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A Method for Determining Thickness Anisotropy Coefficient of Pipe in Any Direction

A technology of thickness anisotropy and arbitrary direction, applied in the field of determination of thickness anisotropy coefficient in any direction, can solve the problem that the thickness anisotropy coefficient of extruded pipe cannot be obtained, and achieve the effect of wide application range and accurate and reliable coefficient

Active Publication Date: 2021-05-07
DALIAN UNIV OF TECH
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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing test methods cannot obtain the thickness anisotropy coefficient of extruded pipes in any direction, and proposes a method for determining the thickness anisotropy coefficient of pipes in any direction

Method used

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  • A Method for Determining Thickness Anisotropy Coefficient of Pipe in Any Direction
  • A Method for Determining Thickness Anisotropy Coefficient of Pipe in Any Direction
  • A Method for Determining Thickness Anisotropy Coefficient of Pipe in Any Direction

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Embodiment Construction

[0061] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.

[0062] Take the 6061O tempered aluminum alloy extruded pipe with an outer diameter of 60mm and a wall thickness of 1.8mm as an example. Figure 1 to Figure 13 The implementation process of the present invention is described:

[0063] Step 1. Cut the tube billet to be tested into a sample with a length of 390 mm, and conduct two sets of tube bidirectional controllable loading bulging experiments, such as Figure 9 In order to obtain the stress and strain experimental data of the bidirectional stress state of the pipe under the two fixed collar stress ratio loading paths.

[0064] The pipe bidirectional loading experiment is carried out on a special pipe bidirectional loading experimental test device (refer to patent CN105300802B), applying a tensile load to the end of the pipe, and applying a pressure medium inside the pipe to deform the pipe unde...

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Abstract

The invention relates to a method for determining the thickness anisotropy coefficient in any direction of a pipe, which belongs to the field of pipe performance testing. The present invention first establishes a relational expression between the thickness anisotropy in any direction and the yield function, determines the undetermined coefficient of the yield function through the bidirectional loading experiment method of the pipe, and then substitutes the established relational expression to determine the thickness anisotropy coefficient in any direction of the pipe. This method ensures that the coefficient of thickness anisotropy is accurate and reliable from three aspects: 1) The blanks involved in the experiment are all original tube blanks, and there is no need to destroy the shape of the tube, nor introduce pre-deformation, and the obtained experimental results can accurately reflect the shape of the tube. Plastic properties; 2) Advanced yield functions can be selected, and experimental data under different loading paths can be introduced at the same time, so as to more comprehensively reflect the plastic flow characteristics of pipes; 3) Design characteristic experiments to obtain the same deformation in different directions, through finite element analysis Iterate repeatedly with the characteristic experiment to ensure that the coefficient of the shear component is accurate and reliable, so as to establish an accurate and reliable yield function.

Description

technical field [0001] The invention belongs to the field of performance testing of pipes, and in particular relates to a method for determining the thickness anisotropy coefficient of pipes in any direction. Background technique [0002] Hollow integral components made of metal tubes are widely used in aerospace and automotive fields due to their structural weight reduction and excellent mechanical properties. This type of component is generally manufactured by internal high pressure forming technology. During internal high pressure forming, the pipe is deformed under the combined action of internal pressure and axial force, and the tube blank will experience a complex stress path from sealing, preforming to final forming. For complex components, it will even go through the process of loading-unloading-reloading. Once the loading path is unreasonable, defects such as wrinkles and cracks will appear. Therefore, it is very important to determine reasonable process parameters...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 林艳丽何祝斌朱海辉胡馨予苑世剑
Owner DALIAN UNIV OF TECH
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