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Method for obtaining shrinkage strain ratio in continuous change of titanium alloy tube

A technology of shrinkage strain and titanium alloy tube, which is applied in the direction of applying stable tension/pressure to test the strength of materials, and can solve the problem of constant shrinkage strain ratio

Active Publication Date: 2015-07-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to overcome the deficiency in the prior art that the constant shrinkage strain ratio of the titanium alloy pipe can only be obtained under the condition of small plastic deformation, the present invention proposes a method for obtaining the continuously changing shrinkage strain ratio of the titanium alloy pipe

Method used

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  • Method for obtaining shrinkage strain ratio in continuous change of titanium alloy tube
  • Method for obtaining shrinkage strain ratio in continuous change of titanium alloy tube
  • Method for obtaining shrinkage strain ratio in continuous change of titanium alloy tube

Examples

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Embodiment 1

[0036] This embodiment is a method for obtaining a continuously changing shrinkage strain ratio of a titanium alloy tube, and the shrinkage strain ratio ranges from initial plastic deformation to 0.174 for plastic deformation.

[0037] The concrete steps of this embodiment are as follows:

[0038] Step 1, make a tube sample. Sampling in accordance with GB / T228-2002 tensile standard of pipe with stopper. The length of the tube sample is 130 mm, the wall thickness is 0.5 mm, the outer diameter is 6 mm, and the inner diameter is 5 mm. The tube sample is shown in Figure 1.

[0039] Two gauge points are determined on the tube sample. When determining the two gauge points, take the center of the length direction of the pipe sample as the benchmark, take 0.5mm on both sides of the center as the gauge point A and the gauge point B, respectively. Point A and gauge point B are marked with underlined lines. The gauge length of the tube sample is between the gauge length point A and ...

Embodiment 2

[0064] This embodiment is a method for obtaining a continuously changing shrinkage strain ratio of a titanium alloy tube, and the shrinkage strain ratio ranges from initial plastic deformation to plastic deformation of 0.175.

[0065] The concrete steps of this embodiment are as follows:

[0066] Step 1, make a tube sample. Sampling in accordance with GB / T228-2002 tensile standard of pipe with stopper. The length of the tube sample was 155 mm, the wall thickness was 0.6 mm, the outer diameter was 8 mm, and the inner diameter was 6.8 mm. Tube samples such as figure 1 shown.

[0067] Two gauge points are determined on the tube sample. When determining the two gauge points, take the center of the pipe sample length direction as the benchmark, take 0.5mm on both sides of the center, respectively, as the gauge point A and the gauge point B, and set the gauge length Point A and gauge point B are marked with underlined lines. The gauge length of the tube sample is between the ...

Embodiment 3

[0093] This embodiment is a method for obtaining a continuously changing shrinkage strain ratio of a titanium alloy tube, and the shrinkage strain ratio ranges from initial plastic deformation to 0.180 for plastic deformation.

[0094] The concrete steps of this embodiment are as follows:

[0095] Step 1, make a tube sample. Sampling in accordance with GB / T228-2002 tensile standard of pipe with stopper. The length of the tube sample is 180 mm, the wall thickness is 0.9 mm, the outer diameter is 12 mm, and the inner diameter is 10.2 mm. The tube sample is shown in Figure 1.

[0096] Two gauge points are determined on the tube sample. When determining the two gauge points, take the center of the pipe sample length direction as the benchmark, take 0.5mm on both sides of the center, respectively, as the gauge point A and the gauge point B, and set the gauge length Point A and gauge point B are marked with underlined lines. The gauge length of the tube sample is between the ga...

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Abstract

The invention discloses a method for obtaining a shrinkage strain ratio in continuous change of a titanium alloy tube. A tube test sample is machined according to the size of a metal tube test sample in GB / T228-2002. A tensile test is carried out on a tensile test machine in a set tensile speed. The changes of the circumferential strain and the axial strain of the tube test sample in the tensile process are both precisely obtained through a CCD (Charge Coupled Device) camera. The circumferential strain and axial strain values of the tube test sample are precisely measured by using the camera in the one-way tensile process, and are subjected to elastic corrosion so as to accurately obtain the shrinkage stain ratio of the titanium alloy tube under a large plasticity deformation condition in the tensile process through formulas; and moreover the shrinkage strain ratio of the titanium alloy tube is decreased, that is, in the primary deformation period of the tube test sample, the shrinkage stain ratio is decreased dramatically, however, in later deformation, the decrease tendency of the shrinkage stain ratio is gradually reduced, and the decrease tendency of the shrinkage stain ratio in later deformation is gradually stable.

Description

technical field [0001] The invention belongs to the field of metal plastic forming and processing, and is used for main performance detection of titanium alloy pipes during plastic forming processing, in particular to a method for continuously measuring the change of the shrinkage strain ratio of titanium alloy pipes under the condition of large plastic deformation. Background technique [0002] In high-tech fields such as aviation, aerospace, and energy, titanium alloy elbow fittings are an indispensable and widely used type of parts. The shrinkage strain ratio is one of the important indicators to measure the deformation performance of metal pipes. In the existing research, the shrinkage strain ratio of titanium alloy pipes is mainly obtained according to the aviation standard SAE AS4076. The method is to measure the axial gauge length and outer diameter of the specimen when the tensile deformation reaches the engineering strain level of 3.75% of the axial gauge length, t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/08
Inventor 詹梅皇涛谭金强杨合
Owner NORTHWESTERN POLYTECHNICAL UNIV
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