Case Studies in Nondestructive Testing and Evaluation最新文献

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Signature frequencies for buried soil anchors 埋地土锚的信号频率
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-04-01 DOI: 10.1016/j.csndt.2014.03.001
James F. Wilson
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引用次数: 0
Study on the subsurface damage depth in machined silicon wafers by the laser-ultrasonic method 激光超声法对加工硅片亚表面损伤深度的研究
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-04-01 DOI: 10.1016/j.csndt.2014.03.002
A.A. Karabutov , N.B. Podymova
{"title":"Study on the subsurface damage depth in machined silicon wafers by the laser-ultrasonic method","authors":"A.A. Karabutov ,&nbsp;N.B. Podymova","doi":"10.1016/j.csndt.2014.03.002","DOIUrl":"10.1016/j.csndt.2014.03.002","url":null,"abstract":"<div><p>This work aims at applying the laser-ultrasonic method for nondestructive evaluation of the depth of the subsurface damage in machined silicon wafers. It is based on different mechanisms of laser excitation of ultrasound by absorption of Q-switched Nd:YAG laser pulses at the fundamental wavelength: the concentration–deformation mechanism in the single-crystalline silicon and the thermoelastic one in the damaged layer. Due to the uniform heating of the whole damaged layer during the laser pulse action the amplitude of the compression phase of the laser-induced ultrasonic signal is proportional to the damaged depth. The rarefaction phase of this signal arises by absorption of the rest of laser energy in the single-crystalline silicon beneath the damaged layer. The empirical relation between the depth of the subsurface damage and the ratio of the amplitudes of compression and rarefaction phases of the laser-induced ultrasonic signal can be fitted by a linear function within the depth variation and the corresponding spread of the signal amplitudes. This relation can be used for in situ quantitative nondestructive evaluation of the depth of the subsurface damage in machined silicon wafers; the minimal reliably detectable depth is estimated at the level of 0.15–0.2 μm.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"1 ","pages":"Pages 7-12"},"PeriodicalIF":0.0,"publicationDate":"2014-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.03.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89188005","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: 7
Monitoring structural deterioration of railway turnout systems via dynamic wheel/rail interaction 通过轮轨动态相互作用监测铁路道岔系统结构劣化
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-04-01 DOI: 10.1016/j.csndt.2014.03.004
Sakdirat Kaewunruen
{"title":"Monitoring structural deterioration of railway turnout systems via dynamic wheel/rail interaction","authors":"Sakdirat Kaewunruen","doi":"10.1016/j.csndt.2014.03.004","DOIUrl":"10.1016/j.csndt.2014.03.004","url":null,"abstract":"<div><p>‘<em>Big data</em>’ obtained from wayside detection systems and sensors installed on board a train show that actual loading history for a railway track is rather dynamic and transient. The dynamic loadings due to train and track interactions redistribute from the rails to the rail pad, from the rail pad to the railway sleeper, and from the railway sleeper to the underlying ground. Dynamic content redistributed onto each layer of track is also filtered by energy dissipation characteristic of materials and structures. As a critical infrastructure, railway turnout is a structural grillage system used to divert a train to other directions or other tracks. The wheel–rail contact over the crossing transfer zone often causes detrimental impact loads that rapidly deteriorate the turnout and its components. The dynamic responses of wheel–rail interaction depend largely on the non-smooth trajectory or wearing condition of crossing geometry. In reality, a railway line spreads over a large distance and monitoring such rail infrastructure is one of the challenges in rail industry. This paper presents a methodology and application to evaluate and monitor the structural deterioration of railway turnout systems in an Australian urban rail network. The method has integrated numerical train/track simulations, axle box acceleration and ride quality data obtained from the calibrated track inspection vehicle “AK Car”.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"1 ","pages":"Pages 19-24"},"PeriodicalIF":0.0,"publicationDate":"2014-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.03.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90912620","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: 98
The inspection of curved components using flexible ultrasonic arrays and shape sensing fibres 利用柔性超声阵列和形状传感纤维对弯曲部件进行检测
Case Studies in Nondestructive Testing and Evaluation Pub Date : 2014-04-01 DOI: 10.1016/j.csndt.2014.03.003
Christopher J.L. Lane
{"title":"The inspection of curved components using flexible ultrasonic arrays and shape sensing fibres","authors":"Christopher J.L. Lane","doi":"10.1016/j.csndt.2014.03.003","DOIUrl":"10.1016/j.csndt.2014.03.003","url":null,"abstract":"<div><p>A novel inspection system which incorporates a low-profile flexible ultrasonic array and a shape sensing fibre is presented in this paper. The system is shown to be able to directly measure the location of the elements in the array as it conforms to a curved surface. This enables the accurate ultrasonic imaging and inspection of components with complex geometries for sub-surface defects. The system offers many significant advantages over other inspection approaches and is particularly applicable to <em>in situ</em> inspections where access is limited.</p></div>","PeriodicalId":100221,"journal":{"name":"Case Studies in Nondestructive Testing and Evaluation","volume":"1 ","pages":"Pages 13-18"},"PeriodicalIF":0.0,"publicationDate":"2014-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.csndt.2014.03.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81634671","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: 39
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