Novel stress corrosion test specimen and experiment method

A technology of stress corrosion and test methods, which is applied in the preparation of test samples, weather resistance/light resistance/corrosion resistance, and the use of stable tension/pressure to test the strength of materials, etc. It can solve the problems that are not suitable for stress corrosion tests and WOL samples Complicated processing, high material consumption, etc., to achieve the effect of convenient hanging test

Inactive Publication Date: 2010-11-10
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

Some samples are simple but require expensive and complicated sample machines (such as slow tensile tests), and the final results are also qualitative
However, WOL samples that can be used for KISCC and da/dt quantitative tests are complicated to proce

Method used

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  • Novel stress corrosion test specimen and experiment method
  • Novel stress corrosion test specimen and experiment method
  • Novel stress corrosion test specimen and experiment method

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Embodiment Construction

[0034] The specific implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings and examples, but the protection scope of the present invention should not be limited thereby.

[0035] The invention proposes a new plate-type sample which is cut and shaped by a wire cutting method at one time, then preloaded on a tensile testing machine, and the prestrain value of the tested part is measured and controlled by a displacement sensor. This pre-strain variable can be pre-set according to the test requirements as needed. Then use a special pad that meets the precision requirements to pad it into a specific position. It can be preloaded with a little unloading and ready to use. Even if stress corrosion cracking occurs during use, the displacement at the preload position can always remain unchanged, so this kind of sample should belong to the constant strain stress corrosion test sample.

[0036] see Figure ...

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Abstract

The invention discloses a novel stress corrosion test specimen and an experiment method thereof. The test specimen is in a rectangular flat plate shape, and the plate-shaped test specimen is cut and formed in one step by a line cutting method. The method comprises the following steps: step 1. preparing the test specimen for getting ready to do the displacement deformation stretching stress corrosion experiment of the stress corrosion crack test; step 2. preparing 42 percent of MgCl2 solution and NaCl/NaOH mixed solution; step 3. building an experiment device, and placing the prepared test specimen into the experiment environment for carrying out stress corrosion experiment until the test specimen has corrosion cracks; and step 4. taking the test specimen for carrying out gold phase observation, finding the crack initialization position, and carrying out statistical analysis on the two-phase stainless steel stress corrosion mechanism. The processing of the test specimen of the invention is very convenient, and can be completed through one-step processing by line cutting in existence of plate-shaped test blocks.

Description

technical field [0001] The invention relates to a stress corrosion test technique, in particular to a test method and a sample for a stress corrosion cracking test. Background technique [0002] The existing test methods for stress corrosion cracking generally fall into the following categories: [0003] (1) Stress corrosion cracking test under constant load The tensile sample 2 is suspended on a tensile testing machine loaded with a weight 3 , and the tensile sample must be immersed in a sealed corrosive medium environment chamber 1 . Alternatively, a cantilever beam sample 6 is used, one end of which is horizontally clamped on the chuck of a fixed frame, the tested part of the sample is immersed in a sealed corrosive medium environment chamber 4, and a weight is hung on the other end of the cantilever 5 loading. Generally, there is a notch 7 in the center of the cantilever sample. The general method of the two sample machine tests is shown in Figure 1. [0004] Among t...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01N3/08G01N17/00
Inventor 杨景强孙玉芬关凯书王志文
Owner EAST CHINA UNIV OF SCI & TECH
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