Author
L. Le Ber
Bio: L. Le Ber is an academic researcher. The author has contributed to research in topics: Ultrasonic testing & Integration platform. The author has an hindex of 2, co-authored 2 publications receiving 16 citations.
Topics: Ultrasonic testing, Integration platform
Papers
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TL;DR: The French Atomic Energy Commission (CEA) developed expertise software for NDT named CIVA which, at its beginning, only contained ultrasonic models from CEA laboratories as discussed by the authors.
Abstract: Simulation is more and more widely used by the different actors of industrial NDT. The French Atomic Energy Commission (CEA) launched the development of expertise software for NDT named CIVA which, at its beginning, only contained ultrasonic models from CEA laboratories. CIVA now includes Eddy current simulation tools while present work aims at facilitating integration of algorithms and models from different laboratories and to include X‐ray modeling. This communication gives an overview of existing CIVA capabilities and its evolution towards an integration platform.
9 citations
TL;DR: The CIVA software developed at the French Atomic Energy Commission for processing and simulating NDT data includes tools for modeling the whole ultrasonic inspection of a component in which virtual defects are positioned as mentioned in this paper.
Abstract: The CIVA software developed at the French Atomic Energy Commission for processing and simulating NDT data includes tools for modelling the whole ultrasonic inspection of a component in which virtual defects are positioned. In this paper, Kirchhoff’s approximation and reciprocity principle were applied to predict the reception by the transducer of waves scattered by the defect. Results given and discussed are those obtained for the various problems of the 2005 UT benchmark modelling session. These results concern the echographic responses of side drilled holes and cracks using immersed inspection techniques.
7 citations
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TL;DR: The wave propagation modeling is based on an integral formulation of the radiated field and applies the so-called pencil method and the modeling of beam-defect interaction and echoes formation mechanisms apply approximated theories such as Kirchhoff approximation or GTD.
75 citations
28 Mar 2007
TL;DR: In this article, a conformable membrane approach using a standard array transducer is compared with the conformable contact array with a flexible contact phase array for ultrasonic inspection of components with an irregular surface.
Abstract: The purpose of this project is to research and develop new conformable phased arrays that allow reliable ultrasonic inspection of components with an irregular surface. Two alternative approaches have been considered: flexible contact arrays in which the array itself conforms to the surface and a membrane device in which a standard array is coupled to the surface via a fluid‐filled membrane. A linear flexible contact phased array was purchased from CEA France and a conformable membrane device was designed and manufactured at Imperial College. Initial investigations were conducted to evaluate both approaches when coupling to test pieces with machined surfaces representative of typical welded pipes without removal of the weld caps. The research incorporated beam modelling using the CEA CIVA software and comparisons with experimental measurements. It is shown that the conformable membrane approach using a standard array transducer is competitive with the bespoke flexible array.
9 citations
28 Mar 2007
TL;DR: In this paper, an approach based on the Volume Integral Method using the Green dyadic formalism which greatly increases computation efficiency has been developed to handle the configuration of a layered planar structure with a rivet and an embedded flaw nearby.
Abstract: Eddy current technique is currently an operational tool used for fastener inspection which is an important issue for the maintenance of aircraft structures. The industry calls for faster, more sensitive and reliable NDT techniques for the detection and characterization of potential flaws nearby rivet. In order to reduce the development time and to optimize the design and the performances assessment of an inspection procedure, the CEA and EADS have started a collaborative work aiming at extending the modeling features of the CIVA non destructive simulation plat‐form in order to handle the configuration of a layered planar structure with a rivet and an embedded flaw nearby. Therefore, an approach based on the Volume Integral Method using the Green dyadic formalism which greatly increases computation efficiency has been developed. The first step, modeling the rivet without flaw as a hole in a multi‐stratified structure, has been reached and validated in several configurations with experimental data.
7 citations
28 Mar 2007
TL;DR: In this article, the integration of these models into the CIVA platform is discussed, and a new numerical scheme is also proposed in order to improve the accuracy of the model.
Abstract: Eddy current testing (ECT) is widely used in iron and steel industry for the inspection of tubes during manufacturing. A collaboration between CEA and the Vallourec Research Center led to the development of new numerical functionalities dedicated to the simulation of ECT of non‐magnetic tubes by external probes. The achievement of experimental validations led us to the integration of these models into the CIVA platform. Modeling approach and validation results are discussed here. A new numerical scheme is also proposed in order to improve the accuracy of the model.
6 citations