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Experimental device and method for simulating fretting friction crevice corrosion of rail foot of train rail

A technology for simulating trains and fretting friction. It is used in measuring devices, weather resistance/light resistance/corrosion resistance, instruments, etc. It can solve the problems of unreasonable design of crevice corrosion simulation experimental devices, inability to realize fretting friction, etc. , Simple operation, good simulation effect

Pending Publication Date: 2022-06-03
INST OF OCEANOLOGY - CHINESE ACAD OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an experimental device and method for simulating the fretting friction crevice corrosion of the rail foot of the train track, aiming to solve the problem that the crevice corrosion simulation experimental device in the prior art is unreasonably designed and cannot realize the fretting friction and thus cannot truly simulate the train track The problem of the service condition of the rail foot and fastener system in the gap

Method used

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  • Experimental device and method for simulating fretting friction crevice corrosion of rail foot of train rail
  • Experimental device and method for simulating fretting friction crevice corrosion of rail foot of train rail
  • Experimental device and method for simulating fretting friction crevice corrosion of rail foot of train rail

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] See attached figure 1 , attached figure 2 , attached image 3 , attached Figure 4 , attached Figure 5 and attached Image 6 The invention provides an experimental device for simulating the fretting friction crevice corrosion of the rail foot of the train track. The crevice corrosion caused by fretting friction is used to study and evaluate the crevice corrosion resistance of train track materials under actual service conditions. Specifically, it is a kind of rail foot and fastener system used to simulate the train track. A simulation experimental device for crevice corrosion caused by fretting friction at the contact surface caused by micro vibration when the gap formed by the insulating gauge baffle of the train passes by. This experimental device for simulating the fretting friction crevice corrosion of rail feet of a train includes a frame 10, an electrochemical reaction cell 20, an actuator 30 and an elastic member 40; The two side plates 12 and the top pla...

Embodiment 2

[0055] In the present invention, the test sample 18 is made of U75V rail steel material. A piece of cylindrical material is cut from the rail foot of the U75V rail steel. The diameter of the test sample 18 is 2cm and the height is 1.5cm. The test sample 18 is installed vertically In the third socket 16; the test fastener 23 is made of polyamide 66, and a piece of polyamide 66 (ie PA66) is selected to make a cylindrical shape. Polyamide 66 is a typical material for insulating gauge baffles. The diameter of 23 is 2.5 cm and the length is 3 cm. The diameter of the test fastener 23 is slightly larger than the diameter of the test sample 18 , and the test fastener 23 is vertically installed in the groove 24 of the cell body 22 .

[0056] In the present invention, the electrochemical reaction cell 20 is made of PEEK plastic, which has high hardness, strong rigidity, and small deformation when subjected to pushing and pulling force. The groove 24 has a diameter of 2.5 cm and a depth ...

Embodiment 3

[0066] An experimental method for simulating the fretting friction crevice corrosion of rail feet of a train of the present invention comprises the following steps:

[0067] 1) Add 0.1M NaCl solution in the electrochemical reaction tank in the experimental device for simulating the fretting friction crevice corrosion of the rail foot of the train according to the first embodiment, so that the liquid level is higher than the test sample 18 and the test fastener 23. The gap between the two is 2mm, and the experimental device is started;

[0068] 2) Set the vibration frequency of the actuator 30 as f 1 , f 1 =0.5Hz, set the vibration displacement of the actuator 30 as s 1 , s 1 = 50 μm, set the pressure applied by the pressing element 51 to the test sample 18 as N 1 , N 1 =500N, observe and record the open circuit potential change of the test sample 18 through the electrochemical workstation;

[0069] 3) Adjust the vibration frequency of the actuator 30 to be f 2 , f 2 =0...

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Abstract

The invention provides an experimental device and method for simulating fretting friction crevice corrosion of a rail foot of a train rail. The device comprises a frame, an electrochemical reaction tank, an actuator and an elastic piece, a reference electrode, a counter electrode and a test sample are arranged on the frame, and the top of the test sample is connected with a pressure applying element; the electrochemical reaction tank is horizontally and slidably arranged on the bottom plate, a test fastener is arranged in the electrochemical reaction tank, and the test sample abuts against the test fastener; the actuator is arranged on one side of the electrochemical reaction tank, and the elastic piece is arranged on the other side, opposite to the actuator, of the electrochemical reaction tank. The test sample and the test fastener form a friction pair, the pressure applying element applies pressure to the test sample to simulate the pressure of the fastener to the track, and the promoter pushes and pulls the electrochemical reaction tank to drive the test fastener to do small-displacement reciprocating rectilinear motion to simulate the fretting friction motion when a train passes. When the actuator does not work, the static state of the train away from the rail is simulated, and the real service condition of the fastener and the rail foot at the gap is truly represented.

Description

technical field [0001] The invention relates to the technical field of crevice corrosion testing, in particular to an experimental device and method for simulating the fretting friction crevice corrosion of a rail foot of a train. Background technique [0002] Train tracks, also known as train tracks or railway tracks, referred to as rails, rails, rails, etc., are mainly used on railways and cooperate with point switches to enable trains to walk without turning. The railway track is usually composed of two parallel steel rails, the steel rails are fixed on the sleepers, and the ballast is under the sleepers. Fasten. The train track is fixed by the downforce provided by the fastener system, wherein the fastener covers the upper surface of the rail foot, and the elastic strip provides downward elastic force, thereby fixing the train track. [0003] Insulating gauge baffles are often placed between the spring bars and the rail feet, which can avoid galvanic corrosion and effe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N17/00G01N17/02
CPCG01N17/006G01N17/02
Inventor 徐玮辰王建张斌斌张杰杨黎晖彭中波
Owner INST OF OCEANOLOGY - CHINESE ACAD OF SCI