Method and device for calculating fatigue life of vehicle welding lines

A technology of fatigue life and calculation method, applied in the field of machinery, can solve the problem of large error in the analysis data of weld fatigue life

Inactive Publication Date: 2014-06-04
CRRC TANGSHAN CO LTD
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  • Abstract
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Problems solved by technology

[0004] The present invention provides a method and device for calculating the fatigue life of a welded seam of a car body, in order to overcome the problem in the prior art that the analysis data of the fatigue life of the welded seam obtained by the nominal stress method has relatively large errors

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  • Method and device for calculating fatigue life of vehicle welding lines
  • Method and device for calculating fatigue life of vehicle welding lines
  • Method and device for calculating fatigue life of vehicle welding lines

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Embodiment Construction

[0038] figure 1 It is a flow chart of Embodiment 1 of the method for calculating the fatigue life of a car body weld seam according to the present invention. figure 2 It is a schematic diagram of the car body weld in the first embodiment of the method of the present invention Figure 1 . image 3 It is a schematic diagram of weld joints in Embodiment 1 of the method of the present invention. Such as figure 1 As shown, the method of this embodiment may include:

[0039] Step 101, obtaining the loads of the vehicle body under different fatigue strength conditions.

[0040] Specifically, the application object of the embodiment of the present invention can be the high-speed train aluminum alloy TC intermediate car body model CRH3-380. Based on the car body online test standard, the loads of the car body under different fatigue strength conditions on the actual line are obtained, as follows Table 1 shows:

[0041] Table 1 Load list of car body under different fatigue streng...

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Abstract

The invention provides a method and device for calculating the fatigue life of vehicle welding lines. The method for calculating the fatigue life of the vehicle welding lines comprises the step of acquiring the loads of a vehicle under different fatigue strength working conditions, the step of establishing a finite element model comprising the joints of the vehicle welding lines according to the geometric model of the vehicle, the step of loading the loads into the finite element model to calculate the structural stress of the welding lines, and the step of calculating the fatigue life of the welding lines according to the structural stress. By means of the method, the fatigue life of the welding lines of the vehicle made of aluminum alloy is calculated, the main factors affecting the fatigue resistance of the welding lines of the vehicle made of the aluminum alloy are shown through a structural stress body, and the problem that fatigue life analysis data errors of the welding lines are large through the nominal stress method in the prior art is solved.

Description

technical field [0001] The invention relates to mechanical technology, in particular to a method and device for calculating the fatigue life of a welded seam of a car body. Background technique [0002] As my country's high-speed railways continue to be put into operation, the reliability of high-speed EMUs is facing challenges. The welded frame of the car body is the part that needs the most attention. The general failure of the welded frame is fatigue damage at the weld in the welded structure. [0003] The aluminum alloy car body of high-speed trains has a complex structure, a large number of welds, and complex positional relationships between welds. At present, there are few fatigue life assessments for welded seams of high-speed train bodies, and some are only standards for fatigue analysis of welded structures based on the nominal stress method, such as: British BS7608, except that the classification of welded joints in engineering applications is difficult to grasp. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F19/00
Inventor 王贵国黄振晖蒋大旺李荣亮郭云健谈立成
Owner CRRC TANGSHAN CO LTD
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