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Multi-axial fatigue calculation method for complex working conditions of frame including welding simulation

A technology of welding simulation and complex working conditions, applied in the field of fatigue calculation, can solve the problems of saving resources, social progress, repeated research and development, disadvantages, etc., and achieve the effects of avoiding repeated research and development, improving accuracy and saving resources

Active Publication Date: 2018-01-09
CHINA AUTOMOTIVE ENG RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the existing technology, the setting of the fatigue load spectrum is a confidential technology of the vehicle development unit and is not disclosed. There is a problem of repeated research and development, which is not conducive to saving resources and promoting social progress.

Method used

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  • Multi-axial fatigue calculation method for complex working conditions of frame including welding simulation
  • Multi-axial fatigue calculation method for complex working conditions of frame including welding simulation
  • Multi-axial fatigue calculation method for complex working conditions of frame including welding simulation

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Experimental program
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Effect test

Embodiment 1

[0036] Embodiment 1, a method for calculating multi-axis fatigue under complex working conditions of frame overturning moment fatigue including welding simulation, comprising the following steps:

[0037] S1, grouping of welding units and structural units: set the spatial coordinate system of X, Y, Z and coordinate origin, and group welding units and structural units;

[0038] S2, finite element welding simulation: perform finite element welding simulation on sheet metal welding and surface welding in the form of fillet welds; among them, the welding unit adopts a quadrilateral grid with a side length of 3 to 5mm; the warpage of the grid is less than 5%; there is no triangular mesh in the weld layer, and the proportion of triangular mesh in the grid units of the welded connection layer adjacent to the weld layer is less than 5%; it is best that there is no mesh at the beginning and end of the fillet weld Curved elements and triangular mesh elements, the edges of the weld layer...

Embodiment 2

[0045]Embodiment 2, a multi-axial fatigue calculation method for S-shaped steering tilting fatigue complex working conditions including welding simulation, including S1 welding unit and structural unit grouping; S2 finite element welding simulation; S3 complex working condition definition; S4 multi-axis establishment and S5 multiaxial fatigue calculation steps;

[0046] Among them, the definition of complex working conditions includes defining S-shaped steering overturning fatigue loads and fatigue cycle conditions; the fatigue loads include the size, direction and loading position of the load; the fatigue load size of the S-shaped steering overturning fatigue conditions , direction, loading position and other load parameters can be obtained through the snake test to obtain the attitude parameters of the vehicle, that is, the pitch, lateral bending angle, tipping moment and acceleration parameters; the simulation parameters can also be obtained by multi-body dynamics software; ...

Embodiment 3

[0049] Embodiment 3, a multi-axis fatigue calculation method for continuous brake tilting fatigue complex working conditions including welding simulation, including S1 welding unit and structural unit grouping; S2 finite element welding simulation; S3 complex working condition definition; S4 multi-axis establishment and S5 multiaxial fatigue calculation steps;

[0050] Among them, the definition of complex working conditions includes the definition of S-shaped steering overturning fatigue loads and fatigue cycle conditions; the fatigue load includes the magnitude, direction and loading position of the load; wherein, the fatigue load size of the continuous brake overturning fatigue condition , direction, and loading position are, in order to load the mechanical parameters of eight loads including the braking force and torque of the front left, front right, rear right, and rear left wheels on the connection position between the frame and the suspension, and ensure that the force ...

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Abstract

The invention discloses a multi-axis fatigue calculation method for frame complex working conditions including welding simulation, including the steps of welding and structural unit grouping, finite element welding simulation, complex working condition definition, multi-axis establishment and multi-axis fatigue calculation; , the definition of complex working conditions includes defining the magnitude, direction, loading position of fatigue load and any fatigue cycle working condition including overturning moment fatigue, S-shaped steering fatigue, continuous braking fatigue, torsional fatigue, and multi-degree-of-freedom vibration fatigue; The multi-axis establishment includes establishing at least two fatigue life axes according to the defined fatigue load and fatigue cycle conditions; the multi-axis fatigue calculation includes using the fatigue life calculation software to establish The calculation channel corresponding to the number of fatigue life axes performs multi-channel multi-axis fatigue life calculation. The beneficial effect of the invention is that the calculation of the fatigue life is accurate, and the disclosure of the method can avoid repeated research and development, which is beneficial to saving resources and promoting social progress.

Description

technical field [0001] The invention relates to a fatigue calculation method in the design stage of a vehicle frame, in particular to a multi-axis fatigue calculation method for a complex working condition of a vehicle frame including welding simulation. Background technique [0002] The frame is the main load-bearing part of a car, especially for a truck. Some box-shaped structures are welded between the beam and the longitudinal beam of the frame to strengthen the overall strength of the frame. The frame of a general car is composed of two The longitudinal beams on both sides and several beams are composed, and the fatigue life of the frame can be determined by the bench test of the actual frame. In order to reduce the development cost and shorten the development cycle, it is necessary to carry out design verification through the fatigue life calculation software in the design stage of the vehicle, and the working condition simulation and parameter setting must be carried ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F19/00
Inventor 苏锦涛
Owner CHINA AUTOMOTIVE ENG RES INST
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