Case Studies in Nondestructive Testing and Evaluation最新文献_第3页

Near field focusing for nondestructive microwave testing at 24 GHz – Theory and experimental verification 24ghz无损微波检测近场聚焦理论与实验验证

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.10.002

Christian Ziehm , Sebastian Hantscher , Johann Hinken , Christian Ziep , Maik Richter

引用次数: 4

Experimental investigation of surface determination process on multi-material components for dimensional computed tomography 多维计算机断层扫描中多材料部件表面测定过程的实验研究

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.04.003

Fabrício Borges de Oliveira , Alessandro Stolfi , Markus Bartscher , Leonardo De Chiffre , Ulrich Neuschaefer-Rube

{"title":"Experimental investigation of surface determination process on multi-material components for dimensional computed tomography","authors":"Fabrício Borges de Oliveira , Alessandro Stolfi , Markus Bartscher , Leonardo De Chiffre , Ulrich Neuschaefer-Rube","doi":"10.1016/j.csndt.2016.04.003","DOIUrl":"10.1016/j.csndt.2016.04.003","url":null,"abstract":"<div><p>The possibility of measuring multi-material components, while assessing inner and outer features simultaneously makes X-ray computed tomography (CT) the latest evolution in the field of coordinate measurement systems (CMSs).</p><p>However, the difficulty in selecting suitable scanning parameters and suitable surface determination settings, limits a better acceptance of CT as a CMS. Moreover, standard CT users are subject to the algorithms and boundary conditions implied by the use of commercial analysis software.</p><p>In this context, this paper is concerned with the experimental evaluation of the influence of surface determination process on multi-material measurements, using functions available in the commercial CT data analysis software Volume Graphics VGStudio Max 2.2.6.</p><p>Calibrated step gauges made of different materials, i.e. PEEK, PPS, and Al were used as reference standards. The step gauges were assembled in such a way as to have different multi-material X-ray absorption ratios. Comparative measurements of mono-material assemblies were performed as well. Different segmentation processes were considered (e.g. ISO-50%, local threshold, region growing, etc.), patch-based bidirectional length analyses were carried out to perform in-material measurements on the assemblies.</p><p>This work discusses the different approaches based on real CT scans, and aims to provide advice on the segmentation process for multi-material measurements.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 93-103"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.04.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88316682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 38

Evaluation of relationships between particle orientation and thermal conductivity in bark insulation board by means of CT and discrete modeling 用CT和离散模型评价树皮保温板颗粒取向与导热系数的关系

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.03.002

Günther Kain , Bernhard Lienbacher , Marius-Catalin Barbu , Bernhard Plank , Klaus Richter , Alexander Petutschnigg

{"title":"Evaluation of relationships between particle orientation and thermal conductivity in bark insulation board by means of CT and discrete modeling","authors":"Günther Kain , Bernhard Lienbacher , Marius-Catalin Barbu , Bernhard Plank , Klaus Richter , Alexander Petutschnigg","doi":"10.1016/j.csndt.2016.03.002","DOIUrl":"10.1016/j.csndt.2016.03.002","url":null,"abstract":"<div><p>Insulation boards made out of larch bark were pressed and scanned with an industrial X-ray computed tomograph (CT) in order to study the structure of the boards and to allow structure-based thermal modeling. The CT images were segmented using a categorization algorithm based on ANOVA. Apart from gaining knowledge about panel porosity, understanding of the inhomogeneous bark boards was enhanced by finding that two main components are prevalent. That knowledge of the board's inner microstructure enabled the application of a numerical model for thermal conductivity based on the finite difference method (FDM). Contrary to simple cut-ups, the application of CT and subsequent modeling enables the evaluation of the effects of particle orientation on a panel's thermal conductivity. Panels with horizontal particles (oriented parallel to the panel plane) proved to have a significantly lower thermal conductivity than panels with vertical particles (oriented orthogonal to the panel plane). This trend could be confirmed by means of the presented modeling approach, which allows further theoretical ex ante optimization in the production process. These findings give the direction for developments of efficient bark insulation panels with well-defined microstructure.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 21-29"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90842317","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 17

Special issue on the 6th conference on industrial computed tomography 2016 (iCT2016) 2016年第六届工业计算机断层扫描大会特刊(iCT2016)

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.007

Johann Kastner (chairman iCT2016 and guest editor CSNDT&E)

引用次数: 12

Comparing cone beam laminographic system trajectories for composite NDT 比较复合材料无损检测的锥束层析系统轨迹

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.004

Neil O'Brien , Mark Mavrogordato , Richard Boardman , Ian Sinclair , Sam Hawker , Thomas Blumensath

引用次数: 8

Investigation of ultrasonic backward energy from various edges as a function of their 2D/3D geometry and of the incidence angle, for application to ultrasonic thermometry at the outlet of a tube 研究了不同边缘的超声反向能量随其二维/三维几何形状和入射角的函数关系，并将其应用于管道出口的超声测温

