Case Studies in Nondestructive Testing and Evaluation最新文献_第4页

Automatic non-destructive three-dimensional acoustic coring system for in situ detection of aquatic plant root under the water bottom 用于水下水生植物根系原位检测的自动无损三维声学取芯系统

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-05-01 DOI: 10.1016/j.csndt.2016.01.001

Katsunori Mizuno , Xiaofei Liu , Fuyuki Katase , Akira Asada , Makoto Murakoshi , Yasunobu Yagita , Yasufumi Fujimoto , Tetsuo Shimada , Yoshiaki Watanabe

{"title":"Automatic non-destructive three-dimensional acoustic coring system for in situ detection of aquatic plant root under the water bottom","authors":"Katsunori Mizuno , Xiaofei Liu , Fuyuki Katase , Akira Asada , Makoto Murakoshi , Yasunobu Yagita , Yasufumi Fujimoto , Tetsuo Shimada , Yoshiaki Watanabe","doi":"10.1016/j.csndt.2016.01.001","DOIUrl":"10.1016/j.csndt.2016.01.001","url":null,"abstract":"<div><p>Digging is necessary to detect plant roots under the water bottom. However, such detection is affected by the transparency of water and the working skills of divers, usually requires considerable time for high-resolution sampling, and always damages the survey site. We developed a new automatic non-destructive acoustic measurement system that visualizes the space under the water bottom, and tested the system in the <em>in situ</em> detection of natural plant roots. The system mainly comprises a two-dimensional waterproof stage controlling unit and acoustic measurement unit. The stage unit was electrically controlled through a notebook personal computer, and the space under the water bottom was scanned in a two-dimensional plane with the stage unit moving in steps of 0.01 m (±0.0001 m). We confirmed a natural plant root with diameter of 0.025–0.030 m in the reconstructed three-dimensional acoustic image. The plant root was at a depth of about 0.54 m and the propagation speed of the wave between the bottom surface and plant root was estimated to be 1574 m/s. This measurement system for plant root detection will be useful for the non-destructive assessment of the status of the space under the water bottom.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"5 ","pages":"Pages 1-8"},"PeriodicalIF":0.0,"publicationDate":"2016-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.01.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78246324","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: 9

The analysis of spot welding joints of steel sheets with closed profile by ultrasonic method 闭合型钢板点焊接头的超声分析

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-11-01 DOI: 10.1016/j.csndt.2015.09.002

Dariusz Ulbrich, Jakub Kowalczyk, Marian Jósko, Jarosław Selech

引用次数: 13

Simulation and measurement of ferromagnetic impurities in non-magnetic aeroengine turbine disks using fluxgate magnetometers 用磁通门磁强计模拟和测量非磁性航空发动机涡轮盘中的铁磁性杂质

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-11-01 DOI: 10.1016/j.csndt.2015.10.001

Sebastian Hantscher , Ruixin Zhou , Albert Seidl , Johann Hinken , Christian Ziep

{"title":"Simulation and measurement of ferromagnetic impurities in non-magnetic aeroengine turbine disks using fluxgate magnetometers","authors":"Sebastian Hantscher , Ruixin Zhou , Albert Seidl , Johann Hinken , Christian Ziep","doi":"10.1016/j.csndt.2015.10.001","DOIUrl":"10.1016/j.csndt.2015.10.001","url":null,"abstract":"<div><p>In this paper, ferromagnetic impurities in paramagnetic aeroengine turbine disks are investigated. Because such inclusions represent a significant threat in aviation, a detailed analysis is required for impured turbine disks. For this purpose, sensitive fluxgate magnetometers are used. After a premagnetisation, this sensor is able to detect small ferromagnetic particles by recording the variation of the magnetic flux density while the disk rotates below the sensor head. This trajectory creates a unique signature. However, the measured signatures are often distorted. A main reason for these distortions is that the particles are not oriented in axial direction (in the direction of the disks axis). Up to now, it was not possible to interpret the measured signatures. Thus, a simulation tool has been developed that provides a catalogue of different magnetic flux density distributions of typical orientations, positions and various distances to the fluxgate magnetometer position. For these simulations, the particles are assumed to be dipoles. As part of impurities are not caused by concentrated particles but by elongated ones, so-called or dipole lines, the model has been expanded for these cases by using numerical integration techniques. Measurements verify the assumption to approximate impurities by dipoles.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"4 ","pages":"Pages 15-20"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2015.10.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82913412","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

