Review of progress, QNDE

A review of ultrasonic testing applications in additive manufacturing: Defect evaluation, material characterization, and process control.

CIVA: an expertise platform for simulation and processing NDT data.

The CIVA software platform is developed at CEA-LIST and partners in the aim of simulating non-destructive evaluation. Most of the developed models are based on semi-analytical methods since they aren’t heavy on computation time. The ultrasonic simulation tools in CIVA allow to fully predict a real ultrasonic inspection in a various range of applications which requires the computation of the beam propagated, as well as its interaction with flaws. The purpose of this communication is to describe the methods used to model the beam to flaw interaction. Three kinds of models for the scattering of ultrasound by flaws have been integrated in CIVA: approached analytical solutions, exact analytical solutions and numerical modelling methods. Numerous experimental validations of all the developed models are provided including comparisons between different simulation methods. Perspectives of new developments are finally emphasized.

Modelling of scattering of ultrasounds by flaws for NDT

The X-ray radiographic simulation software SINDBAD, has been developed to help the design stage of radiographic systems or to evaluate the efficiency of i mage processing techniques, in both medical imaging and Non-Destructive Evaluation (NDE) industrial fields . This software can model any radiographic set-up, including the X-ray source, the beam interaction inside the object represented by its Computed Aided Design (CAD) model, and the imaging process in the detector. For each step of the virtual experimental bench, SINDBAD combines different modelling modules, accessed via Graphical User Interfaces (GUI), to provide realistic synthetic images. In this paper, we present an overview of all the functionalities which are available in SINDBAD, with a complete description of all the physics taken into account in models as well as the CAD and GUI facili ties available in many computing platforms. We underline the different modules usable for different applic ations which make SINDBAD a multi-purposed and scalable X-ray simulation tool.

/pdf/sindbad-a-realistic-multi-purpose-and-scalable-x-ray-si-2cfx95qo6n.pdf

SINDBAD : a realistic multi-purpose and scalable X-ray si mulation tool for NDT applications

An integrated model to simulate the scattering of ultrasounds by inclusions in steels.

The CEA LIST develops the simulation platform CIVA which includes UT, ECT and RT modules. UT simulation is based on semi-analytical models of the ultrasound propagation and scattering and allows to address a wide range of realistic and complex configurations. Over successive versions, CIVA is enriched by the results of the latest modelling research performed by CEA LIST and its partners. This communication focuses on the recent advances and the current trends in CIVA ultrasonic modelling. One important issue concerns flaw scattering and work is being done in order to integrate in the models complex echo mechanisms not yet taken into account. Thus, contribution of head or creeping waves near critical angles to breaking cracks corner echoes, have been recently integrated in to the echo-formation modelling. In parallel, a hybrid model combining finite element code around the defect and semi-analytical modelling of the beam propagation has been developed. Another work in progress concerns the modelling of noise due to ultrasound scattering by microstructure in polycrystalline materials. At last the development of tools dedicated to array techniques remains a major axis of development. On these different topics the new developments are presented and illustrated by examples of applications and validations.

Recent advances and current trends of ultrasonic modelling in CIVA

We present a study performed to model and predict the ultrasonic response of alumina inclusions in steels. The Born and the extended quasistatic approximations have been applied and modified to improve their accuracy in the framework of this application. The modified Born approximation, allowing to deal with various inclusion shapes, have been selected to be implemented in the CIVA software. The model reliability has been evaluated by comparison with Ying and Truell’s exact analytical solution. In parallel, measurements have been carried out upon both natural and artificial alumina inclusions.

Pierre Calmon

Papers

CIVA: an expertise platform for simulation and processing NDT data.

An integrated model to simulate the scattering of ultrasounds by inclusions in steels.

Recent advances and current trends of ultrasonic modelling in CIVA

Modelling of the Ultrasonic Response of Inclusions in Steels