Method for continuously measuring change of shrinkage strain ratio of titanium alloy pipe

A shrinkage strain, titanium alloy technology, applied in the direction of applying stable tension/pressure to test the strength of materials, etc., can solve problems such as error in analysis results

Active Publication Date: 2013-05-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a constant shrinkage-strain ratio is used to analyze the bending deformation of titanium alloy pipes, it will inevitably bring certain errors to the analysis results.

Method used

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  • Method for continuously measuring change of shrinkage strain ratio of titanium alloy pipe
  • Method for continuously measuring change of shrinkage strain ratio of titanium alloy pipe
  • Method for continuously measuring change of shrinkage strain ratio of titanium alloy pipe

Examples

Experimental program
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Effect test

Embodiment 1

[0041] This embodiment is a method for continuously measuring the shrinkage strain ratio of titanium alloy pipes, and the specific steps are as follows:

[0042] Step 1, making a tube sample. Sampling according to GB / T228-2002 tensile standard for pipes with stopper rods. 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. Tube samples such as figure 1 shown.

[0043] 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 reference, and take 25mm to both sides of the center as gauge point A and gauge point B respectively, and the gauge point A and gauge point B are marked with dashed lines. The gauge length between the gauge point A and the gauge point B is the gauge length of the pipe sample, and the length is L 0 . In this example, L 0 = 50mm.

[0044] A pipe plug made of 45# steel is in...

Embodiment 2

[0077] This embodiment is a method for continuously measuring the shrinkage strain ratio of titanium alloy pipes, and the specific steps are as follows:

[0078] Step 1, making a tube sample. Sampling according to GB / T228-2002 tensile standard for pipes with stopper rods. The length of the tube sample was 154 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.

[0079] 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 reference, and take 25mm to both sides of the center as gauge point A and gauge point B respectively, and the gauge point A and gauge point B are marked with dashed lines. The gauge length between the gauge point A and the gauge point B is the gauge length of the pipe sample, and the length is L 0 . In this example, L 0 = 50mm.

[0080] A pipe plug made of 45# steel...

Embodiment 3

[0093] This embodiment is a method for continuously measuring the shrinkage strain ratio of titanium alloy pipes, and the specific steps are as follows:

[0094] Step 1, making a tube sample. Sampling according to GB / T228-2002 tensile standard for pipes with stopper rods. The length of the tube sample was 180 mm, the wall thickness was 0.9 mm, the outer diameter was 12 mm, and the inner diameter was 10.2 mm. Tube samples such as figure 1 shown.

[0095] 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 reference, and take 25mm to both sides of the center as gauge point A and gauge point B respectively, and the gauge point A and gauge point B are marked with dashed lines. The gauge length between the gauge point A and the gauge point B is the gauge length of the pipe sample, and the length is L 0 . In this example, L 0= 50mm.

[0096] A pipe plug made of 45# stee...

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Abstract

The invention discloses a method for continuously measuring the change of shrinkage strain ratio of a titanium alloy pipe, which processes a pipe sample according to the size of a metal pipe sample in the national standard GB / T228-2002 and performs a stretching test at a set speed. In the stretching process, the changes of the outer diameter and axial scale distance of the pipe sample are accurately obtained through a transverse extensometer and a longitudinal extensometer respectively. The obtained outer diameter and axial scale distance of the pipe sample are corrected and substituted into a calculation formula of shrinkage strain ratio to obtain the changing shrinkage strain ratio. The method can effectively improve the accuracy of measuring the shrinkage strain ratio of a titanium alloy pipe. In the whole deformation process, the shrinkage strain ratio of the titanium alloy pipe is in a decreasing trend; at the initial stage of deformation of a pipe sample, the decreasing trend of the shrinkage strain ratio is obvious; the decreasing trend of the shrinkage strain ratio is gradually reduced in the following deformation; and the decreasing trend of the shrinkage strain ratio tends to be stable in subsequent deformation.

Description

technical field [0001] The invention belongs to the field of metal plastic forming processing, and is used for main performance detection during plastic forming processing of titanium alloy pipes, in particular to a method for measuring the shrinkage strain ratio change of titanium alloy pipes. Background technique [0002] In high-tech fields such as aviation, aerospace, energy, etc., titanium alloy elbow fittings are an indispensable and widely used type of component. The shrinkage strain ratio is one of the important indicators to measure the deformation performance of titanium alloy pipes. Its size is usually expressed by the ratio of the strain in the width direction and the strain in the thickness direction of the sample during uniaxial tension. The shrinkage strain ratio can be expressed as CSR. In the existing research, the shrinkage strain ratio of titanium alloy pipes is mainly obtained according to the aviation standard SAE AS4076. This method is to measure the a...

Claims

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Application Information

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