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Acoustic Emission Test Method for Detecting Corrosion Fatigue Crack Initiation and Propagation in Cable Coatings

A technology of corrosion fatigue, test method, applied in the direction of material analysis using acoustic wave emission technology, testing material strength using applied stable tension/compression, measuring devices, etc.

Active Publication Date: 2020-04-21
HOHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Acoustic Emission Test Method for Detecting Corrosion Fatigue Crack Initiation and Propagation in Cable Coatings
  • Acoustic Emission Test Method for Detecting Corrosion Fatigue Crack Initiation and Propagation in Cable Coatings

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Embodiment Construction

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

[0045] Such as figure 1 As shown, a test device for acoustic emission detection of corrosion fatigue crack initiation and expansion of cable coating, including fatigue testing machine 4, tensile fixture, corrosion tank, corrosion medium 5, acoustic emission monitoring system, electronic endoscope 10 and computer 9 .

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

[0047] The fatigue testing machine is prior art and is purchased in 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] As the load-bearing component of the bridge, the cable is responsible for all the self-weight and live load of the superstructure, but the live-to-constant rat...

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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 a test method for acoustic emission detection of initiation and expansion 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 their mechanical properties has received increasing attention. However, the cable structure has been exposed to the natural environment and has been subjected to external loads for a long time. The cable structure often suffers from corrosion, cracking, fatigue damage and other damage forms. Although, in actual engineering, a metal protective film is coated on the surface of the cable substrate, such as hot-dip galvanizing, zinc-aluminum coating, and titanium-silver coating, etc., the cable structure coated with a...

Claims

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Application Information

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Patent Type & Authority Patents(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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