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Method for manufacturing surface crack sample for nondestructive testing sensitivity test

A production method and non-destructive testing technology, applied in the preparation of test samples, etc., can solve the problems that the production process is difficult to control, the shape cannot truly represent natural defects, etc., and achieve the effect of easy control of the production process, simple production method, and small size

Active Publication Date: 2010-05-19
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a method for making surface crack samples for non-destructive testing sensitivity tests that overcomes the shortcomings that the size and shape of defects cannot truly represent natural defects or the production process is not easy to control in the traditional method of making defect samples.

Method used

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  • Method for manufacturing surface crack sample for nondestructive testing sensitivity test
  • Method for manufacturing surface crack sample for nondestructive testing sensitivity test
  • Method for manufacturing surface crack sample for nondestructive testing sensitivity test

Examples

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Effect test

Embodiment 1

[0030] To determine the circumferential magnetization specification for magnetic particle testing for a certain steel grade, the goal is to detect fatigue cracks with a depth of 0.1 mm on the steel surface.

[0031] Circumferential magnetization detection test is carried out on this steel to determine its circumferential magnetization specification. Circumferential magnetization inspection test requires that the sample has surface crack defects perpendicular to its circumferential direction.

[0032] Select a square metal plate with the same material as the steel, 100mm in length and width, and 20mm in thickness, and machine a sharp notch on the center of one side of the metal plate. The opening depth of the sharp notch is 40mm, and the minimum opening width is 0.12mm, leaving an area of ​​100mm×60mm on the metal plate below the notch.

[0033] A load is applied to both sides of the notch on the axial loading fatigue testing machine, so that the root of the notch appears to crack th...

Embodiment 2

[0040] Through experiments, determine the minimum crack depth size that can be detected for a certain steel type in the magnetic particle detection of longitudinal magnetization.

[0041] Carry out longitudinal magnetization detection test. The longitudinal magnetization test requires that the sample has surface crack defects perpendicular to its length.

[0042] Select a square metal plate with the same material as the steel, 70mm in length and width, and 15mm in thickness, and machine a sharp notch on the center of one side of the metal plate. The opening depth of the sharp notch is 50mm, the minimum opening width is 0.12mm, and an area of ​​70mm×20mm is reserved on the metal plate below the notch.

[0043] A load is applied to both sides of the notch on the axial loading fatigue testing machine, so that the root of the notch appears to crack through the thickness of the entire metal plate, and a fatigue crack with a depth of about 3mm is prefabricated. Determine the position of ...

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Abstract

The invention belongs to nondestructive testing technology, and relates to a method for manufacturing a surface crack sample for a nondestructive testing sensitivity test. The method adopts a fatigue loading mode to manufacture a crack defect, and the operation is simple; the manufactured fatigue crack defect has small dimensions and belongs to typical crack defect. Therefore, the manufactured fatigue crack defect has excellent representativeness for natural crack defects. The method can successfully acquire crack samples with dimensions of natural cracks; and dimensions and shapes of the samples and directions and positions of the crack defects can meet most test requirements. The manufacturing process is easily controlled, which is particularly applicable to adjustment and experimental verification for circumferential magnetization detection sensitivity in magnetic particle testing, and the method can be applied to testing research of detecting sensitivity of the surface cracks in three nondestructive testing specialities, namely ultrasound, vortex and penetration.

Description

Technical field [0001] The invention belongs to non-destructive testing technology, and relates to a method for making surface crack samples for non-destructive testing sensitivity tests. Background technique [0002] Non-destructive testing, as an effective means of detecting defects in workpieces, has an important position in modern industry due to its non-destructive, convenient and fast characteristics. In the process of non-destructive testing, whether the detection sensitivity is appropriate or not is one of the keys to defect detection. When determining the detection sensitivity parameters, it is usually difficult to ensure the reliability of the results using theoretical methods, and it is generally necessary to use defective samples for detection tests to further adjust and verify the sensitivity parameters. The ideal defect sample should be a sample with natural defects of critical size. However, the formation of natural defects has greater chance. Obtaining such sampl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/28G01N1/32
Inventor 王东升任学冬王树志史亦韦
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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