A Novel Nondestructive, Noncontacting Method of Measuring the Depth of Thin Slits and Cracks in Metals

Hruby, R. J.; Feinstein, L.G.

doi:10.1063/1.1684617

Cited by 30 publications

(16 citation statements)

References 2 publications

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“…However, they are generally inaccurate if the cracks are very thin and have large depth-to-width aspect ratio. (28) Ihe depth of very thin surface cracks can be measured by microwave. Microwave power in higher order modes is generated in a circular waveguide and directed against a sanple surface which lies within the Tresnel zone of the coupling aperture.…”

Section: Microwave Meihodmentioning

confidence: 99%

Nondestructive Detection of Structural Damage Uniquely Associated with Fatigue

Moore¹,

Tsang²,

Thompson³

et al. 1974

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NOTICE When Government Hrawings, specifications, or other data are used for any purpose other than in connection with a definitely related Government procurement operation, the United States Government thereby incurs no responsibility nor any obliga'.ion whatsoever; and the fact that the Government may have fomulated, furnished, or in any way supplied the said drawings, specifications, or other data, is not to be regarded by implication or otherwise as in any manner licensing the holder or any other person or corporation, or conveying any rights or permission to manufacture, use, or sell any patented invention that may in any way be related thereto. Thi. technical report has been reviewed and is approved for publication

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Section: Microwave Meihodmentioning

confidence: 99%

Nondestructive Detection of Structural Damage Uniquely Associated with Fatigue

Moore¹,

Tsang²,

Thompson³

et al. 1974

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“…Therefore, research in developing new and emerging technologies for hairline surface crack detection is an ongoing process. Consequently, there have been several researchers who have attempted using microwaves for surface crack detection in metals, achieving modest success [2][3][4]. None of their attempts have dealt with detecting cracks filled with dielectric fillers and covered with dielectric coatings (e.g.…”

Section: Introductionmentioning

confidence: 99%

Microwave Measurement-Parameter Optimization for Detection of Surface Breaking Hairline Cracks in Metals

Zoughi

Ganchev

Huber

1998

Nondestructive Testing and Evaluation

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Fatigue and stress induced hairline surface crack detection in metals is an important practical issue. A newly developed microwave inspection approach, using an open-ended rectangular waveguide, has proved to be an effective tool for detecting such cracks. This novel microwave approach overcomes some of the limitations associated with the standard detection methods for surface crack detection. In addition, this approach is applicable to exposed and filled cracks (with a dielectric such as dirt, rust, etc.), and cracks under dielectric coatings such as paint and composite dielectric laminates. This paper briefly presents the basic foundation of this surface crack detection methodology. More importantly, this paper focuses on the ways by which measurement parameters may be optimized for increased crack detection sensitivity. Theoretical as well as experimental results are provided.

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“…Until 1992, microwave NDE techniques had been proposed for detecting surface cracks in metals but with limited success. [2][3][4][5] Since 1992, near-field microwave crack detection approaches and techniques that use open-ended rectangular waveguide probes have been developed. [6][7][8][9][10][11][12][13][14][15][16][17][18] The investigation and applications of these techniques for detecting and evaluating fatigue surface cracks have shown several advantageous features, such as:…”

mentioning

confidence: 99%

Microwave and millimetre wave sensors for crack detection

Zoughi

Kharkovsky

2008

Fatigue Fract Eng Mat Struct

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A B S T R A C T Non-destructive detection and evaluation of stress-induced fatigue cracks in metals is an important practical issue in several critical environments including surface transportation (steel bridges, railroad tracks, railroad car wheels, etc.), aerospace transportation (aircraft fuselage, landing gears, etc.) and power plants (steam generator tubings, etc.). Although there are several standard non-destructive evaluation techniques, near-field microwave and millimetre wave techniques have shown tremendous potential for significantly adding to the available non-destructive 'toolbox' for this purpose. This paper serves as a review of recent advances made in this area and the capabilities of these techniques for detecting cracks and evaluating their various dimensional properties including determining a crack tip location accurately. These techniques include using open-ended rectangular probes (in two distinct modes) and open-ended coaxial probes. a = broad dimension of the open-ended rectangular waveguide aperture b = narrow dimension of the open-ended rectangular waveguide aperture D = crack depth dc = direct current DM = dominant mode GHz = gigahertz h = distance between the crack and the coaxial centre HOM = higher order mode k = ratio of the distance between the probe and the waveguide wall and narrow dimension (height) of the open-ended rectangular waveguide aperture l = distance between a detector and a waveguide aperture NDE = non-destructive evaluation TE = transverse electrical TEM = transverse electric and magnetic TM = transverse magnetic 2D = two dimensional r i = radius of an internal conductor of a coaxial probe r o = radius of an external conductor of a coaxial probe W = crack width T = the distance between the probe and the waveguide wall δ = location of the crack within waveguide aperture I N T R O D U C T I O N Metal fatigue or failure usually begins from the surface. Aircraft fuselage, nuclear power plant steam generator tubings and steel bridges are examples of environments in which this type of metal failure occurs. Hence, fatigue and Correspondence: R. Zoughi.stress crack detection on metallic structures is of utmost importance to the on-line and in-service inspections of critical metallic components. Currently, there are several prominent non-destructive evaluation (NDE) techniques for detecting surface cracks in metals. Acoustic emission testing, dye penetrant testing, eddy current testing, ultrasonic testing, radiographic testing and magnetic particle testing are examples of the techniques. 1 However, each

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A Novel Nondestructive, Noncontacting Method of Measuring the Depth of Thin Slits and Cracks in Metals

Cited by 30 publications

References 2 publications

Nondestructive Detection of Structural Damage Uniquely Associated with Fatigue

Nondestructive Detection of Structural Damage Uniquely Associated with Fatigue

Microwave Measurement-Parameter Optimization for Detection of Surface Breaking Hairline Cracks in Metals

Microwave and millimetre wave sensors for crack detection

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