Event Title

Calculation of Wideband Ultrasonic Fields Radiated By Water- Coupled Transducers into Heterogeneous Media

Location

Snowbird, UT, USA

Start Date

1-1-1999 12:00 AM

Description

In nuclear power plants, many components to be tested by non destructive ultrasonic means can be heterogeneous. Welds, for instance, may be described as sets of disoriented anisotropic zones separated by non planar interfaces. Such materials have to be considered in the calculation of the field because they often lead to beam deviation and distortion effects. Needs for simulation of ultrasonic testing in such media are more and more expressed in order to demonstrate the performances of a given testing configuration or to help the design of new adapted ones. Here a 3D-model is presented which fulfills such industrial requirements, being able to deal with any arbitrarily shaped transducer, being numerically efficient so that intensive use is allowed (to assist the settings and interpretation of tests in power plants), and being transient so that wideband fields can be computed. This is an extension of the software Champ-Sons previously described a few years ago [1,2]. Here, a special interest is given to the effects of heterogeneity since the anisotropy has been treated last year [3]. The method used is a pencil method, related to the Geometrical Optics (GO) approximation. This method is presented in the first part of this paper. Different configurations are studied and then the general case is considered. The second part gives numerical examples of such calculations. Finally, a summary is given.

Book Title

Review of Progress in Quantitative Nondestructive Evaluation

Volume

18A

Chapter

Chapter 4: UT Transducers and Fields, Sensors

Section

UT Transducers Fields

Pages

1131-1138

DOI

10.1007/978-1-4615-4791-4_144

Language

en

File Format

application/pdf

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Jan 1st, 12:00 AM

Calculation of Wideband Ultrasonic Fields Radiated By Water- Coupled Transducers into Heterogeneous Media

Snowbird, UT, USA

In nuclear power plants, many components to be tested by non destructive ultrasonic means can be heterogeneous. Welds, for instance, may be described as sets of disoriented anisotropic zones separated by non planar interfaces. Such materials have to be considered in the calculation of the field because they often lead to beam deviation and distortion effects. Needs for simulation of ultrasonic testing in such media are more and more expressed in order to demonstrate the performances of a given testing configuration or to help the design of new adapted ones. Here a 3D-model is presented which fulfills such industrial requirements, being able to deal with any arbitrarily shaped transducer, being numerically efficient so that intensive use is allowed (to assist the settings and interpretation of tests in power plants), and being transient so that wideband fields can be computed. This is an extension of the software Champ-Sons previously described a few years ago [1,2]. Here, a special interest is given to the effects of heterogeneity since the anisotropy has been treated last year [3]. The method used is a pencil method, related to the Geometrical Optics (GO) approximation. This method is presented in the first part of this paper. Different configurations are studied and then the general case is considered. The second part gives numerical examples of such calculations. Finally, a summary is given.