Review of progress, QNDE

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

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

The fundamental obstacle to characterising accurately the defects in austenitic welds is the distortion of the sound field due to the anisotropic inhomogeneous material. This paper describes the development of the next generation of ultrasonic procedures which use phased array techniques and models to account for the distortion of the sound field, such that the detection, positioning and sizing of defects is improved in comparison to current capabilities. Each stage of the procedure development is described, along with the issues and obstacles which must be overcome. The electron back-scatter diffraction technique is used to evaluate the texture of the weld and then the microstructural information is input to a model capable of propagating ultrasonic waves through the anisotropic inhomogeneous medium. With knowledge of the distortion, a strategy of adapting the focal laws using time reversal concepts to improve sensitivity was developed.

http://www.dissimilarweld.co.uk/publications/DISSIMILAR_pt1_(Dec,_2009).pdf

Microstructural quantification, modelling and array ultrasonics to improve the inspection of austenitic welds

A refinement of the Kirchhoff approximation to the scattered elastic fields.

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

The 2007 QNDE ultrasonic benchmark session involved researchers from four different institutions around the world. The two studies they considered examined the influence that the curvature of a cylindrical fluid‐solid interface has on the measured NDE immersion test response of a flat‐bottom hole (FBH) reflector. The first study was a model‐based study of the effects of different FBH sizes and curvatures, where the FBHs were all located a specific depth in a solid. The second study compared model‐based predictions with experiments for different interface curvatures and a FBH hole of a fixed size but located at different depths. Here, we will summarize the results obtained and analyze the differences between the different models and between the model‐based results and the experiments.

2007 ultrasonic benchmark studies of interface curvature—a summary

In the 2008 QNDE ultrasonic benchmark session researchers from five different institutions around the world examined the influence that the curvature of a cylindrical fluid‐solid interface has on the measured NDE immersion pulse‐echo response of a flat‐bottom hole (FBH) reflector. This was a repeat of a study conducted in the 2007 benchmark to try to determine the sources of differences seen in 2007 between model‐based predictions and experiments. Here, we will summarize the results obtained in 2008 and analyze the model‐based results and the experiments.

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=1080&context=cnde_conf

2008 ultrasonic benchmark studies of interface curvature—a summary

This paper presents some applications of ultrasonic (UT) simulation codes developed at IZFP, Germany and at CEA LIST, France, those latter being integrated into the CIVA software platform These UT simulation codes are dedicated to the prediction of echo‐responses from flaws Results given and discussed are those obtained for the various problems of the 2007 UT Benchmark modeling session They concern the responses from flat‐bottomed holes inside curved blocks (concave or convex) inspected with immersed probes The simulation codes are used to investigate the influence of the curvature upon the amplitude response of the flaw with respect to a flat specimen, used as a reference Comparison with experimental results is also discussed

Results of the 2007 ut modeling benchmark using two semi‐analytical beam propagation and flaw scattering model

This paper presents the results of the 2008 UT modeling benchmark with the ultrasonic simulation code for predicting echo‐responses from flaws integrated into the Civa software platform and with the code developed by M. Spies. UT configurations addressed are similar to 2007 ones, to better understand some responses obtained last year. Experimental results proposed concern the responses of flat bottom holes at different depths inside surface curved blocks inspected by an immersion probe in normal incidence. They investigate the influence of surface curvature upon the amplitude and shape of flaw responses. Comparison of the simulated and experimental results is discussed.

Results of the 2008 ut modeling benchmark obtained with 2 semi‐analytical models: responses of flat bottom holes at various depths under interfaces of different curvatures

R. Raillon

Papers

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

2007 ultrasonic benchmark studies of interface curvature—a summary

2008 ultrasonic benchmark studies of interface curvature—a summary

Results of the 2007 ut modeling benchmark using two semi‐analytical beam propagation and flaw scattering model

Results of the 2008 ut modeling benchmark obtained with 2 semi‐analytical models: responses of flat bottom holes at various depths under interfaces of different curvatures