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.09.001

Marie-Aude Ploix , Gilles Corneloup , Joseph Moysan , Jean-Philippe Jeannot

{"title":"Investigation of ultrasonic backward energy from various edges as a function of their 2D/3D geometry and of the incidence angle, for application to ultrasonic thermometry at the outlet of a tube","authors":"Marie-Aude Ploix , Gilles Corneloup , Joseph Moysan , Jean-Philippe Jeannot","doi":"10.1016/j.csndt.2016.09.001","DOIUrl":"10.1016/j.csndt.2016.09.001","url":null,"abstract":"<div><p>Innovative ultrasonic instrumentation to be used for future Generation IV sodium-cooled fast reactors is currently being investigated. One potential option under study here is the monitoring of the sodium temperature at the outlet of the core by using ultrasound. The main advantage of ultrasonic setups is that they can be used far from the intended subassemblies. The idea is to send an ultrasonic beam at grazing incidence towards the (cylindrical) subassembly head, and to measure the ultrasonic time of flight between the two diametrically opposite edges, in order to estimate the mean temperature across the subassembly outlet diameter. Moreover, the grazing incidence could allow considering the simultaneous temperature monitoring of several aligned subassemblies. One of the main points to be considered is the interaction between the ultrasonic beam and the immersed target, which involves specular reflection and/or diffraction, both phenomena depending on the incidence angle and the target geometry. The present paper investigates this interaction, mainly from an experimental point of view. Different geometries of “2D” (plate) and “3D” (tube) edges are tested and compared under various incidence angles. The final aim is to identify an optimal ultrasonic configuration to perform thermometry at the outlet of an immersed tube.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 38-44"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.09.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84322463","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Comparison of medical and industrial X-ray computed tomography for non-destructive testing 用于无损检测的医用和工业x射线计算机断层扫描的比较

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.07.001

Anton du Plessis , Stephan Gerhard le Roux , Anina Guelpa

{"title":"Comparison of medical and industrial X-ray computed tomography for non-destructive testing","authors":"Anton du Plessis , Stephan Gerhard le Roux , Anina Guelpa","doi":"10.1016/j.csndt.2016.07.001","DOIUrl":"10.1016/j.csndt.2016.07.001","url":null,"abstract":"<div><p>Industrial X-ray computed tomography (CT) is an emerging laboratory-based non-destructive testing technique used in a variety of applications for samples ranging from 1 mm to usually 300 mm in diameter. Usually, microCT scanners are used for industrial non-destructive testing due to the superior resolution possible compared to medical CT scanners, but it is not generally known that medical CT scanners can produce reasonable results when high resolution is not needed. As demonstrated in this case study of very dense objects, far shorter scan time is required, compared to conventional laboratory industrial CT systems, consequently being a better solution for applications such as quick scout-scans, high throughput applications and larger objects. This case study makes use of four typical industrial test objects, specifically chosen as candidates which would be expected to be too dense for relatively low-voltage medical scanners. The respective test objects were scanned with both medical and microCT scanners and the results compared for the purpose of industrial non-destructive analysis. The test objects are a steel turbine blade, a titanium casting, a concrete cylinder with aggregate stones and porosity, and a concrete block with metal fiber reinforcement.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 17-25"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.07.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84622350","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 78

Comparison of surface-based and image-based quality metrics for the analysis of dimensional computed tomography data 三维计算机断层扫描数据分析中基于表面和基于图像的质量度量的比较

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.002

Francisco A. Arenhart , Vitor C. Nardelli , Gustavo D. Donatelli

引用次数: 8

Characterization of medical and biological samples with a Talbot–Lau grating interferometer μXCT in comparison to reference methods 塔尔博特-劳光栅干涉仪μXCT表征医学和生物样品与参考方法的比较

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.02.001

Christian Gusenbauer , Elisabeth Leiss-Holzinger , Sascha Senck , Katrin Mathmann , Johann Kastner , Stefan Hunger , Wolfgang Birkfellner

引用次数: 15

Fabrication of imitative cracks by 3D printing for electromagnetic nondestructive testing and evaluations 用于电磁无损检测与评价的3D打印模拟裂纹的制备

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-05-01 DOI: 10.1016/j.csndt.2016.03.004

Noritaka Yusa, Weixi Chen, Jing Wang, Hidetoshi Hashizume

{"title":"Fabrication of imitative cracks by 3D printing for electromagnetic nondestructive testing and evaluations","authors":"Noritaka Yusa, Weixi Chen, Jing Wang, Hidetoshi Hashizume","doi":"10.1016/j.csndt.2016.03.004","DOIUrl":"10.1016/j.csndt.2016.03.004","url":null,"abstract":"<div><p>This study demonstrates that 3D printing technology offers a simple, easy, and cost-effective method to fabricate artificial flaws simulating real cracks from the viewpoint of eddy current testing. The method does not attempt to produce a flaw whose morphology mirrors that of a real crack but instead produces a relatively simple artificial flaw. The parameters of this flaw that have dominant effects on eddy current signals can be quantitatively controlled. Three artificial flaws in type 316L austenitic stainless steel plates were fabricated using a powderbed-based laser metal additive manufacturing machine. The three artificial flaws were designed to have the same length, depth, and opening but different branching and electrical contacts between flaw surfaces. The flaws were measured by eddy current testing using an absolute type pancake probe. The signals due to the three flaws clearly differed from each other although the flaws had the same length and depth. These results were supported by subsequent destructive tests and finite element analyses.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"5 ","pages":"Pages 9-14"},"PeriodicalIF":0.0,"publicationDate":"2016-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75284391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 10