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Frame complex work condition multi-axial fatigue calculation method including welding simulation

A technology for 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., to avoid repeated research and development, improve accuracy, and save resources.

Active Publication Date: 2015-03-25
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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  • Frame complex work condition multi-axial fatigue calculation method including welding simulation
  • Frame complex work condition multi-axial fatigue calculation method including welding simulation
  • Frame complex work condition multi-axial fatigue calculation method including welding simulation

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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 welding connection layer adjacent to the weld layer is less than 5%; it is best that there is no mesh warping at the start and end of the fillet weld Curved elements and triangular mesh elements, the edges of the weld ...

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 frame complex work condition multi-axial fatigue calculation method including welding simulation. The method includes welding and structural unit grouping, finite element welding simulation, complex work condition defining, multi-axial building and multi-axial fatigue calculation. The complex work condition defining includes defining the magnitude, directions and loading positions of fatigue load and optional one of fatigue circulation work conditions comprising tilting moment fatigue, S-shaped turning fatigue, continuous brake fatigue, torsional fatigue and multi-freedom-degree fatigue. Multi-axial building includes building at least two fatigue life axes according to the defined fatigue load and the fatigue circulation work condition. Multi-axial fatigue calculation includes using fatigue life calculation software to build calculation channels corresponding to the fatigue axes in number so as to perform multi-channel multi-axial fatigue life calculation according to the defined complex work condition and the built fatigue life axes. The frame complex work condition multi-axial fatigue calculation method has the advantages that accurate fatigue life calculation is achieved, repeated research and development can be avoided, and energy saving and social progress are benefited.

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 Applications(China)
IPC IPC(8): G06F19/00
Inventor 苏锦涛
Owner CHINA AUTOMOTIVE ENG RES INST
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