Numerical analysis method for rail rolling contact fatigue cracks in abaqus
A technology of rolling contact fatigue and numerical analysis, which is applied to the analysis of materials, the use of stable tension/pressure to test the strength of materials, instruments, etc., can solve problems such as increased maintenance costs and inaccurate detection methods for track cracks, and reduce maintenance costs. Effect
Active Publication Date: 2022-01-07
XIAN UNIV OF TECH
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[0004] The purpose of the present invention is to provide a numerical analysis method for rail rolling contact fatigue cracks in ABAQUS, which solves the problem that the detection method of rail cracks in the prior art is not accurate enough, resulting in a significant increase in maintenance costs
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[0102] Taking the 75kg / m track as an example, the track length is 12.5m, and the material is U78CrV steel. The specific parameters of the material are shown in Table 1 below; the diameter of the wheel is 1250mm, and the material is CL65 steel. During the contact process between the wheel and the track, the track bears a pressure load of 95000N, and the maximum contact stress p on the track can be calculated according to the Hertz theory max =847Mpa, contact half-width b=7.3mm.
[0103] The parameter of table 1, embodiment
[0104]
[0105] According to the above-mentioned process setting of the inventive method, at first, utilize Neper to set up the track finite element microscopic model of 75kg / m type track mosaic Voronoi and cohesive force unit, and import in ABAQUS, then, according to the working condition that track contacts with wheel, in ABAQUS Restrict all degrees of freedom at the bottom of the track, and set the track contact traction coefficient u = 0.3; press ...
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Abstract
The invention discloses a numerical analysis method for rail rolling contact fatigue cracks in ABAQUS. The steps include: 1) establishing a track finite element microscopic model; 2) importing the model to generate an ABAQUS track calculation model; 3) collecting and initializing parameters, and setting the track Calculate the boundary conditions of the model; 4) Set the analysis step and incremental step in ABAQUS; 5) Calculate the material damage performance; 6) Load the track calculation model; 7) Analyze the stress amplitude and strain of the cohesive force element; 8) Analyze the damage of the cohesive force element; 9 ) to judge whether the cohesion unit is invalid; 10) to revise the ABAQUS calculation model. The method of the present invention utilizes the UMAT subroutine of ABAQUS to realize the numerical analysis of the fatigue damage failure of the cohesive force unit, realizes the simulation analysis of the fatigue crack initiation and expansion of the track under rolling contact in ABAQUS, and predicts the reliability of the track.
Description
technical field [0001] The invention belongs to the technical field of structural fatigue crack monitoring, and relates to a numerical analysis method for rail rolling contact fatigue cracks in ABAQUS. Background technique [0002] The track surface cracks caused by rolling contact are the main problem of high-speed railway safety. The train wheels are constantly in rolling contact with the track. Expansion eventually leads to failure of track material and fracture, causing train derailment accidents. Fatigue cracks on the surface of the track directly affect the reliability of the safe operation of the railway. However, the detection and maintenance costs of track cracks are very high. Therefore, it is necessary to predict the location of track crack initiation and the number of cycles for cracks to grow to a dangerous length of load, so as to formulate correct maintenance. Strategies to reduce railway maintenance costs have become a research hotspot in railway enterprises...
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IPC IPC(8): G01N3/08
CPCG01N3/08G01N2203/0066G01N2203/0202G01N2203/0073
Inventor 杨静胡志伟
Owner XIAN UNIV OF TECH