Preparation method of simulation stress corrosion cracks for eddy current testing

Abstract

The invention provides a preparation method of simulation stress corrosion cracks for eddy current testing. The method comprises the following steps: processing a flat plate test piece and leading in fatigue cracks with same size to real stress corrosion cracks ; obtaining a fatigue crack flat plate test piece; utilizing a four-point bending on-line loading device to conduct bending loading on the fatigue crack flat plate test piece to enable the fatigue crack to close opening; conducting eddy current testing experiment at the same time; acquiring eddy current detection signals under different loading states, wherein the closed-opening fatigue cracks under the loading state anastomotic to the real stress corrosion crack eddy current testing signals are equivalent to real stress corrosion cracks in eddy current testing meaning, and can be taken as the simulation cracks of the stress corrosion cracks. The stimulation test piece prepared according to the method can effectively replace stress corrosion crack test pieces which are complex in actual shapes and difficult to prepare, has the advantages that the simulation test piece is simple to operate, easy to realize, low in cost, and known in size of cracks, and can be extensively applied to a testing capability certification system of the stress corrosion crack quantitative eddy current testing method.

Description

technical field [0001] The invention relates to the field of preparation of a stress corrosion crack simulation test piece, in particular to a preparation method of a simulated stress corrosion crack for eddy current testing. Background technique [0002] Stainless steel materials sensitive to stress corrosion are widely used in nuclear power plants, and the existence of tensile stress and corrosive environment in nuclear power structures makes stress corrosion cracks widely exist in key parts of nuclear power plants, such as the heat exchange tube sheet expansion part of steam generators , Welding part of the main cooling tube platform, etc. The existence of stress corrosion cracks poses a huge threat to the safe operation of nuclear power structures, and considering economic benefits, it is necessary to evaluate the size of cracks, so the quantitative nondestructive testing of stress corrosion cracks is extremely important. At present, the testing ability certification sy...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the above-mentioned existing problems of difficult preparation of artificial stress corrosion crack test pieces and uncontrollable parameters of the prepared cracks, the purpose of the present invention is to provide a new method for simulating the preparation of stress corrosion cracks, which can be simulated and simulated in the sense of eddy current testing. Instead of stress corrosion crack test pieces, the proposed method has the advantages of simple operation, easy implementation, low cost, and known simulated crack size and depth, and can be widely used in the certification system of stress corrosion crack quantitative nondestructive testing capabilities

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