Case Studies in Nondestructive Testing and Evaluation最新文献

Influence of surface roughness on X-ray computed tomography dimensional measurements of additive manufactured parts 表面粗糙度对增材制造零件x射线计算机断层扫描尺寸测量的影响

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.005

Valentina Aloisi, Simone Carmignato

{"title":"Influence of surface roughness on X-ray computed tomography dimensional measurements of additive manufactured parts","authors":"Valentina Aloisi, Simone Carmignato","doi":"10.1016/j.csndt.2016.05.005","DOIUrl":"10.1016/j.csndt.2016.05.005","url":null,"abstract":"<div><p>In many industrial applications, components characterized by high surface roughness are measured by X-ray computed tomography (CT). This is the case, for example, of additive manufactured parts. Surface roughness has a strong influence on CT dimensional measurements, causing relevant measurement deviations with respect to tactile reference measurements by coordinate measuring machines (CMMs), especially for parts characterized by high surface roughness. It comes that roughness effects on CT dimensional measurements must be quantified.</p><p>In this work, the influence of surface roughness on CT dimensional measurements, and the relation between tactile CMM and CT measurements are studied. Effects of larger as well as smaller surface roughness are taken into account, by means of three different additive manufactured samples characterized by different roughness. Experimental results prove the presence of a systematic error between tactile and CT measurements; the relation between this error and the <em>Rz</em> roughness parameter of the surface is analyzed.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.05.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76942584","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: 43

Dual energy CT inspection of a carbon fibre reinforced plastic composite combined with metal components 碳纤维增强塑料复合材料与金属构件结合的双能CT检测

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.001

Daniel Vavrik , Jan Jakubek , Ivana Kumpova , Martin Pichotka

引用次数: 22

High resolution pore size analysis in metallic powders by X-ray tomography 用x射线断层扫描分析金属粉末的高分辨率孔径

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.09.002

K. Heim , F. Bernier , R. Pelletier , L.-P. Lefebvre

{"title":"High resolution pore size analysis in metallic powders by X-ray tomography","authors":"K. Heim , F. Bernier , R. Pelletier , L.-P. Lefebvre","doi":"10.1016/j.csndt.2016.09.002","DOIUrl":"10.1016/j.csndt.2016.09.002","url":null,"abstract":"<div><p>The deployment of additive manufacturing processes relies on part quality, specifically the absence of internal defects. Some of those defects have been associated with porosities in the powder feedstock. Since the level of porosity in the powder is generally very low, standard characterisation techniques such as pycnometry and metallography are not suitable for quantification. However, the quantification of such micro sized porosity in metallic powders is crucial to better understand the potential source of internal defects in final components and for quality control purposes. X-ray tomography with a 3 μm resolution offers the possibility to visualise pores in large volume of powder and to quantify their geometrical features and volume fraction using image analysis routines. This combination is unique and demonstrates the power of the approach in comparison to standard powder characterisation techniques. Results presented show the prospects and limits of this technique depending on the imaging device, material and image analysis procedure.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.09.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87915305","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: 50

An innovative vehicle-mounted GPR technique for fast and efficient monitoring of tunnel lining structural conditions 一种创新的车载探地雷达技术，用于快速有效地监测隧道衬砌结构状况

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.10.001

Yuewen Zan , Zhilin Li , Guofeng Su , Xiyuan Zhang

{"title":"An innovative vehicle-mounted GPR technique for fast and efficient monitoring of tunnel lining structural conditions","authors":"Yuewen Zan , Zhilin Li , Guofeng Su , Xiyuan Zhang","doi":"10.1016/j.csndt.2016.10.001","DOIUrl":"10.1016/j.csndt.2016.10.001","url":null,"abstract":"<div><p>The health status of a railway tunnel should be regularly inspected during its service period to ensure safe operation. Ground-penetrating radar (GPR) has been used as a key technique for tunnel detection; however, so far, the measurements of GPR are only obtainable in contact mode. Such methods cannot meet the requirements of the operational tunnel disease census and regular inspections. Therefore, a new method—vehicle-mounted GPR with long-range detection—has been developed. It consists of six channels. The distance from its air-launched antenna to the tunnel lining is approximately 0.93 m–2.25 m. The scanning rate of each channel is 976 1/s. When the sampling point interval is 5 cm, the maximum speed can reach up to 175 km/h. With its speed and air-launched antenna, this system has a significant advantage over existing methods. That is, for an electrified railway, there is no need for power outages. Indeed, the proposed system will not interrupt normal railway operation. Running tests were carried out on the Baoji–Zhongwei and Xiangfan–Chongqing railway lines, and very good results were obtained.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.10.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86712091","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: 27

