A method and system for estimating fatigue life of rails

A fatigue life and rail technology, applied in instrumentation, design optimization/simulation, calculation, etc., can solve problems such as rail fatigue damage, serious accidents, rail body cracks, etc., to achieve high accuracy and reduce potential safety hazards.

Inactive Publication Date: 2019-12-13
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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  • A method and system for estimating fatigue life of rails
  • A method and system for estimating fatigue life of rails
  • A method and system for estimating fatigue life of rails

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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 metallic 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 damage constitutive relationship are derived from the free energy and dissipation potential of the system, thereby forming a more rigorous mechanical system for macroscopic damage analysis, which is more accurate Reflects the damage evolution process of materials, forms a practical fatigue life prediction method, and realizes the theoretical prediction of material fatigue life.

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

[0043] ...

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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 prediction, and in particular to a method and system for rail fatigue life prediction. Background technique [0002] Modern railway transportation is developing in the direction of high speed and heavy load. The fatigue damage of rails caused by this has become more and more serious, which has become a major problem affecting railway safety. In the process of smelting and forging, steel rails will inevitably have defects in materials such as white spots, air bubbles and non-metallic inclusions. During processing and transportation, more diverse sources of mechanical damage and accumulation of damage may occur, and the wheels are in service. The repeated rolling of steel rail is prone to fatigue damage. The development of this damage accumulates the initiation and expansion of rail body cracks, which will eventually lead to serious accidents. [0003] Therefore, understanding and grasping the c...

Claims

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Application Information

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