Application of microCT to the non-destructive testing of an additive manufactured titanium component 微ct在增材制造钛构件无损检测中的应用

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-11-01 DOI: 10.1016/j.csndt.2015.09.001

Anton du Plessis , Stephan G. le Roux , Johan Els , Gerrie Booysen , Deborah C. Blaine

{"title":"Application of microCT to the non-destructive testing of an additive manufactured titanium component","authors":"Anton du Plessis , Stephan G. le Roux , Johan Els , Gerrie Booysen , Deborah C. Blaine","doi":"10.1016/j.csndt.2015.09.001","DOIUrl":"10.1016/j.csndt.2015.09.001","url":null,"abstract":"<div><p>In this paper the application of X-ray microCT to the non-destructive testing of an additive manufactured titanium alloy component of complex geometry is demonstrated. Additive manufacturing of metal components is fast growing and shows great promise, yet these parts may contain defects which affect mechanical properties of the components. In this work a layered form of defect is found by microCT, which would have been very difficult or impossible to detect by other non-destructive testing methods due to the object complexity, defect size and shape and because the pores are entirely contained inside the object and not connected to the surface. Additionally, this test part was subjected to hot isostatic pressing (HIPPING) and subsequently scanned. Comparing before and after scans by alignment of the volumes allows visualization and quantification of the pore size changes. The application of X-ray microCT to additive manufacturing is thus demonstrated in this example to be an ideal combination, especially for process improvements and for high value components.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"4 ","pages":"Pages 1-7"},"PeriodicalIF":0.0,"publicationDate":"2015-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2015.09.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81692964","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: 72

Evaluating asphalt concrete air void variation via GPR antenna array data 利用探地雷达天线阵列数据评价沥青混凝土空隙变化

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI: 10.1016/j.csndt.2015.03.002

Kyle Hoegh , Lev Khazanovich , Shongtao Dai , Thomas Yu

{"title":"Evaluating asphalt concrete air void variation via GPR antenna array data","authors":"Kyle Hoegh , Lev Khazanovich , Shongtao Dai , Thomas Yu","doi":"10.1016/j.csndt.2015.03.002","DOIUrl":"10.1016/j.csndt.2015.03.002","url":null,"abstract":"<div><p>Air void content is one of the most important characteristics of in-place asphalt concrete, substantially affecting early deterioration and long term performance. Destructive measures at limited locations, such as coring, are typically conducted as part of the air-void content evaluation after the pavement has been fully constructed. In this paper, use of an air coupled step-frequency array system for nondestructive assessment of air-void variability is explored. The dielectric properties of the asphalt were determined from the asphalt surface reflection amplitude of all 21 adjacent transmitting and receiving pairs of the array and related to air void content through plotting of dielectric changes with core measured air void content. This approach is an extension of the procedure developed for a single bistatic antenna pair determining properties within top millimeters of the asphalt surface. While cores provide information concerning bulk properties across the depth, the proposed method with an array system provides an opportunity for increased lateral coverage. The case study demonstrated good repeatability and correspondence with core measured air void content. The array-based method improves the coverage and productivity of the measurements, making it an attractive alternative to current state-of-the-practice procedures.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"3 ","pages":"Pages 27-33"},"PeriodicalIF":0.0,"publicationDate":"2015-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2015.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79381225","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: 44

Characterization of planar flaws by synthetic focusing of sound beam using linear arrays 利用线性阵列声束合成聚焦表征平面缺陷

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI: 10.1016/j.csndt.2015.01.001