Micro-CT image calibration to improve fracture aperture measurement 微ct图像校正改进裂缝孔径测量

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.03.001

Hamed Lamei Ramandi, Ryan T. Armstrong, Peyman Mostaghimi

{"title":"Micro-CT image calibration to improve fracture aperture measurement","authors":"Hamed Lamei Ramandi, Ryan T. Armstrong, Peyman Mostaghimi","doi":"10.1016/j.csndt.2016.03.001","DOIUrl":"10.1016/j.csndt.2016.03.001","url":null,"abstract":"<div><p>A novel technique for the accurate measurement and adjustment of fracture apertures in digital images of fractured media is presented. We utilize X-ray micro-computed tomography to image a highly fractured coal sample and collect high-resolution scanning electron microscope (SEM) images from the samples surface to facilitate segmentation of coal fractures. The gray-scale micro-CT values at the mid-point of fractures are obtained and correlated to aperture sizes measured with the higher resolution SEM data. Afterwards, the micro-CT images are upsampled to enable assignment of aperture sizes smaller than the image resolution. We initially segment the coal image, upsample the segmented image, and then re-calibrate the fracture aperture sizes. The final calibrated segmented image contains the fracture network acquired from the micro-CT data with precise aperture sizes assigned based on the high-resolution SEM data. To illustrate the importance of accurate aperture measurement, two coal subsets are tested. The permeabilities before and after applying the calibration method are measured. The results show a significant change in numerical permeabilities after applying the calibration method. This indicates that a large amount of information is potentially omitted when utilizing standard image segmentation tools to segment fractured media.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.03.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80082627","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: 49

Experimental and analytical vibration serviceability assessment of an in-service footbridge 在役人行桥振动性能试验与分析评价

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.11.001

Amir Gheitasi , Osman E. Ozbulut , Salman Usmani , Mohamad Alipour , Devin K. Harris

{"title":"Experimental and analytical vibration serviceability assessment of an in-service footbridge","authors":"Amir Gheitasi , Osman E. Ozbulut , Salman Usmani , Mohamad Alipour , Devin K. Harris","doi":"10.1016/j.csndt.2016.11.001","DOIUrl":"10.1016/j.csndt.2016.11.001","url":null,"abstract":"<div><p>This paper discusses vibration serviceability assessment of a highly trafficked local footbridge based on the experimental tests and analytical studies. The selected bridge is an approximately 60 m (196 ft) long multi-span steel structure with a continuous reinforced concrete slab supported on two longitudinal steel girders. The experimental study consists of ambient vibration and pedestrian interaction tests to describe the dynamic characteristics of the selected bridge structure. The fundamental frequency of the bridge in the vertical direction obtained through ambient vibration tests was within the critical range described by available design guidelines. This required further analysis to assess the performance of the bridge relative to the maximum acceleration thresholds. In addition to the peak dynamic response obtained from the pedestrian interaction tests, peak acceleration values were calculated analytically based on current design guidelines and compared to the comfort limits. Results from both experimental and analytical studies suggest that the footbridge possesses satisfactory serviceability performance under low and dense traffic conditions, but the comfort level under very dense traffic loads was classified as minimum according to the results of the analytical calculations.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.11.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72780356","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: 30

Impact damages detection on composite materials by THz imaging 太赫兹成像对复合材料冲击损伤的检测

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.09.003

Fabien Destic , Christophe Bouvet

引用次数: 22

First special issue of case study in nondestructive testing and evaluation 第一期无损检测与评价案例研究特刊

