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Academic literature on the topic 'NDE test'

Author: Grafiati

Published: 1 April 2023

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Journal articles on the topic "NDE test"

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Kondziella, Daniel, Markus Harboe Olsen, Coline L. Lemale, and Jens P. Dreier. "Migraine aura, a predictor of near-death experiences in a crowdsourced study." PeerJ 7 (December 4, 2019): e8202. http://dx.doi.org/10.7717/peerj.8202.

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Background Near-death experiences (NDE) occur with imminent death and in situations of stress and danger but are poorly understood. Evidence suggests that NDE are associated with rapid eye movement (REM) sleep intrusion, a feature of narcolepsy. Previous studies further found REM abnormalities and an increased frequency of dream-enacting behavior in migraine patients, as well as an association between migraine with aura and narcolepsy. We therefore investigated if NDE are more common in people with migraine aura. Methods We recruited 1,037 laypeople from 35 countries and five continents, without any filters except for English language and age ≥18 years, via a crowdsourcing platform. Reports were validated using the Greyson NDE Scale. Results Eighty-one of 1,037 participants had NDE (7.8%; CI [6.3–9.7%]). There were no significant associations between NDE and age (p > 0.6, t-test independent samples) or gender (p > 0.9, Chi-square test). The only significant association was between NDE and migraine aura: 48 (6.1%) of 783 subjects without migraine aura and 33 (13.0%) of 254 subjects with migraine aura had NDE (p < 0.001, odds ratio (OR) = 2.29). In multiple logistic regression analysis, migraine aura remained significant after adjustment for age (p < 0.001, OR = 2.31), gender (p < 0.001, OR = 2.33), or both (p < 0.001, OR = 2.33). Conclusions In our sample, migraine aura was a predictor of NDE. This indirectly supports the association between NDE and REM intrusion and might have implications for the understanding of NDE, because a variant of spreading depolarization (SD), terminal SD, occurs in humans at the end of life, while a short-lasting variant of SD is considered the pathophysiological correlate of migraine aura.

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Clark, Alfred V. "An NDE formability test for sheet metal." JOM 42, no. 7 (1990): 48. http://dx.doi.org/10.1007/bf03221024.

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Skafidas, Panagiotis. "Non-Destructive Testing of Mechanical Properties of Magnetic Materials Using Barkhausen Noise and B-H Loop Techniques." Key Engineering Materials 495 (November 2011): 272–75. http://dx.doi.org/10.4028/www.scientific.net/kem.495.272.

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A magnetic-based nondestructive evaluation (NDE) method, which employs Barkhausen effect and measurement of hysteresis loops, is developed and used to correlate the magnetic and mechanical properties. The NDE test equipment offers the capability to detect small deviations from linearity that occur in the stress-strain curve.

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Hotta, Naoshi, Takahiro Tadokoro, John Henry, et al. "Monitoring of Post-Brain Injuries By Measuring Plasma Levels of Neuron-Derived Extracellular Vesicles." Biomarker Insights 17 (January 2022): 117727192211281. http://dx.doi.org/10.1177/11772719221128145.

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Background: Extracellular vesicles (EV) released from neurons into the blood can reflect the state of nervous tissue. Measurement of neuron derived EV (NDE) may serve as an indicator of brain injury. Methods: A sandwich immunoassay was established to measure plasma NDE using anti-neuron CD171 and anti-EV CD9 ([CD171 + CD9+]). Plasma samples were obtained from commercial sources, cross-country (n = 9), football (n = 22), soccer (n = 19), and rugby (n = 18) athletes over time. Plasma was also collected from patients undergoing total aortic arch replacement (TAR) with selective cerebral perfusion during cardiopulmonary bypass before and after surgery (n = 36). Results: The specificity, linearity, and reproducibility of NDE assay (measurement of [CD171 + CD9+]) were confirmed. By scanning electron microscopy and nanoparticle tracking, spherical vesicles ranging in size from 150 to 300 nm were confirmed. Plasma levels of NDE were widely spread over 2 to 3 logs in different individuals with a significant age-dependent decrease. However, NDE were very stable in each individual within a ± 50% change over time (cross-country, football, soccer), whereas rugby players were more variable over 4 years. In patients undergoing TAR, NDE increased rapidly in days post-surgery and were significantly ( P = .0004) higher in those developing postoperative delirium (POD) (n = 13) than non-delirium patients (n = 23). Conclusions: The blood test to determine plasma levels of NDE was established by a sandwich immunoassay using 2 antibodies against neuron (CD171) and exosomes (CD9). NDE levels varied widely in different individuals and decreased with age, indicating that NDE levels should be considered as a normalizer of NDE biomarker studies. However, NDE levels were stable over time in each individual, and increased rapidly after TAR with greater increases associated with patients developing POD. This assay may serve as a surrogate for evaluating and monitoring brain injuries.

