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Finite element simulation-based wheel-track contact cyclic loading-unloading simulation analysis method

A simulation analysis and finite element technology, applied in the theoretical and practical computer simulation field of wheel-rail contact, which can solve the problems such as the lack of a description of the implementation method of the wheel-rail circulation action, the lack of consideration of the influence of boundary effects, and the difficulty in eliminating errors.

Inactive Publication Date: 2018-10-16
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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  • Finite element simulation-based wheel-track contact cyclic loading-unloading simulation analysis method
  • Finite element simulation-based wheel-track contact cyclic loading-unloading simulation analysis method
  • Finite element simulation-based wheel-track contact cyclic loading-unloading simulation analysis method

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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

The invention discloses a finite element simulation-based wheel-track contact cyclic loading-unloading simulation analysis method. The method comprises the following main steps of (a) building a uniaxial tension and compression axial symmetric model by utilizing finite element software ABAQUS; (b) performing uniaxial tension and compression cyclic test simulation, and according to an indoor test result and a Chaboche model, performing correction on a nonlinear hardening parameter of a material; (c) building a wheel-track contact model, and setting material parameters and contact parameters; (d) decomposing a single-time cycle into three stages including a loading stage, a stable rolling stage and an unloading stage, and setting a loading condition, a constraint condition, a contact condition and a boundary condition; and (e) by utilizing a restart mechanism, importing a previous calculation result, performing wheel track contact loading-unloading simulation based on this, and storing an unloading stage result to serve as an initial condition of the next cycle. Based on a nonlinear finite element simulation method and a contact mechanic theory, cyclic loading and unloading behaviorsof wheel track fatigue, damage and the like can be subjected to simulation analysis.

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 Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 王建杨长卫黄艺丹孙晓丹
Owner SOUTHWEST JIAOTONG UNIV
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