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.009

Bernd Köhler (Editor-in-Chief)

引用次数: 0

ISO test survey on material influence in dimensional computed tomography 尺寸计算机断层扫描中材料影响的ISO试验调查

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.04.001

Markus Bartscher, Jens Illemann, Ulrich Neuschaefer-Rube

{"title":"ISO test survey on material influence in dimensional computed tomography","authors":"Markus Bartscher, Jens Illemann, Ulrich Neuschaefer-Rube","doi":"10.1016/j.csndt.2016.04.001","DOIUrl":"10.1016/j.csndt.2016.04.001","url":null,"abstract":"<div><p>ISO/TC 213/WG 10 is responsible for creating international standards (series ISO 10360) for the acceptance testing of coordinate measuring systems (CMSs). A current topic is creating a future part of ISO 10360 for CMSs using dimensional computed tomography (CT). The discussion is focussed on how to include material thickness influence in acceptance testing. ISO/TC 213/WG 10 decided to perform an experimental survey to study this topic. This ISO test survey covers several national metrology institutes and manufacturers. Reference standards under study made of aluminium are two step cylinders provided by the National Metrology Institute of Japan (NMIJ), and two hole plates provided by the Physikalisch-Technische Bundesanstalt (PTB), Germany. To check for residual errors of CT-based CMSs, additional reference standards may be measured by participants. This report details results and experiences of the participant PTB. PTB applied scaling reference measurements of a multi-sphere standard and a printed circuit board as additional reference standards, i.e. in addition to hole plate and step cylinder measurements, respectively. Measurements were performed in mid 2015 using the PTB dimensional CT system (Nikon Metrology MCT225). In this contribution, special focus is placed on the interpretation of the results and the consequences of a potential testing regime. This text does not directly describe an existing ISO standard nor a published or intended ISO standard draft. It is intended to contribute to the research of influence parameters which are relevant for a possible future part of ISO 10360 for the case of CT-based CMS (which is assumed to be part 11).</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.04.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90096450","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: 33

Visual classification of braided and woven fiber bundles in X-ray computed tomography scanned carbon fiber reinforced polymer specimens x射线计算机断层扫描碳纤维增强聚合物样品中编织和编织纤维束的视觉分类

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 DOI: 10.1016/j.csndt.2016.05.006

Johannes Weissenböck , Arindam Bhattacharya , Bernhard Plank , Christoph Heinzl , Johann Kastner

{"title":"Visual classification of braided and woven fiber bundles in X-ray computed tomography scanned carbon fiber reinforced polymer specimens","authors":"Johannes Weissenböck , Arindam Bhattacharya , Bernhard Plank , Christoph Heinzl , Johann Kastner","doi":"10.1016/j.csndt.2016.05.006","DOIUrl":"10.1016/j.csndt.2016.05.006","url":null,"abstract":"<div><p>In recent years, advanced composite materials such as carbon fiber reinforced polymers (CFRP) are used in many fields of application (e.g., automotive, aeronautic and leisure industry). These materials are characterized by their high stiffness and strength, while having low weight. Especially, woven carbon fiber reinforced materials have outstanding mechanical properties due to their fabric structure. To analyze and develop the fabrics, it is important to understand the course of the individual fiber bundles. Industrial 3D X-ray computed tomography (XCT) as a nondestructive testing method allows resolving these individual fiber bundles. In this paper, we show our findings when applying the method of Bhattacharya et al. <span>[6]</span> for extracting fiber bundles on two new types of CFRP specimens. One specimen contains triaxial braided plies in an RTM6 resin and another specimen woven bi-diagonal layers. Furthermore, we show the required steps to separate the individual bundles and the calculation of the individual fiber bundles characteristics which are essential for the posterior visual analysis and exploration. We further demonstrate the classification of the individual fiber bundles within the fabrics to support the domain experts in perceiving the weaving structure of XCT scanned specimens.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.05.006","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77135065","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: 6