Determination method of cable steel wire corrosion fatigue damage law, application, device and fixture

A technology for corrosion fatigue and measurement methods, which is applied in the direction of measuring devices, weather resistance/light resistance/corrosion resistance, and the use of repeated force/pulsation force to test the strength of materials, etc., which can solve problems such as weak resistance loss, failure, and wear of insulating materials

Active Publication Date: 2019-07-23
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the weak resistance loss, a high-precision resistance measuring instrument is required. If this method is used in the corrosion fatigue test, it is necessary to consider the insulation treatment of the test instrument. Because the diameter of the high-strength steel wire is too small, the surface is coated with insulating materials. The method will fail due to the shear damage of the jaws of the fatigue testing machine, and if the insulating material is applied to the surface of the fixture, it is prone to random failure of the insulating material due to wear and tear. Therefore, it is necessary to propose an effective and continuous insulation measure to solve the corrosion problem. During the fatigue process, the influence of the fatigue testing machine on the measured value

Method used

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  • Determination method of cable steel wire corrosion fatigue damage law, application, device and fixture
  • Determination method of cable steel wire corrosion fatigue damage law, application, device and fixture
  • Determination method of cable steel wire corrosion fatigue damage law, application, device and fixture

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Embodiment 1

[0053] A method for measuring the corrosion fatigue damage law of cable steel wire,

[0054] Step 1 Get relevant parameters

[0055] Extract the real bridge cable steel wire environmental spectrum, cable static stress value and stress time history spectrum including temperature, humidity and corrosive ion concentration parameters within a period of working time T under service conditions. Among them, corrosive ions mainly refer to The ions that can significantly promote the electrochemical reaction of corrosion are generally Cl - or SO 3 2- ; The extraction process of the steel wire environmental spectrum of the real bridge cable is as follows: the temperature and humidity during this period are obtained by setting a temperature and humidity sensor near the real bridge cable, and whether the corrosive ion concentration can be determined according to the water or rain in the sheath; the static stress of the cable The extraction process of the value is: according to the design ...

Embodiment 2

[0092] Application of a method for determining the corrosion fatigue damage law of cable steel wires in the estimation of the remaining service life of cable steel wires in real bridges. The remaining service life of cable steel wires in real bridges is N f，CFT -N CFT , N f，CFT is the number of cycles when the real bridge cable steel wire obtained in claim 1 breaks, N CFT is the current number of cycles, and the current resistance of the steel wire of the real bridge cable is measured by using a high-precision resistance measuring instrument, and the change value of the current resistance ΔR is calculated to determine the current number of cycles N CFT .

Embodiment 3

[0094] A device for measuring the fatigue damage law of cable steel wire corrosion, including a double-layer corrosion chamber 1, a salt spray chamber 2, a high-precision resistance tester 4, a constant temperature chamber 5, and a fatigue testing machine. The double-layer corrosion chamber 1 is composed of an inner chamber and a package The inner chamber is composed of an annular outer chamber, the upper and lower ends of the inner chamber are respectively provided with via holes for inserting the steel wire to be tested, and the upper part of the inner chamber is provided with an inner chamber salt spray inlet 1-1 and The overflow port 1-2 is provided with an inner chamber corrosive liquid inlet 1-6 which is also used for emptying the fluid in the inner chamber at the lower part of the inner chamber, and a plug-in temperature and humidity sensor 2-3 is arranged in the inner chamber. The upper part of the annular outer chamber is provided with an outer chamber overflow port 1-...

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Abstract

The invention discloses a determination method of a cable steel wire corrosion fatigue damage law, application, a device and a fixture. Four parts of specific content are involved, wherein the first part is the corrosion fatigue damage law acquisition method which comprises the steps that a corrosion fatigue test is performed by processing an environment spectrum and a load spectrum of service conditions, a resistance method is used to measure corrosion fatigue test general damage and stress corrosion damage, the difference value between the two types of damage is corrosion fatigue damage, andthe law of the damage is fitted by use of a formula; the second part is the application of the corrosion fatigue damage law, wherein after the test law is obtained, a high-precision resistance measuring instrument is used to test current resistance, and then residual life can be obtained; the third part is the device used for determining the damage law, wherein the device comprises a double-layercorrosion cavity, a salt mist box, the high-precision resistance measuring instrument, a constant-temperature box and a fatigue testing machine; and the fourth part is the insulated fixture used forpreventing interference of equipment on resistance testing. Through combined use of the four parts, reasonable residual life of a cable steel wire in a complicated environment can be given, and convenience is brought to engineering practice.

Description

technical field [0001] The invention is used to analyze the damage evolution law of high-strength steel wires of real bridges under different service conditions under the corrosion fatigue coupling mechanism, and specifically relates to a method, application, device and fixture for measuring the corrosion fatigue damage law of cable steel wires. Background technique [0002] Bridges with cable load-bearing systems mainly include various suspension rod arch bridges, cable-stayed bridges, and suspension bridges. Most of their service environments are coastal or inland lakes. High humidity, high salinity, and high temperature exposure will cause premature aging of the cable protection system. Cracking, thereby allowing the internal cable body (parallel wire cables, steel strand cables, closed steel cables, etc.) to enter the corrosion stage. Due to the decline in durability of the bridge due to corrosion, the huge late cost has become a factor that cannot be ignored by bridge d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/32G01N3/02G01N3/04G01N3/06G01N17/00
CPCG01N3/32G01N3/02G01N3/04G01N3/066G01N17/006G01N2203/0005G01N2203/0073G01N2203/024G01N2203/0617
Inventor 郭彤余夏明邹翼
Owner SOUTHEAST UNIV
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