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Method for measuring stress corrosion crack propagation rate by employing slow strain rate tensile

A technology of crack growth rate and slow strain rate, which is used in the application of stable tension/pressure to test the strength of materials and the preparation of samples for testing. Simple, distortion-reducing effects

Inactive Publication Date: 2014-04-02
XIAN UNIV OF SCI & TECH
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Problems solved by technology

However, since this method uses the small change in the potential around the crack to measure the crack growth, there are many influencing factors, and any interference may cause errors in the monitoring results;

Method used

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  • Method for measuring stress corrosion crack propagation rate by employing slow strain rate tensile
  • Method for measuring stress corrosion crack propagation rate by employing slow strain rate tensile
  • Method for measuring stress corrosion crack propagation rate by employing slow strain rate tensile

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Embodiment Construction

[0045] Such as figure 1 Shown, slow strain rate tensile stress corrosion crack growth rate measurement method of the present invention, comprises the following steps:

[0046] Step 1. Pretreatment of compact tensile specimens: Select a standard compact tensile specimen for slow strain rate tensile test according to ASME standards, and use wire cutting and prefabrication fatigue cracks on the standard compact tensile specimen A pre-crack crack used to initially guide crack propagation is set, and the length of the pre-crack crack is a;

[0047] In this embodiment, the value of a is 10mm.

[0048] Step 2. Use a slow tension testing machine to perform a slow strain rate tensile test, and draw a curve diagram of the experimental data relationship between the loading force P and the displacement ΔL of the loading point. The specific process is as follows:

[0049] Step 201, setting the test parameters of the slow strain rate tensile test on the slow tensile testing machine, inclu...

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Abstract

The invention discloses a method for measuring stress corrosion crack propagation rate by employing slow strain rate tensile. The method comprises the following steps: 1. preprocessing a compact tension specimen; 2. carrying out a slow strain rate tensile test by adopting a slow lifting testing machine, and drawing an experimental data relationship graph between loading force P and loading point displacement deltaL; 3. simulating the slow strain rate tensile test carried out in the step 2, and drawing a theoretical analysis data relation graph between the loading force P and the loading point displacement deltaL; 4. obtaining corresponding test time t0, t1, t2,..., tn when the crack propagation lengths are deltaa0, deltaa1, deltaa2,..., deltaan; 5. obtaining the crack propagation rate. By adopting the method, the change of the loading force P and loading point displacement deltaL caused by crack propagation can be separated out, and the change of the deltaai can be predicted in real time, so that the crack propagation rate is obtained. Thus, test data distortion caused by environmental influence can be effectively alleviated, and the data accuracy is improved.

Description

technical field [0001] The invention belongs to the technical field of fracture mechanics, in particular to a method for measuring the expansion rate of slow strain rate tensile stress corrosion cracks. Background technique [0002] Crack initiation, growth and fracture are one of the important factors affecting the service life and safe service of important mechanical structures, involving aviation, aerospace, transportation, chemical industry, machinery, materials, energy and other engineering fields. Experimental testing of the crack propagation characteristics of structural materials is one of the important means of this research; [0003] In order to improve the corrosion resistance of nuclear power equipment, austenitic stainless steel and nickel-based alloys are widely used as structural materials for light water nuclear reactors. Practice and research have shown that austenitic stainless steel and nickel-based alloy materials will produce environmental induced crack...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N3/08
Inventor 薛河杜云鹏龚晓燕
Owner XIAN UNIV OF SCI & TECH
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