Quantitative Ultrasonic Nondestructive Evaluation Methods

Thompson, R. B.

doi:10.1115/1.3167201

Cited by 49 publications

(16 citation statements)

References 92 publications

(103 reference statements)

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“…In the field of engineering, it is a crucial problem to preclude the catastrophic fracture of structural materials which is controlled by the behavior of preexisting flaws-such as microcracks, open as well as shear, induced by metal fatigue. The nondestructive testing for detecting such flaws is highly important; one of the most effective ways is to make use of the scattered waves due to the flaws (Thompson, 1983). In this paper, we theoretically study the scattering of P, SV waves by random distribution of aligned open cracks.…”

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confidence: 99%

Scattering of P, SV Waves by Random Distribution of Aligned Open Cracks.

Kawahara

1992

J,Phys,Earth

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Scattering of P, SV Waves by Random Distribution of Aligned Open Cracks.

Kawahara

1992

J,Phys,Earth

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“…The use of ultrasonic pulse-echo techniques to find flaws or cracks in pipes has become widespread in pipe manufacturers [5]. The automation of this process has facilitated collection of large quantities of data [6].…”

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Automatic Ultrasonic Testing System Designed For Small-Diameter Steel Pipes With Thick Wall

Zhang¹,

Hou²,

Tang³

2017

IJCA

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“…Thompson 1983, Bracewell 1965. That is, at wave lengths corresponding to some frequencies, the spacing between the two delta function is such that their components at those frequencies constructively interfere;…”

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“…(2.7) and were then normalized to 1.0 since only the shape of the curves is important here. The host material was taken to be stainless steel (pigg=7.9g/cc, c^^=0.58cm/Ms, and T T Css"0.31cm/Ms, where c^^ is the shear wave speed in stainless steel) and the flaw was assumed to have a smaller acoustic impedance than that of the "-t surface delta function reflections in the impulse response function (Thompson 1983, Bracewell 1965. That is, at wave lengths corresponding to some frequencies, the spacing between the two delta function is such that their components at those frequencies constructively interfere;…”

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A prior knowledge based optimal Wiener filtering approach to ultrasonic scattering amplitude estimation

Neal

Thompson

1989

The Journal of the Acoustical Society of America

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, "A prior knowledge based optimal Wiener filtering approach to ultrasonic scattering amplitude estimation " (1988). Retrospective Theses and Dissertations. 8877. http://lib.dr.iastate.edu/rtd/8877 INFORMATION TO USERSThe most advanced technology has been used to photo graph and reproduce this manuscript from the microfilm master. UMI films the text directly from the original or copy submitted. Thus, some thesis and dissertation copies are in typewriter face, while others may be from any type of computer printer.The quality of this reproduction is dependent upon the quality of the copy submitted. Broken or indistinct print, colored or poor quality illustrations and photographs, print bleedthrough, substandard margins, and improper alignment can adversely affect reproduction.In the unlikely event that the author did not send UMI a complete manuscript and there are missing pages, these will be noted. Also, if unauthorized copyright material had to be removed, a note will indicate the deletion.Oversize materials (e.g., maps, drawings, charts) are re produced by sectioning the original, beginning at the upper left-hand corner and continuing from left to right in equal sections with small overlaps. Each original is also photographed in one exposure and is included in reduced form at the back of the book. These are also available as one exposure on a standard 35mm slide or as a 17" x 23" black and white photographic print for an additional charge.Photographs included in the original manuscript have been reproduced xerographically in this copy. Higher quality 6" x 9" black and white photographic prints are available for any photographs or illustrations appearing in this copy for an additional charge. Contact UMI directly to order. Signature was redacted for privacy.Signature was redacted for privacy.Signature was redacted for privacy. The work reported here is associated with flaw characterization.This work is motivated from an engineering perspective by considering two fundamentally different approaches to life prediction that can be found in fatigue of materials and structures. In a simplistic sense, a "safe life"or "zero defects" fatigue life prediction approach (Coffin and Tiffany 1976) assumes that once a flaw is macroscopic, i.e., once a flaw has grown to a size which can be detected by NDE techniques, failure is imminent and the component must be taken out of service. With this approach, qualitative NDE indicating the presence or absence of a flaw provides sufficient information to determine if a component should be retired. An alternative approach, which is sometimes referred to as a "damage tolerance" approach, is based on a fracture mechanics methodology (Coffin and Tiffany 1976, Rolfe and Barsom 1977). With this approach, instead of assuming that all flawed components must be taken out of service, the 2 severity of the flaw is assessed and a more rational determination of the remaining life of the component is made. To implement this approach, quantitative flaw characterization is required. As a minimum...

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Quantitative Ultrasonic Nondestructive Evaluation Methods

Cited by 49 publications

References 92 publications

Scattering of P, SV Waves by Random Distribution of Aligned Open Cracks.

Scattering of P, SV Waves by Random Distribution of Aligned Open Cracks.

Automatic Ultrasonic Testing System Designed For Small-Diameter Steel Pipes With Thick Wall

A prior knowledge based optimal Wiener filtering approach to ultrasonic scattering amplitude estimation

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