Defect evaluation by ultrasonics

Mundry, Eberhard

doi:10.1016/0029-1021(72)90144-2

Cited by 4 publications

(3 citation statements)

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“…Key features of his original construction of DGS diagrams are still retained in the current DGS diagrams [ 1 , 3 , 5 ]. Many subsequent studies have refined DGS diagrams [ 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 ], and an ISO standard was issued in 2012 [ 49 ]. Unfortunately, the scientific foundation of the published DGS diagrams has remained obscure due to non-disclosure of their construction methods.…”

Section: Introductionmentioning

confidence: 99%

“…Unfortunately, the scientific foundation of the published DGS diagrams has remained obscure due to non-disclosure of their construction methods. In a conference publication, Mundry [ 38 , 39 ] reported on sound field calculations, but only an equation containing four integrals was presented. He stated that the integrals were solved using Simpson’s method, giving some echo amplitude distribution curves.…”

Section: Introductionmentioning

confidence: 99%

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Critical Examination of Distance-Gain-Size (DGS) Diagrams of Ultrasonic NDE with Sound Field Calculations

Ono,

2023

Sensors

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Ultrasonic non-destructive evaluation, which has been used widely, can detect and size critical flaws in structures. Advances in sound field calculations can further improve its effectiveness. Two calculation methods were used to characterize the relevant sound fields of an ultrasonic transducer and the results were applied to construct and evaluate Distance-Gain-Size (DGS) diagrams, which are useful in flaw sizing. Two published DGS diagrams were found to be deficient because the backward diffraction path was overly simplified and the third one included an arbitrary procedure. Newly constructed DGS diagrams exhibited transducer size dependence, revealing another deficiency in the existing DGS diagrams. However, the extent of the present calculations must be expanded to provide a catalog of DGS diagrams to cover a wide range of practical needs. Details of the new construction method are presented, incorporating two-way diffraction procedures.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Critical Examination of Distance-Gain-Size (DGS) Diagrams of Ultrasonic NDE with Sound Field Calculations

Ono,

2023

Sensors

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“…1] illustrates how defect detectability varies with distance into the test piece for given equipment and artificial disc reflectors oriented perpendicular to the ultrasonic beam.…”

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confidence: 99%

Detection, Sizing and Monitoring of Defects by Nondestructive Evaluation: An Overview

Kupcis¹

1980

Canadian Metallurgical Quarterly

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The increasing application of fracture mechanics analysis to defects uncovered by nondestructive examination of components and structures has placed new and difficult demands on nondestructive testing techniq ues.Any analysis of the significance of defects on the contin ued structural integrity of components will at least req uire an estimate of the defect size. If such defects are assessed as not being "critical", then an ability to periodically monitor defect growth during service becomes important. Thus, a nondestructive inspection technique must be judged as to its sensitivity in detecting significant defects, its accuracy in measuring defect size and position, and its ability to monitor defect growth. All inspection techniques have limitations in these areas, which must be accounted for in critical applications. This paper will discuss and illustrate the factors affecting defect size estimation and crack growth monitoring with particular reference to the ultrasonic inspection technique, since it comes closest in best fulfilling the three criteria for the volumetric inspection of most structures Resume-L'application croissante de l'analyse par la mecanique de la rupture de derauts mis a jour par l'examen non destructif des composants et des structures a induit des exigcnccs nouvelles et difficiles pour les methodes de contr6le non destructives. N'importe quelle analyse de l'influence d'un deraut sur l'integrite structurale d'un composant requiert au moins une estimation de la taille du deraut. Si de tels derauts ne sont pas estimes comme critique, alors un contr6le periodique de la croissance possible de ces derauts devient primordial. Des lors, une technique de contr6le non destructive doit etre appreciee selon sa sensibilite a reveler un deraut significatif, sa precision sur la mesure de la taille et la position de ce deraut et sa capacite a suivre l'evolution de ce deraut.Toutes les methodes de contr6le sont limitees dans ces differents domaines qui peuvent etre consideres comme critiques. Cet article discutera et illustrera les facteurs qui affectent l'estimation de la taille du deraut ainsi que Ie contr6le de son evolution avec un regard particulier vers les methodes de contr6le par ultra-sons elant donne que celle-ci semble etre la meilleure en ce qui concerne les 3 criteres d'inspection volumique de la plupart des structures.

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Ultrasonics in nondestructive evaluation

Thompson

1985

Proc. IEEE

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Defect evaluation by ultrasonics

Cited by 4 publications

References 4 publications

Critical Examination of Distance-Gain-Size (DGS) Diagrams of Ultrasonic NDE with Sound Field Calculations

Critical Examination of Distance-Gain-Size (DGS) Diagrams of Ultrasonic NDE with Sound Field Calculations

Detection, Sizing and Monitoring of Defects by Nondestructive Evaluation: An Overview

Ultrasonics in nondestructive evaluation

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