Case Studies in Nondestructive Testing and Evaluation最新文献_第2页

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 Epub Date: 2016-05-19 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":"6 ","pages":"Pages 39-46"},"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

Incorporating transmitter–receiver offset to interpret pavement layer thicknesses by GPR 结合收发偏置进行探地雷达路面层厚度解译

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-11-29 DOI: 10.1016/j.csndt.2016.11.002

M.U. Ahmed, R.A. Tarefder , A.K. Maji

{"title":"Incorporating transmitter–receiver offset to interpret pavement layer thicknesses by GPR","authors":"M.U. Ahmed, R.A. Tarefder , A.K. Maji","doi":"10.1016/j.csndt.2016.11.002","DOIUrl":"10.1016/j.csndt.2016.11.002","url":null,"abstract":"<div><p>This study evaluates the necessity of considering Transmitter–Receiver (T–R) offset distance for predicting pavement layer thicknesses from two-way travel time data captured by a Ground Penetrating Radar (GPR) antenna. For the purpose of this study, GPR testing was conducted at an instrumented pavement section at Milepost (MP) 141 on Interstate I-40 near Albuquerque, New Mexico, USA. The GPR system used for this study consists of 2.0 GHz air-launched, 900 MHz ground-coupled, and 400 MHz ground-coupled antennas. The entire instrumented test section was tested with different antenna configurations. The two-way travel time is used for calculating layer thicknesses using two approaches: one considering the T–R offset, which is a non-conventional approach and the other without considering the T–R offset, which is a conventional approach. Statistical analysis namely, <em>t</em>-test is performed on the predicted layer thicknesses from these two approaches. The analysis indicates that these two approaches are significantly different. The predicted thicknesses by these two approaches are compared to each other. It is observed that the approach considering the T–R offset predicts the layer thicknesses with better accuracy compared to the conventional approach. Therefore, it is recommended to use the T–R offset in predicting pavement layer thickness from GPR data.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 94-104"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.11.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88633294","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

Fast inline inspection by Neural Network Based Filtered Backprojection: Application to apple inspection 基于过滤反投影的神经网络快速内联检测:在苹果检测中的应用

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-03-31 DOI: 10.1016/j.csndt.2016.03.003

Eline Janssens , Luis F. Alves Pereira , Jan De Beenhouwer , Ing Ren Tsang , Mattias Van Dael , Pieter Verboven , Bart Nicolaï , Jan Sijbers

引用次数: 13

Eddy current analysis of shipped stainless steel heat exchanger bundle 不锈钢热交换器管束的涡流分析

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-11-12 DOI: 10.1016/j.csndt.2016.11.003

J.D. Angelo , A. Bennecer , P. Picton , S. Kaczmarczyk , A. Soares

{"title":"Eddy current analysis of shipped stainless steel heat exchanger bundle","authors":"J.D. Angelo , A. Bennecer , P. Picton , S. Kaczmarczyk , A. Soares","doi":"10.1016/j.csndt.2016.11.003","DOIUrl":"10.1016/j.csndt.2016.11.003","url":null,"abstract":"<div><p>In this paper, we present the results of a failure analysis done on new heat exchanger tubes, which shows loss of thickness during a EC inspection to stablish a prior loss of thickness base line aiming guarantee fitness for service during its working life. The root cause analysis indicates that there is intergranular corrosion due a differential concentration caused by seawater evaporation inside the tubes during the ship transit from the port of origin in China to the destination port in Brazil.</p><p>The intergranular corrosion depth showed by root cause failure analysis is smaller than that showed by EC inspection. We attribute the EC inspection results deviation to a tube magnetisation due to mechanical stress and to a secondary phase due to an incomplete solubilisation after tube conforming and welding.</p><p>Traditionally, these tubes are visually inspected and deemed acceptable but our conclusions reveal that eddy current testing is capable of detecting some corrosion anomalies which makes the tubes unfit for service.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 89-93"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.11.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83981545","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

Characterization of pearls by X-ray phase contrast imaging with a grating interferometer 用光栅干涉仪的x射线相衬成像表征珍珠

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-06-08 DOI: 10.1016/j.csndt.2016.06.001

Vincent Revol , Carina Hanser , Michael Krzemnicki

引用次数: 10

Reference object for evaluating the accuracy of porosity measurements by X-ray computed tomography 评价x射线计算机断层扫描孔隙度测量精度的参考对象

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-05-13 DOI: 10.1016/j.csndt.2016.05.003

