An Overview of Ultrasonic Beam Propagation and Flaw Scattering Models in the Civa Software

Mahaut, S.; Chatillon, Sylvain; Darmon, Michel; Leymarie, Nicolas; Raillon, R.; Calmon, Pierre

doi:10.1063/1.3362393

Cited by 14 publications

(9 citation statements)

References 5 publications

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“…The number of mesh points of the rough surface along the local axes x and y has then to be automatically fixed by the chosen mesh algorithm. The previously described Gaussian rough surface model is currently implemented for planar and cylindrical surfaces in 3D computations, and for their linear cross-sections in 2D, in the CIVA software [28] (platform for non-destructive evaluation simulation [29][30][31][32][33]). Examples of generated surfaces for small specimens with relatively high roughness are shown in Figure 1.…”

Section: Implementation Example For Generation Of An Individual Gaussian Rough Surfacementioning

confidence: 99%

Acoustic Scattering Models from Rough Surfaces: A Brief Review and Recent Advances

Darmon

Dorval

Baqué³

2020

Applied Sciences

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This paper proposes a brief review of acoustic wave scattering models from rough surfaces. This review is intended to provide an up-to-date survey of the analytical approximate or semi-analytical methods that are encountered in acoustic scattering from random rough surfaces. Thus, this review focuses only on the scattering of acoustic waves and does not deal with the transmission through a rough interface of waves within a solid material. The main used approximations are classified here into two types: the two historical approximations (Kirchhoff approximation and the perturbation theory) and some sound propagation models more suitable for grazing observation angles on rough surfaces, such as the small slope approximation, the integral equation method and the parabolic equation. The use of the existing approximations in the scientific literature and their validity are highlighted. Rough surfaces with Gaussian height distribution are usually considered in the models hypotheses. Rather few comparisons between models and measurements have been found in the literature. Some new criteria have been recently determined for the validity of the Kirchhoff approximation, which is one of the most used models, owing to its implementation simplicity.

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Section: Implementation Example For Generation Of An Individual Gaussian Rough Surfacementioning

confidence: 99%

Acoustic Scattering Models from Rough Surfaces: A Brief Review and Recent Advances

Darmon

Dorval

Baqué³

2020

Applied Sciences

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“…2× GPP Intel Xeon 5590. The machine contains 2 GPP, consisting each of 6 cores 3.47GHz with Hyperthreading (12 logical cores for each GPP) ; it also disposes of 24GB of memory 1 . This machine is also the one running CIVA 11.0 for reference.…”

Section: Performancesmentioning

confidence: 99%

“…Inspection simulation is used in a lot of non-destructive evaluation (NDE) application : from designing new inspection methods and probes to qualifying methods and demonstrating performances through virtual testing while developing methods. The CIVA software, developed by CEA-LIST and partners is a multi technique platform (Ultrasonic Testing (UT), Computed Tomography and Radiographic Testing) used to both analyze acquisitions and to run simulations validated against international benchmark [1]. It benefits from semi-analytics models and user friendly GUI to design an inspection case with the help of CAD tools and imaging.…”

Section: Introductionmentioning

confidence: 99%

A fast ultrasonic simulation tool based on massively parallel implementations

Lambert¹,

Rougeron²,

Lacassagne³

et al. 2014

AIP Conference Proceedings

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This paper presents a CIVA optimized ultrasonic inspection simulation tool, which takes benefit of the power of massively parallel architectures : graphical processing units (GPU) and multi-core general purpose processors (GPP). This tool is based on the classical approach used in CIVA : the interaction model is based on Kirchoff, and the ultrasonic field around the defect is computed by the pencil method. The model has been adapted and parallelized for both architectures. At this stage, the configurations addressed by the tool are : multi and mono-element probes, planar specimens made of simple isotropic materials, planar rectangular defects or side drilled holes of small diameter. Validations on the model accuracy and performances measurements are presented.

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“…The second model aims to assess the sensitivity of the reading method to the code geometry and its robustness to imperfect settings, such as misalignment and misorientation of the sub-assembly head. The ultrasonic scan is computed by an ultrasonic ray tracing software (CIVA [19]), using the pencil method to derive echoes with their amplitude [20], which allows computational cost much lower than the FEM.…”

Section: Introductionmentioning

confidence: 99%

Numerical simulations in support of the design of an ultrasonic device for sub-assembly identification

2021

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In this paper, it is shown how numerical simulations can help designing an ultrasonic instrument operating in harsh conditions. To prevent fuel handling errors in sodium cooled fast reactors, the identification of fuel sub-assemblies using ultrasound is being investigated. It is based on the interpretation of a code (aligned notches) engraved on the sub-assembly head using an emitting/receiving ultrasonic sensor. This reading is performed in liquid sodium with high temperature (up to 600°C) transducers. A first experiment in liquid sodium demonstrated the feasibility of this method. The reading quality and robustness depend on various parameters related to the ultrasonic beam (spectral response, focal distance, focal spot size), the code geometry (especially the notches’ dimensions) and geometrical alignments. In order to avoid numerous experiments, two numerical models are developed. The first one is a finite element simulation of the sensor providing its radiated field. This model is validated with the well-known analytic solution of the Rayleigh integral; then it is applied to the sensor used in the sodium experiment. The focal distance and focal spot diameter are close to the expected values. The second simulation, using CIVA software, provides the ultrasonic scan of the code. The result is in good agreement with the sodium experiment and a first comparison with a water experiment shows that this numerical tool is relevant for easily taking into account misalignment and misorientation of the scan.

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An Overview of Ultrasonic Beam Propagation and Flaw Scattering Models in the Civa Software

Cited by 14 publications

References 5 publications

Acoustic Scattering Models from Rough Surfaces: A Brief Review and Recent Advances

Acoustic Scattering Models from Rough Surfaces: A Brief Review and Recent Advances

A fast ultrasonic simulation tool based on massively parallel implementations

Numerical simulations in support of the design of an ultrasonic device for sub-assembly identification

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