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Case Studies in Nondestructive Testing and Evaluation最新文献

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MRT detection of fretting fatigue cracks in a cableway locked coil rope 索道锁卷绳微动疲劳裂纹的MRT检测
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.09.001
L. Collini , F. Degasperi
{"title":"MRT detection of fretting fatigue cracks in a cableway locked coil rope","authors":"L. Collini ,&nbsp;F. Degasperi","doi":"10.1016/j.csndt.2014.09.001","DOIUrl":"10.1016/j.csndt.2014.09.001","url":null,"abstract":"<div><p>The Magnetic Rope Testing is a non-destructive method in use for the detection of flaws and cracks in steel wire ropes. Given the severe protocol of safety certification for in-service cableway ropes, a proper methodology operating in accordance with new European standard specifications is here presented. A relevant experience about detection of multiple cracks due to fretting fatigue on a peculiar locked coil structure rope is also shown and discussed.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 64-70"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.09.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89928934","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
Approach to identify misaligned dowel and tie bars in concrete pavements using ground penetrating radar 利用探地雷达识别混凝土路面定位杆和拉杆错位的方法
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.06.001
Cherif Amer-Yahia Ph.D., P.E. , Todd Majidzadeh
{"title":"Approach to identify misaligned dowel and tie bars in concrete pavements using ground penetrating radar","authors":"Cherif Amer-Yahia Ph.D., P.E. ,&nbsp;Todd Majidzadeh","doi":"10.1016/j.csndt.2014.06.001","DOIUrl":"10.1016/j.csndt.2014.06.001","url":null,"abstract":"<div><p>Dowels are used in jointed concrete pavements to provide load transfer and improve performance. Misaligned dowels could cause poor joint performance that would lead to pavement distresses. An approach to detect misaligned dowel bars in concrete pavements using GPR is proposed. The paper addresses all forms and combinations of dowel misalignment. Equations were developed to identify each misalignment type, and statistical analyses were performed on major categories for the entire project. A decision on the acceptance or rejection of a dowel bar, a joint, or a pavement section, can be made based on the results of the computations and specified tolerance values.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 14-26"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.06.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80666631","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: 12
Serviceability assessment of the Góis footbridge using vibration monitoring 利用振动监测对Góis人行桥的可用性进行评估
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.10.001
Rolando Salgado , Jorge M. Branco , Paulo J.S. Cruz , Gustavo Ayala
{"title":"Serviceability assessment of the Góis footbridge using vibration monitoring","authors":"Rolando Salgado ,&nbsp;Jorge M. Branco ,&nbsp;Paulo J.S. Cruz ,&nbsp;Gustavo Ayala","doi":"10.1016/j.csndt.2014.10.001","DOIUrl":"10.1016/j.csndt.2014.10.001","url":null,"abstract":"<div><p>Footbridges are structures that may experience vibration amplification problems caused by pedestrian and/or wind actions. Design codes deal with these phenomena limiting the natural frequencies and the maximum accelerations expected. Aiming at taking into consideration these dynamic phenomena, current procedures to evaluate the structural performance of light-weight bridges based on experimental dynamic analysis are evaluated in this study. To achieve this, the dynamic response of three pedestrians walking, running and jumping was obtained. Maximum comfort limits of dynamic responses were then determined. The results indicate that codes could overestimate the level of vibration in this kind of footbridge.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 71-76"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.10.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75592219","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: 18
Low frequency and boundary condition effects on impedance based damage identification 低频和边界条件对阻抗损伤识别的影响
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.05.001
C. Bharathi Priya , A. Likhith Reddy , G.V. Rama Rao , N. Gopalakrishnan , A. Rama Mohan Rao
{"title":"Low frequency and boundary condition effects on impedance based damage identification","authors":"C. Bharathi Priya ,&nbsp;A. Likhith Reddy ,&nbsp;G.V. Rama Rao ,&nbsp;N. Gopalakrishnan ,&nbsp;A. Rama Mohan Rao","doi":"10.1016/j.csndt.2014.05.001","DOIUrl":"10.1016/j.csndt.2014.05.001","url":null,"abstract":"<div><p>Details of the investigations on the application of Electro Mechanical Impedance (EMI) technique using smart piezoelectric (PZT) sensors for damage detection of structures are presented in this paper. The behavior and the ability of this method to detect damages, in a homogenous material are studied for its effective utilization in structural health monitoring. Experimental investigations are conducted on a homogenous aluminium plate bonded with PZT patches to study the effects of external low frequency vibrations (mass loading) and boundary condition on EMI signatures and the observations are discussed using RMSD as damage index computed between pristine and damaged states. Effect of low frequency vibration on the resulting EMI signature and the corresponding RMSD is found to be less than 2%. This is the threshold upper control value (UCL) beyond which the change in RMSD shall truly reflect the damage.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 9-13"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.05.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89429780","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: 19
