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A Calculation Method of High Cycle Fatigue Damage Behavior of CA Mortar for Slab Ballastless Track

A slab ballastless track, high cycle fatigue technology, applied in the field of track fatigue damage behavior, can solve the problem of full decoupling method without considering the influence of damage stress-strain distribution, calculation result error and so on

Active Publication Date: 2021-08-17
SOUTHWEST JIAOTONG UNIV +1
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing full decoupling method for the fatigue damage analysis of CA mortar does not consider the influence of damage on the stress-strain distribution, and the calculation results will produce certain errors after the fatigue damage has accumulated for a period of time. A Calculation Method for High Cycle Fatigue Damage Behavior of CA Mortar in Slab Ballastless Track

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  • A Calculation Method of High Cycle Fatigue Damage Behavior of CA Mortar for Slab Ballastless Track
  • A Calculation Method of High Cycle Fatigue Damage Behavior of CA Mortar for Slab Ballastless Track
  • A Calculation Method of High Cycle Fatigue Damage Behavior of CA Mortar for Slab Ballastless Track

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[0054] Exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be understood that the implementations shown and described in the drawings are only exemplary, intended to explain the principle and spirit of the present invention, rather than limit the scope of the present invention.

[0055] The embodiment of the present invention provides a calculation method for high cycle fatigue damage behavior of CA mortar of slab ballastless track, such as figure 1 As shown, the following steps S1-S6 are included:

[0056] S1. Obtain the CA mortar fatigue equation regression parameters h and b according to the CA mortar fatigue test, establish the CA mortar S-N curve, and obtain the CA mortar high-cycle fatigue damage increment based on the Palmgren-Miner criterion.

[0057] German The concept of S-N curve (relationship curve between stress level and fatigue life) was proposed for the first time and has been ...

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Abstract

The invention discloses a calculation method for high-cycle fatigue damage behavior of CA mortar of a slab ballastless track. The fatigue equation of the CA mortar obtained in the test is introduced into the damage constitutive relationship of the CA mortar, and embedded in the CRTS I-type slab ballastless track. In the refined simulation calculation model, the mutual coupling between the stress field and the damage field is realized, and a set of high-cycle fatigue damage calculation model for CRTS I-type slab ballastless track CA mortar based on damage-finite element full coupling technology is built. The invention better explains the interaction mechanism between structural damage and structural force, and can be easily extended to the high-cycle fatigue damage analysis of various functional parts of ballastless track, providing a solution to the fatigue damage problem of ballastless track and its prevention and improvement. The work provides theoretical guidance.

Description

technical field [0001] The invention belongs to the technical field of track fatigue damage behavior, and in particular relates to the design of a calculation method for high cycle fatigue damage behavior of CA mortar of slab ballastless track. Background technique [0002] CRTS I-type slab ballastless track is one of the main track types of high-speed railways and passenger dedicated lines in my country. It has good stability and smoothness, low building height, simple construction and good vibration reduction effect. The track structure is mainly composed of steel rails, fastening system, track slab, CA mortar layer and concrete base plate. Among them, CA mortar, as one of the key components of CRTS I-type slab ballastless track, has the functions of support, load transmission, leveling and vibration reduction. [0003] Since the design life of the ballastless track is 60 years, the track will bear tens of millions or even hundreds of millions of train loads during servic...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F119/04G06F119/14G06F119/02
CPCG06F30/23G06F2119/02G06F2119/04G06F2119/14
Inventor 任娟娟邓世杰郑健龙张军辉韦凯杜威章恺尧叶文龙田晋丞刘伟杨轲昕张颖
Owner SOUTHWEST JIAOTONG UNIV
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