Method and system for predicting fatigue life of steel rail

A fatigue life and life evaluation technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve problems such as rail fatigue damage, serious accidents, rail body cracks, etc., to achieve high accuracy and reduce safety hazards. Effect

Inactive Publication Date: 2016-12-07
张铮 +1
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Problems solved by technology

In the process of smelting and forging, steel rails will inevitably have material defects such as white spots, air bubbles, and non-metallic inclusions. During processing and transportation, more diverse sources of mechanical damage and damage accumulation may occur. The rails are prone to fatigue damage due to repeated rolling and rolling. The development and accumulation of this damage will cause the initiation and expansion of cracks in the rail body, which will eventually lead to serious accidents.

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  • Method and system for predicting fatigue life of steel rail
  • Method and system for predicting fatigue life of steel rail
  • Method and system for predicting fatigue life of steel rail

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Embodiment Construction

[0040] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0041] It is generally believed that the fatigue damage process of metal materials is an irreversible thermodynamic process. Damage mechanics is based on continuum mechanics and thermodynamics. According to the law of conservation of energy, the damage evolution equation and the damage constitutive relation are derived from the free energy and dissipation potential of the system, thus forming a more rigorous macroscopic damage analysis mechanical system, which is more accurate It reflects the damage evolution process of the material, forms a practical fatigue life prediction method, and realizes the theoretical prediction of the fatigue life of the material.

[0042] The first law of thermodynamics characterizes the conservation of energy and can be written as:...

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Abstract

The invention provides a method for predicting the fatigue life of a steel rail. According to the method, a steel rail testing area is selected, a damage mechanics method is taken as a basis, damage evolution equation parameters of damage mechanics are determined according to an S-N curve of material fatigue, a theoretical life assessment method of damage mechanics is subjected to secondary development on a commercial finite element software platform, a function module for fatigue life assessment of the steel rail is formed, and theoretical assessment of the fatigue life of the steel rail is obtained through calculation by the aid of a finite element model. With the implementation of the method and the system, the fatigue life of the steel rail can be theoretically predicted, higher accuracy is realized, and the purpose of reducing potential safety hazards during use of the steel rail can be achieved.

Description

technical field [0001] The invention relates to the technical field of rail fatigue life estimation, in particular to a method and system for rail fatigue life estimation. Background technique [0002] Modern railway transportation is developing towards high-speed and heavy-loading, and the resulting problem of rail fatigue damage has become more and more serious, which has become a major problem affecting railway safety. During the smelting and forging process of the rail, there will inevitably be defects in materials such as white spots, bubbles and non-metallic inclusions. During the processing and transportation process, there may be more diverse sources of mechanical damage and damage accumulation. In addition, the wheels are in service. The repeated rolling of the rail is prone to fatigue damage. The development and accumulation of this damage will cause the initiation and expansion of rail cracks, which will eventually lead to serious accidents. [0003] Therefore, i...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00G06F17/50
CPCG06F30/23G16Z99/00
Inventor 张铮杨德林刘磊
Owner 张铮
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