Deconvolution processing for improved acoustic wavefield imaging 改进声波场成像的反卷积处理
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.10.002
Christian Kexel, Jochen Moll
{"title":"Deconvolution processing for improved acoustic wavefield imaging","authors":"Christian Kexel,&nbsp;Jochen Moll","doi":"10.1016/j.csndt.2014.10.002","DOIUrl":"10.1016/j.csndt.2014.10.002","url":null,"abstract":"<div><p>Sparse sensor networks for Lamb wave-based structural health monitoring (SHM) can detect defects in plate-like structures. However, the limited number of sensor positions provides little information to characterize the unknown scatterer. This can be achieved by full wavefield analysis e.g. using Laser Doppler vibrometry measurements.</p><p>This paper proposes deconvolution processing that enhances the acoustic wavefield interpretation by increasing the temporal resolution of the underlying ultrasound signals. Applying this preprocessor to the whole wavefield allows improved non-destructive assessment of the defect. This approach is verified experimentally through a case study on an isotropic aluminum plate with four cracks.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 77-83"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.10.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73008724","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
Dispersion of ultrasonic surface waves in a steel–epoxy–concrete bonding layered medium based on analytical, experimental, and numerical study 基于分析、实验和数值研究的超声表面波在钢-环氧树脂-混凝土粘结层状介质中的弥散
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.07.002
Yang Shen , Sohichi Hirose , Yuya Yamaguchi
{"title":"Dispersion of ultrasonic surface waves in a steel–epoxy–concrete bonding layered medium based on analytical, experimental, and numerical study","authors":"Yang Shen ,&nbsp;Sohichi Hirose ,&nbsp;Yuya Yamaguchi","doi":"10.1016/j.csndt.2014.07.002","DOIUrl":"10.1016/j.csndt.2014.07.002","url":null,"abstract":"<div><p>The epoxy-bonded steel plate strengthening method has been widely applied in retrofitting reinforced concrete structures. However, using epoxy as the adhesive will bring deterioration due to its aging and delamination. Ultrasonic Nondestructive Evaluation (NDE) is an advantaged approach to detect the delamination or the bonding quality of the layered medium. The elastic property of the adhesive material can also be estimated properly by obtaining the phase velocity of surface wave through NDE test. This research proposes an approach to estimate the elastic property of epoxy layer in a steel–epoxy–concrete bonding layered medium. By solving dispersion equations, the analytical dispersion curves are plotted. Then the influence factors to the modes and shapes of those dispersion curves are discussed. An ultrasonic NDE test on a specimen is conducted, by which the relation between phase velocity and frequency is obtained. Through inversion process, the elastic property of epoxy layer is estimated. Based on the estimated elastic constants, a numerical study of steel–epoxy–concrete layered medium is also conducted using Explicit Finite Element Method, from which the numerical dispersion curves are obtained. Through analytical, experimental, and numerical studies, the dispersion property of surface waves in the layered medium is well understood.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 49-63"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74708876","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: 21
Dynamic behaviour of an asymmetric building: Experimental and numerical studies 非对称建筑的动力特性:实验和数值研究
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.07.001
Q.-B. Bui , S. Hans , C. Boutin
{"title":"Dynamic behaviour of an asymmetric building: Experimental and numerical studies","authors":"Q.-B. Bui ,&nbsp;S. Hans ,&nbsp;C. Boutin","doi":"10.1016/j.csndt.2014.07.001","DOIUrl":"10.1016/j.csndt.2014.07.001","url":null,"abstract":"<div><p>The paper presents a study on the seismic assessment of a 21-story building having an asymmetrical plan. The study applies the approach using in-situ measurements to assess the building's seismic performance. According to preliminary observations on site, the soil may have a significant influence on the building's behaviour. That is why it is important to isolate the behaviour of the building from the soil effect (fixed-base structure). First, in-situ dynamic measurements are conducted to identify dynamic characteristics of the building. The Frequency Domain Decomposition (FDD) method is used to determine the vibration modes of the building in three dimensions (3D). First three vibration modes with close frequencies and unusual mode shapes were identified, which shows the relevance of the used method in the case of buildings having complex behaviour. Second, the relevance of the applied approach was checked by using 3D Finite Element (FE) modelling, in both cases: <em>fixed-base structure</em> and <em>soil</em> + <em>structure system</em>.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 38-48"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.07.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85918388","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
