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Constant-load stress corrosion testing device of small test sample and testing method thereof

A stress corrosion and testing device technology, applied in measuring devices, using stable tension/pressure to test material strength, weather resistance/light resistance/corrosion resistance, etc. Experiments, the reliability of experimental results and the reduction of on-site reference value, etc., to achieve the effect of ensuring accuracy

Inactive Publication Date: 2014-07-16
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (B) Forced processing of small-sized parts into standard samples causes damage to mechanical properties, reducing the reliability of experimental results and the value of on-site reference;
[0007] (C) The detection device is not suitable for the test of small-sized samples, and the load range is too large to cause inaccurate loads, and it is impossible to monitor the sample load in real time during the experiment
[0008] In order to solve the problem that the conventional constant load stress corrosion test cannot carry out the small size sample stress corrosion test, the present invention proposes a small sample constant load stress corrosion evaluation method with the help of the stress ring, and designs the sample clamping, The loading device forms a new experimental method suitable for constant load stress corrosion of small-sized samples, which can solve the above problems well

Method used

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  • Constant-load stress corrosion testing device of small test sample and testing method thereof
  • Constant-load stress corrosion testing device of small test sample and testing method thereof
  • Constant-load stress corrosion testing device of small test sample and testing method thereof

Examples

Experimental program
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Effect test

example 1

[0050] Example 1 uses a small sample for conventional stress corrosion testing

[0051] To test the stress corrosion resistance performance of a metal composite pipe, firstly according to image 3 There are 6 samples processed in size. The thickness of the samples can be adjusted according to the wall thickness of the composite pipe. They are installed in the stress corrosion test device. The specific loading data are shown in Table 1.

[0052] After 720 hours of the experiment, the samples were cleaned for morphology observation and microscopic analysis. It was found that none of the six samples were broken, but a certain degree of damage occurred in different parts. Among them, there was no damage on the macroscopic surface of specimen 1 and specimen 2. 4 has obvious cracking macroscopic cracks, fish scale damage appears on the surface of specimen 6, irregular macroscopic damage occurs on the surface of specimen 3 and specimen 5, and the stress corrosion resistance performan...

example 2

[0053] Example 2 The present invention carries out small sample stress corrosion test

[0054] 6 samples are processed equally, and the sample is assembled on the stress corrosion sample device according to the present invention, and the corrosion experiment cavity (12) is not installed temporarily when the load is tested, and the strain gauge (10) is attached to the stress measurement sample ( 9) In the parallel section, according to the principle of force interaction, the tensile stress of the sample (16) can be accurately measured only by performing a stress-strain test on the stress measurement sample (9), thereby further verifying the stability of the stress ring loading load. accuracy.

[0055] In order to verify the accuracy and reliability of the loading of the device, the strain gauges (10) were respectively attached to the parallel sections of the stress measurement sample (9) and the sample (16), which were respectively marked as A1 and A3, and then the samples were...

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Abstract

The invention relates to a constant-load stress corrosion evaluation method and a constant-load stress corrosion evaluation device of a small test sample. The essentials are as follows: the constant-load stress corrosion testing method and device can be used for testing an anti-stress corrosion cracking property of a thin-wall pipe and a small-size member; the small-size test sample is designed and processed and the level of the loaded stretching stress is accurately controlled; a stress corrosion experiment is carried out in an acidic environment; an anti-sulfide stress corrosion performance and an acting mechanism of the thin-wall pipe and the small-size member in the acidic corrosion environment are evaluated and researched according to an experiment result. With the adoption of the evaluation method and device, the anti-stress corrosion cracking property of the thin-wall pipe and the small-size member, which can not be used for processing a standard test sample, can be determined; the applicability of the material of the member can be obtained according to a testing result, so that the material selection and the applicability evaluation of the thin-wall pipe and the small-size member are carried out.

Description

technical field [0001] The present invention relates to an experimental method for constant load stress corrosion evaluation of components such as thin-walled pipes and small-sized components in oil and gas fields that cannot be processed by standard samples. The present invention also relates to using the method to test stress corrosion of thin-walled pipes and small-sized components. characteristic experimental setup. Background technique [0002] In the chemical experiment of metal materials, it is necessary to conduct constant load stress corrosion experiments on components that cannot be processed with standard samples such as thin-walled pipes and small-sized components in the petroleum industry and chemical industry, so as to test the components in the stress state and corrosion environment. Material selection and applicability evaluation. At present, the general method of constant load stress corrosion test at home and abroad is to use the stress ring to carry out t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N3/08G01N17/00
Inventor 曾德智侯铎张智施太和黄黎明谷坛扈俊颖邓文良
Owner SOUTHWEST PETROLEUM UNIV
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