Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Resonance eddy detection method for surface crack

A detection method and technology for surface cracks, applied in the direction of material magnetic variables, etc., can solve problems such as difficult surface crack detection, and achieve the effect of simple processing and easy design of portable detection instruments.

Inactive Publication Date: 2009-03-18
TSINGHUA UNIV
View PDF7 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the electromagnetic eddy current detection method, the conventional eddy current method, pulsed eddy current method, near-field eddy current, far-field eddy current, multi-frequency eddy current and other methods have also been developed. At present, it is difficult to use the general electromagnetic eddy current method to detect surface cracks. Other methods require the workpiece to be disassembled, thoroughly cleaned, and then inspected

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Resonance eddy detection method for surface crack
  • Resonance eddy detection method for surface crack
  • Resonance eddy detection method for surface crack

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Detect crack width of 0.3mm, depth of 2mm, 1mm, 0.5mm standard eddy current testing crack samples

[0044] (2) The sensor probe sweeps across the crack at a speed of 0.5m / s, and the lift-off height is 2.5mm

[0045] (3) Obtain the detection data as shown in the table:

[0046]

Embodiment 2

[0048] (1) The detection crack width is 0.9mm-1.5mm continuous change, and the length is 150mm. The crack in the groove of the wheel hub is 2-3mm putty and anti-rust paint attached to the surface of the hub groove, and the surface is rough.

[0049] (2) The sensor probe sweeps across the crack at a speed of 2.5m / s, and the lift-off height is 4.5mm

[0050] (3) Obtain the detection data as shown in the table:

[0051]

Embodiment 3

[0053] (1) The detection crack width is 0.9mm-1.5mm continuous change, and the length is 150mm. The crack in the groove of the wheel hub is 2-3mm putty and anti-rust paint attached to the surface of the hub groove, and the surface is rough.

[0054] (2) The sensor probe sweeps across the crack at a speed of 1.5m / s, and the lift-off height is 6.5mm

[0055] (3) Obtain the detection data as shown in the table:

[0056]

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

This invention relates to crack resonance whorl testing method, which belongs to iron magnetic material lossless electro-magnetic testing field. This invention uses resonance circuit to generate pulse resonance signals to excite sensor ring to get whorl field to judge the crack existence through test ring. The advantage lies in improving extracting highness and overcomes the rough surface impact to realize spot test to fulfill traditional testing rough crack.

Description

technical field [0001] The invention relates to a non-destructive detection method for surface cracks, belonging to the technical field of non-destructive electromagnetic detection of ferromagnetic materials. Background technique [0002] Surface cracks have brought huge economic losses to modern industry, and accurate on-line detection has become a continuous industrial requirement. The existing surface crack detection technologies mainly include ultrasonic, magnetic powder, infiltration and electromagnetic methods; for the detection of surface cracks, ultrasonic testing has a wide range of objects, and various new materials such as composite materials, ceramic materials, etc., defect location is relatively accurate, but for The surface condition of the material to be tested has high requirements, and at the same time, a coupling agent is required between the measured object and the coupling state will greatly affect the results of ultrasonic testing; the coverage of the ul...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G01N27/90
Inventor 李路明黄刚郝红伟
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com