred embodiments.

[0045] Such as figure 1 As shown, an acoustic emission test device for detecting the initiation and propagation of corrosion fatigue cracks in cable coatings includes a fatigue testing machine 4, a tensile fixture, a corrosion tank, a corrosive medium 5, an acoustic emission monitoring system, an electronic endoscope 10 and a computer 9 .

[0046] Among them, the acoustic emission monitoring system and the electronic endoscope are both connected to the computer.

[0047] The fatigue testing machine is an existing technology and is purchased on the market. The loading waveform of the fatigue testing machine includes a sine wave, and the stress ratio of the fatigue testing machine can be adjusted.

[0048] The cable is the load-bearing component of the bridge. All the dead weight and live load of the superstructure are borne by the cable, but the ...

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Abstract

The invention relates to a test method for acoustic emission detection cable coating corrosion fatigue crack initiation and growth. The test method comprises the following steps of manufacturing a coating cable sample, searching for critical rupturing tensile force, configuring a corrosion medium, filling with the corrosion medium, clamping the coating cable sample, carrying out a fatigue test, recording a crack initiation moment, carrying out a crack growth test, evaluating a crack growth rate, drawing an S-N curve and searching for the optimal coating thickness. According to the test method provided by the invention, the crack initiation moment and the crack growth rate of the coating cable sample can be effectively monitored, the optimal coating thickness under different stress amplitudes can be found, the service life of the cable coating is prolonged, and the economic loss is reduced.

Description

Technical field [0001] The invention relates to the technical field of health monitoring of large-span structures in civil engineering structures, in particular to an acoustic emission test method for detecting the initiation and propagation of corrosion fatigue cracks in cable coatings. Background technique [0002] Cable structures are widely used in long-span bridges and building structures. As the main load-bearing and force-transmitting components, the research on the mechanical properties of cables has received increasing attention. However, the cable structure has been exposed to the natural environment and subjected to external loads for a long time. The cable structure often produces corrosion, cracking, fatigue damage and other damage patterns. Although, in actual engineering, metal protective film is coated on the cable substrate surface, such as hot-dip galvanizing, zinc-aluminum coating and titanium-silver coating, etc., the cable structure coated with metal protecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N29/14
CPCG01N3/08G01N29/14G01N2203/0073
Inventor 张华杨健王成龙王悦
Owner HOHAI UNIV
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