A Method for Determining the Anisotropy Coefficient of Circumferential Thickness of Anisotropic Pipe
A technology of thickness anisotropy and determination method, applied in the direction of applying stable tension/pressure to test material strength, etc., can solve the problem of inability to comprehensively and accurately describe the deformation properties of anisotropic pipes, and the inability to accurately determine the circumferential thickness anisotropy coefficient of pipes and other problems, to achieve the effect of accurate and reliable circumferential thickness anisotropy coefficient, wide application range, and easy promotion and application
Active Publication Date: 2021-05-11
DALIAN UNIV OF TECH
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Problems solved by technology
[0006] The present invention aims to solve the problem that the existing methods cannot accurately determine the anisotropy coefficient in the circumferential direction of the pipe material, and thus cannot comprehensively and accurately describe the deformation performance of the anisotropic pipe material, and proposes an anisotropy coefficient in the circumferential direction of the anisotropic pipe material method of determination
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[0062] The technical solutions of the present invention will be further described below in conjunction with specific embodiments.
[0063] Take the IF cold-rolled coil welded steel pipe with an outer diameter of 46mm and a wall thickness of 0.7mm as an example, combined with Figure 1 ~ Figure 3 and Figure 7 The implementation process of the present invention is described:
[0064] Step 1. Cut the pipe to be tested into a length of 200 mm, and conduct two sets of controllable bidirectional loading experiments on the pipe under different stress ratios, as shown in image 3 As shown, the stress and strain experimental data under the two-way stress state of the pipe are obtained;
[0065] The pipe bidirectional loading experiment is carried out on a special pipe bidirectional loading experiment test device (refer to patent CN105300802B), applying a tensile or compressive load to the end of the pipe, and applying a pressure medium inside the pipe to make the pipe in the set str...
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Abstract
The invention discloses a method for determining the circumferential thickness anisotropy coefficient of an anisotropic pipe, which belongs to the field of pipe performance testing. The steps of the method: one, obtain the stress and strain experimental data of the bidirectional stress state of the pipe sample under different loading paths through experiments; two, return the discrete stress-strain experimental data under each loading path, and combine the two The flow stress-strain curves in the direction are expressed as continuous functions; 3. Select the equivalent strengthening state parameters, and choose the flow stress in the axial uniaxial stress state as the equivalent stress; 4. Use the regression curve to calculate the same equivalent strengthening Stress and strain data corresponding to different stress paths under the state parameters; 5. Select the appropriate yield function f; 6. Determine the undetermined coefficient matrix of the yield function f; 7. Through the yield function f, use the plastic flow criterion to further calculate the pipe circumferential direction The thickness anisotropy coefficient of . The invention can accurately determine the circumferential thickness anisotropy coefficient of various anisotropic pipe materials.
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 anisotropy coefficient of anisotropic pipes in the circumferential direction. Background technique [0002] Internal high pressure forming of pipes is an advanced forming method for the production of hollow variable cross-section complex parts. Because the parts manufactured by it have excellent comprehensive mechanical properties such as high strength and large flexural modulus, it is widely used in automobiles, aviation, aerospace and sports cars. and other fields are increasingly widely used. However, the pipes used in internal high pressure forming are usually rolled and welded after extrusion or rolling, and have obvious anisotropy along the axial and circumferential directions of the pipes, and are prone to instability wrinkling or excessive local thinning in the process of plastic deformation. Defects such as large crack...
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IPC IPC(8): G01N3/08
CPCG01N3/08
Inventor 林艳丽何祝斌胡馨予朱海辉苑世剑
Owner DALIAN UNIV OF TECH