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Simulation analysis method of wheel-rail contact cycle loading and unloading based on finite element simulation

A simulation analysis and finite element technology, applied in the theoretical and practical field of computer simulation of wheel-rail contact, can solve problems such as the implementation method of the wheel-rail circulation action has not yet been described, the influence of boundary effects is not considered, and it is difficult to eliminate errors.

Inactive Publication Date: 2021-04-09
SOUTHWEST JIAOTONG UNIV
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AI Technical Summary

Problems solved by technology

The wheel-rail contact analysis needs to evaluate the smooth running state of the vehicle. The previous finite element wheel-rail cycle simulation has not considered the boundary effect caused by loading and unloading, so it is difficult to eliminate the error
In addition, there is no relevant description of the implementation method of wheel-rail circulation

Method used

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  • Simulation analysis method of wheel-rail contact cycle loading and unloading based on finite element simulation
  • Simulation analysis method of wheel-rail contact cycle loading and unloading based on finite element simulation
  • Simulation analysis method of wheel-rail contact cycle loading and unloading based on finite element simulation

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Embodiment Construction

[0022] The present invention will be described in detail below in conjunction with the accompanying drawings and examples.

[0023] The invention provides a wheel-track contact cycle loading-unloading simulation analysis method based on finite element simulation, and its operation flow is as follows figure 1 As shown, the specific steps are as follows:

[0024] (1) Using the finite element software ABAQUS, establish a dog-bone type smooth cylindrical sample model, the diameter of the cylinder is 14mm, and the length of the cylinder is 25.4mm, such as figure 2 As shown in (a); the vertical stress and strain of the internal unit of the cylinder are monitored, and the real stress-strain curve is drawn. The vertical strain contours of multiple loadings are shown in 2(b).

[0025] (2) Carry out uniaxial tension-compression cycle test simulation, and correct the nonlinear hardening parameters of the material according to the laboratory test results and the Chaboche model. The ke...

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Abstract

A finite element simulation-based cyclic loading and unloading simulation method for wheel-rail contact, the main steps are as follows: (a) use the finite element software ABAQUS to establish a uniaxial tension-compression axisymmetric model; (b) perform uniaxial tension-compression cycle test simulation, And according to the laboratory test results and the Chaboche model, the nonlinear hardening parameters of the material are corrected; (c) the wheel-rail contact model is established, and the material parameters and contact parameters are set; (d) the single cycle is decomposed into loading stages, stable Rolling stage and unloading stage are three stages, and the loading conditions, constraint conditions, contact conditions and boundary conditions are set respectively; (e) use the restart mechanism to import the last calculation results, and on this basis, the wheel-rail contact loading-unloading simulation , and save the results of the unloading phase as the initial conditions for the next cycle. The invention is based on the nonlinear finite element simulation method and the theory of contact mechanics, and can simulate and analyze the cyclic loading and unloading behaviors of wheel-rail fatigue and damage.

Description

technical field [0001] The invention relates to the field of rail traffic safety research, and relates to a theoretical and practical computer simulation method for wheel-rail contact. Background technique [0002] At present, rail transit systems such as subways and high-speed rails have achieved rapid development and large-scale construction in my country. How to evaluate the safety and reliability of the wheel-rail system during the service period is the main problem faced by my country's rail transit safety field. The finite element simulation technology after parameter correction can realize the simulation calculation of wheel-rail contact under various working conditions. A reliable predictive tool for wear analysis. Due to the limitations of software and hardware computing performance and storage performance, wheel-rail contact simulation still has defects such as large-scale, complex models that are difficult to run, and cyclic loading and unloading. [0003] With...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F30/17G06F30/15
CPCG06F30/23
Inventor 王建杨长卫黄艺丹孙晓丹
Owner SOUTHWEST JIAOTONG UNIV
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