Paritosh Nanekar , Anish Kumar , T. Jayakumar

引用次数: 5

X-ray computed tomography of a titanium aerospace investment casting 航空航天钛合金熔模铸件的x射线计算机断层扫描

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI: 10.1016/j.csndt.2015.03.001

Anton du Plessis , Pierre Rossouw

引用次数: 42

Fibre structure characterisation of injection moulded short fibre-reinforced polymers by X-ray scatter dark field tomography 用x射线散射暗场层析成像技术表征注射成型短纤维增强聚合物的纤维结构

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI: 10.1016/j.csndt.2015.04.001

Christian Hannesschläger , Vincent Revol , Bernhard Plank , Dietmar Salaberger , Johann Kastner

{"title":"Fibre structure characterisation of injection moulded short fibre-reinforced polymers by X-ray scatter dark field tomography","authors":"Christian Hannesschläger , Vincent Revol , Bernhard Plank , Dietmar Salaberger , Johann Kastner","doi":"10.1016/j.csndt.2015.04.001","DOIUrl":"10.1016/j.csndt.2015.04.001","url":null,"abstract":"<div><p>X-ray scatter dark field imaging (SDFI) tomography was used to investigate the glass fibre orientation of short fibre-reinforced polymers (SFRPs). The fibre orientation of fibre-reinforced polymers is decisive for the mechanical strength of injection-moulded parts. For this paper four different positions, with volumes along the melt flow and with weld lines, of an injection-moulded part were investigated with SDFI computed tomography with a voxel size of (43 μm)<sup>3</sup> and absorption-based high resolution X-ray computed tomography (XCT) with a voxel size of (6.5 μm)<sup>3</sup>. The results of the SDFI computed tomography are compared with the fibre orientation to investigate the dependence of the SDFI signal on fibre orientation. The exact fibre orientation was determined by evaluation of the high resolution absorption XCT data. In particular, it is shown that the weld line and areas with different fibre orientations can be characterised by SDFI even at a voxel size of (43 μm)<sup>3</sup> and that fibre orientation properties can be detected.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"3 ","pages":"Pages 34-41"},"PeriodicalIF":0.0,"publicationDate":"2015-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2015.04.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74915034","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: 35

Case study of guided wave propagation in a one-side water-immersed steel plate 单面水浸钢板中导波传播的实例研究

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI: 10.1016/j.csndt.2014.11.001

Lingyu Yu, Zhenhua Tian

引用次数: 29

Measurement of working coil temperature in electromagnetic forming processes by means of optical frequency domain reflectometry 用光学频域反射法测量电磁成形过程中工作线圈的温度

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2015-04-01 DOI: 10.1016/j.csndt.2015.02.001

S. Gies , A. Langolf, C. Weddeling, A.E. Tekkaya

{"title":"Measurement of working coil temperature in electromagnetic forming processes by means of optical frequency domain reflectometry","authors":"S. Gies , A. Langolf, C. Weddeling, A.E. Tekkaya","doi":"10.1016/j.csndt.2015.02.001","DOIUrl":"10.1016/j.csndt.2015.02.001","url":null,"abstract":"<div><p>Joule heating losses in the working coil of up to 50% make thermal loads a crucial influencing factor on the coil lifetime in electromagnetic forming processes. Thus, especially in case of discharge sequences with short cycle times knowledge about the temperature distribution is essential to avoid thermal overstressing. This paper presents an approach for temperature measurement inside the working coil during the electromagnetic forming process. Based on fiber-based optical frequency domain reflectometry (OFDR), the spatio-temporal temperature distribution inside the coil is determined. Temperature profiles for long-term discharge sequences are provided. The results prove the qualification of this measurement technique for electromagnetic forming processes. Due to the comparatively high acquisition rate the temperature increase and drop between two discharges can be analyzed in detail. This renders new possibilities for process analysis and monitoring. Especially the effectiveness of approaches aiming at a decrease of thermal loading can be rated easily using the presented measurement technique.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"3 ","pages":"Pages 15-20"},"PeriodicalIF":0.0,"publicationDate":"2015-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2015.02.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78764390","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: 5