Petr Hermanek, Simone Carmignato

{"title":"Reference object for evaluating the accuracy of porosity measurements by X-ray computed tomography","authors":"Petr Hermanek, Simone Carmignato","doi":"10.1016/j.csndt.2016.05.003","DOIUrl":"10.1016/j.csndt.2016.05.003","url":null,"abstract":"<div><p>Internal defects such as voids and porosity directly influence mechanical properties, durability, service life and other characteristics of industrial parts. There are several non-destructive and destructive methods for defects detection and evaluation. Recently, X-ray Computed Tomography (CT) has emerged as an effective tool for geometrical characterization of internal defects. 3D information about internal voids/porosity extracted from CT datasets can be utilized in many applications, such as production processes optimization and quality control. However, there are still challenges in using CT as a traceable method for internal voids dimensional measurements. In order to enhance the accuracy and reliability of CT porosity measurements, a metrological validation method is required.</p><p>This study presents the application of a new reference object for accuracy evaluation of CT porosity measurements and discusses results obtained by using it. The reference object is made of aluminium and is composed of a cylindrical body and four cylindrical inserts with micro-milled hemispherical features of calibrated sizes resembling artificial flaws. The accuracy of porosity measurements is evaluated according to various characteristics (diameters and depths measurements errors) and repeatability of measurements. Design of experiments technique is used to investigate the influence of CT parameters settings on porosity measurement accuracy.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 122-127"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.05.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78179981","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

Robotic ultrasonic testing of AGR fuel cladding AGR燃料包壳的机器人超声检测

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-08-13 DOI: 10.1016/j.csndt.2016.08.001

Maxim Morozov , S. Gareth Pierce , Gordon Dobie , Gary T. Bolton , Thomas Bennett

{"title":"Robotic ultrasonic testing of AGR fuel cladding","authors":"Maxim Morozov , S. Gareth Pierce , Gordon Dobie , Gary T. Bolton , Thomas Bennett","doi":"10.1016/j.csndt.2016.08.001","DOIUrl":"10.1016/j.csndt.2016.08.001","url":null,"abstract":"<div><p>The purpose of the presented work was to undertake experimental trials to demonstrate the potential capabilities of a novel in-situ robotic ultrasonic scanning technique for measuring and monitoring loss of the cladding wall thickness in fuel pins of Advanced Gas-cooled Reactors using non-radioactive samples. AGR fuel pins are stainless steel cylindrical ribbed pipes of inner diameter of the rod being about 15 mm and wall thickness of about 300 μm. Spent AGR fuel pins are stored in a water pond and thus may be prone to corrosion and stress-corrosion cracking under adverse conditions. An ultrasonic immersion transducer with central frequency of 25 MHz was used to measure wall thickness of the AGR fuel cladding. The novelty of the approach consists in the usage of a frequency domain technique to measure the wall thickness combined with cylindrical ultrasonic scanning of the samples performed using an industrial robotic manipulator. The frequency domain approach could detect wall thicknesses in the range 96 μm to 700 μm with a resolution of about 10 μm. In addition to the frequency domain measurements, using conventional time domain techniques, it was possible to detect very short (2.5 mm long) and shallow (100 μm in depth) crack-like defects in the fuel cladding.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 26-31"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.08.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75551832","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: 4

CT-based quality control of Laser Sintering of Polymers 基于ct的聚合物激光烧结质量控制

Case Studies in Nondestructive Testing and Evaluation Pub Date : 2016-11-01 Epub Date: 2016-05-06 DOI: 10.1016/j.csndt.2016.04.004

Michele Pavan , Tom Craeghs , Raf Verhelst , Olivier Ducatteeuw , Jean-Pierre Kruth , Wim Dewulf

{"title":"CT-based quality control of Laser Sintering of Polymers","authors":"Michele Pavan , Tom Craeghs , Raf Verhelst , Olivier Ducatteeuw , Jean-Pierre Kruth , Wim Dewulf","doi":"10.1016/j.csndt.2016.04.004","DOIUrl":"10.1016/j.csndt.2016.04.004","url":null,"abstract":"<div><p>Laser Sintering (LS) is an Additive Manufacturing (AM) technology for polymers processing which is increasingly being used to produce functional products with designs not achievable with traditional manufacturing technologies. Lightweight cellular structures are a good example of complex designs which are increasingly finding applications in AM parts. However, it is not yet clear how the LS process affects the porosity and geometrical characteristics of the cell structural elements. Getting this information allows to perform quality control of the LS process, gives insights into how to improve it, and might help to take into account manufacturing process variability during the design phase.</p><p>In this work a test artifact containing cylindrical elements with diameters in the range typically used in lightweight cellular structures is used to investigate the influence of features' size and printing orientation on the porosity and shape deviation of each feature. In order to assess the reproducibility of the process, several replicas of the test object are produced in polyamide-12 (PA12) using the same LS process conditions. An X-ray Computed Tomography (CT)-based quality control approach, which uses both image processing of CT-slices and porosity analysis (porosity content, pores count and pores volume distributions) is used to gather the information.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"6 ","pages":"Pages 62-68"},"PeriodicalIF":0.0,"publicationDate":"2016-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2016.04.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80497714","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

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 Epub Date: 2016-05-31 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 Epub Date: 2016-06-01 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