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A method and a system for evaluating fatigue reliability of a weld seam of a rail vehicle body

A rail vehicle and reliability technology, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems that cannot be directly applied to multiaxial fatigue strength evaluation of welds

Pending Publication Date: 2019-01-11
TONGJI UNIV +1
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing finite element software calculates mostly the stress under fixed coordinates, which cannot be directly applied to the multiaxial fatigue strength evaluation of welds, and requires coordinate system conversion in post-processing or secondary development programs for stress result processing

Method used

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  • A method and a system for evaluating fatigue reliability of a weld seam of a rail vehicle body
  • A method and a system for evaluating fatigue reliability of a weld seam of a rail vehicle body
  • A method and a system for evaluating fatigue reliability of a weld seam of a rail vehicle body

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Embodiment

[0047] The invention relates to a method for evaluating the fatigue reliability of rail vehicle body welds, such as figure 1 As shown, the method includes the following steps:

[0048] Step 1. According to the three-dimensional geometric model of the car body, Hypermesh is used to establish a finite element model mainly composed of plate and shell elements, and the joint connection method of common nodes is used to simulate the welding between car body profiles or plates.

[0049] Step 2: refine the local mesh of the weld as required, and apply impact fatigue load to the vehicle.

[0050] Step 3: Determine the position of the weld seam on the car body, select key points for fatigue assessment of the weld seam, and select the corresponding weld seam quality grade according to the actual weld seam form and gap state.

[0051] Step 4: At the evaluation key point, take the direction parallel to the weld seam as the X axis, perpendicular to the weld seam, and establish a local coord...

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Abstract

The invention relates to a method and a system for evaluating fatigue reliability of a weld seam of a rail vehicle body. The invention applies a fatigue impact load to the rail vehicle body through afinite element method, directly calculates the stress of a weld coordinate system, obtains a node stress file, and evaluates the fatigue reliability of the weld of the vehicle body by combining the evaluation key point file and the node stress file. Compared with the prior art, the present invention solves the problem that the stress obtained by the prior finite element method is mostly under thefixed coordinate, which can not be directly applied to the multiaxial fatigue strength evaluation of the weld seam, and the coordinate system conversion in the post-processing or the stress result processing by the secondary development program are required.

Description

technical field [0001] The invention relates to the technical field of rail transit equipment design and evaluation, in particular to a method and system for evaluating fatigue reliability of rail vehicle body welds. Background technique [0002] The aluminum alloy body of rail vehicles has the characteristics of light weight, sound insulation, heat insulation, etc., and is widely used in urban rail transit. Urban rail vehicles are subjected to complex longitudinal, lateral, torsional and track impact loads during operation, so the assessment of car body fatigue strength is an important indicator of car body reliability design. After the aluminum alloy is welded, the strength of the weld seam and the heat-affected zone will be greatly reduced, and there are various defects and stress concentrations in the weld seam, the fatigue strength of the weld seam will be far less than that of the base metal, so , the fatigue strength of the weld will be the main assessment object. ...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 王文斌冀温源赵红伟田洪雷户迎灿杜健
Owner TONGJI UNIV
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