Weld joint fatigue life prediction method

A technology of fatigue life prediction and fatigue life, which is applied in special data processing applications, instruments, electrical digital data processing, etc., and can solve problems such as the inconsistency between the simulated force and the actual situation, and low prediction accuracy

Active Publication Date: 2016-07-06
HUNAN UNIV
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Problems solved by technology

[0004] Aiming at the problems existing in the existing welding seam fatigue life prediction method that the simulated force does not match the actual situation and the prediction accuracy is low,...

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  • Weld joint fatigue life prediction method

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Embodiment 1

[0034] figure 1 The specific flow of the prediction method adopted in this embodiment is shown, which will be described in detail below.

[0035] 1. Definition and calculation of shear structural stress

[0036] First, the vehicle and weld finite element models are established based on the vehicle's 3D digital model and weld data. Using the finite element model, the linear elastic finite element software is used to directly calculate and output the nodal force and moment of each node on the weld in the global coordinate system (the keyword GPFORCE is defined for the NASTRAN software), and then transformed into local parameters of each node through coordinate transformation Nodal forces and moments in the coordinate system. figure 2 Among them, (x, y, z) is the global coordinate system, and (x′, y′, z′) is the local coordinate system.

[0037] The nodal force and moment in the local coordinate system of the weld are converted into nodal linear force and moment f according t...

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Abstract

The invention provides a weld joint fatigue life prediction method, which comprises the following steps of obtaining node force and moment of a weld joint unit node through analysis by finite element software; then, according to the identical power application principle, obtaining the corresponding linear force and moment through the calculation by the node force and the moment of the weld joint unit node; obtaining the normal structure stress and the shearing structure stress in the thickness direction of the weld joint through conversion calculation; performing correction according to the actual expansion angle of cracks in the thickness direction; obtaining a corresponding equivalent stress intensity factor through the calculation on the corrected normal structure stress and shearing structure stress, and thus obtaining an average equivalent stress intensity factor on the practical crack expansion path; and using the average equivalent stress intensity factor as an evaluation parameter of the weld joint fatigue service. The weld joint fatigue life prediction method has the beneficial effects that the solution of a large-scale matrix equation is not needed, so that the calculation efficiency is greatly improved; and the method has the advantages of high calculation efficiency and high prediction precision.

Description

technical field [0001] The invention relates to the field of welding, in particular to a high-precision fatigue life prediction method for welds. Background technique [0002] The welded structure has the advantages of high joint strength, large design flexibility, good sealing, easy processing and connection, high yield and easy automation. At present, welding is the most important connection method in engineering production, and the weight of the welded structure has accounted for It accounts for more than half of the total steel output, and this proportion is close to 70% in industrially developed countries. Welded connections are also widely used in the automotive industry and are one of the main connection methods for automobile frames and chassis. The fatigue strength of welded structures determines the durability of welded components. According to statistics, in recent years, 85% of the fatigue problems of automobile frames and chassis are related to welding structu...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/23
Inventor 宋凯程广鸣成艾国李光耀胡金花王振
Owner HUNAN UNIV
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