Structural monitoring using fiber optic sensors of a pre-stressed concrete viaduct during construction phases 预应力混凝土高架桥施工阶段光纤传感器结构监测
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.06.002
Giuseppina Uva , Francesco Porco , Andrea Fiore , Giacinto Porco
{"title":"Structural monitoring using fiber optic sensors of a pre-stressed concrete viaduct during construction phases","authors":"Giuseppina Uva ,&nbsp;Francesco Porco ,&nbsp;Andrea Fiore ,&nbsp;Giacinto Porco","doi":"10.1016/j.csndt.2014.06.002","DOIUrl":"10.1016/j.csndt.2014.06.002","url":null,"abstract":"<div><p>The paper presents a study about the monitoring of a pre-stressed reinforced concrete viaduct in Bari (Italy), by means of an optical fiber system embedded into the structural elements. The application case had two objectives: controlling the structural efficiency during the phases of construction, and allowing, in the future, the periodical check of the structural performance under service loads. Sensors were directly anchored to the prestressing strands during the manufacturing phases of the precast beams. By processing and analyzing the data acquired by the system during the different construction phases, it was possible to assess the strain variations related to load increments and stress losses, by comparing them with expected theoretical values. The specific case study shows that the availability of real-time monitoring procedures is nowadays a precious tool for checking the structural safety of critical facilities, in particular bridges.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 27-37"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.06.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75834543","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: 37
Wire failure prediction for a rotary beam fatigue tester 旋转梁疲劳试验机钢丝失效预测
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-10-01 DOI: 10.1016/j.csndt.2014.04.001
Elizabeth Thompson , Rahul Basu , Timothy Loos
{"title":"Wire failure prediction for a rotary beam fatigue tester","authors":"Elizabeth Thompson ,&nbsp;Rahul Basu ,&nbsp;Timothy Loos","doi":"10.1016/j.csndt.2014.04.001","DOIUrl":"10.1016/j.csndt.2014.04.001","url":null,"abstract":"<div><h3>Objective</h3><p>This work investigates methods for predicting imminent wire failure during fatigue testing.</p></div><div><h3>Methods</h3><p>Sensors that measure changes in vibration, displacement, and infrared signatures were explored, and in-situ video recording was studied for its ability to capture changes in the shape of the wire.</p></div><div><h3>Results</h3><p>Video recording appears to be the most promising of the methods investigated.</p></div><div><h3>Conclusion</h3><p>It has promise for both single and multi-strand configurations.</p></div><div><h3>Practice</h3><p>Further investigations could include image/video processing.</p></div><div><h3>Implications</h3><p>Could be used to determine if the number of fatigue cycles to complete fracture is an accurate measure of the fatigue life of multi-stranded wire.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"2 ","pages":"Pages 1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.04.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83936009","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: 3
Nondestructive evaluation of material degradation and sub-millimeter sized defect detection in steel using magnetic measurements 材料退化的无损评价和亚毫米级钢的磁检测缺陷
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-04-01 DOI: 10.1016/j.csndt.2014.01.001
H. Kikuchi , I. Shimizu , K. Sato , K. Iwata
{"title":"Nondestructive evaluation of material degradation and sub-millimeter sized defect detection in steel using magnetic measurements","authors":"H. Kikuchi ,&nbsp;I. Shimizu ,&nbsp;K. Sato ,&nbsp;K. Iwata","doi":"10.1016/j.csndt.2014.01.001","DOIUrl":"10.1016/j.csndt.2014.01.001","url":null,"abstract":"<div><p>This paper investigates the possibility of simultaneous nondestructive evaluation of material degradation and detection of sub-millimeter sized defects using magnetic methods. We confirmed by FEM simulation that assessment of both degradation and small defects in steel is possible using a single-yoke probe. This was also verified experimentally. The hysteresis loop measurements were sensitive to degradation in the material, and the scanning flux distribution could be effectively used for detecting sub-millimeter sized defects. The degradation and small defects can also be evaluated separately with this single measurement configuration.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"1 ","pages":"Pages 25-31"},"PeriodicalIF":0.0,"publicationDate":"2014-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.01.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79825172","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: 8
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