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Hesse, Alex A., Rebecca A. Atadero, and Mehmet E. Ozbek. "Using Expert Opinion to Quantify Uncertainty in and Cost of Using Nondestructive Evaluation on Bridges." Advances in Civil Engineering 2017 (2017): 1–12. http://dx.doi.org/10.1155/2017/7925193.

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A previous literature review indicated that there is little published experimental data that can be used to determine quantities such as bias, accuracy, reliability, and cost of common Nondestructive Evaluation (NDE) methods as far as their use on bridges is concerned. This study attempts to quantify these parameters for common bridge NDE methods through a four-round Delphi method survey with experts in the NDE bridge field. The survey results indicate that most commonly used bridge NDE methods tend to be underbiased and relatively reliable. Furthermore, the accuracy of commonly used bridge NDE methods tends to be relatively variable with the average test measuring a true response between 80% and 85% of the time. In general, it was shown by the participant responses that the more expensive the method was, the better the bias, accuracy, and reliability the method had, and vice versa. The information presented in this paper can serve as a starting point for characterizing different NDE methods for use in bridge management and inspection planning and identifies the type of information that is still needed. As such, this research has the potential to promote further research on this subject.

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Dong, Jun Hua, Shan Na Xu, Wei Ke, and Nan Chen. "The Effect of Cd Addition on NDE of As-Cast Mg-Cd Alloy in 0.1M NaCl Solution." Materials Science Forum 654-656 (June 2010): 779–82. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.779.

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The effect of Cd additions on NDE of an as-cast Mg-Cd alloy in 0.1M NaCl solution was investigated using the gas collection method, potentiostatic current decay test and in-situ Laser Raman Spectroscopy. The experimental results showed that, in the cathodic region the addition of Cd reduced the hydrogen evolution and the magnesium hydride formation; in the anodic region the addition of Cd restrained the NDE but slightly increased the anodic dissolution.

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Albakri, Mohammad I., Logan D. Sturm, Christopher B. Williams, and Pablo A. Tarazaga. "Impedance-based non-destructive evaluation of additively manufactured parts." Rapid Prototyping Journal 23, no. 3 (2017): 589–601. http://dx.doi.org/10.1108/rpj-03-2016-0046.

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Purpose This work proposes the utilization of electromechanical impedance measurements as a means of non-destructive evaluation (NDE) for additive manufacturing (AM). The effectiveness and sensitivity of the technique for a variety of defect types commonly encountered in AM are investigated. Design/methodology/approach To evaluate the feasibility of impedance-based NDE for AM, the authors first designed and fabricated a suite of test specimens with build errors typical of AM processes, including dimensional inaccuracies, positional inaccuracies and internal porosity. Two polymer AM processes were investigated in this work: material jetting and extrusion. An impedance-based analysis was then conducted on all parts and utilized, in a supervised learning context, for identifying defective parts. Findings The newly proposed impedance-based NDE technique has been proven to be an effective solution for detecting several types of print defects. Specifically, it was shown that the technique is capable of detecting print defects resulting in mass change (as small as 1 per cent) and in feature displacement (as small as 1 mm) in both extruded nylon parts and jetted VeroWhitePlus parts. Internal porosity defects were also found to be detectable; however, the impact of this defect type on the measured impedance was not as profound as that of dimensional and positional inaccuracies. Originality/value Compared to currently available NDE techniques, the newly proposed impedance-based NDE is a functional-based technique with the advantages of being cost-effective, sensitive and suitable for inspecting AM parts of complex geometry and deeply embedded flaws. This technique has the potential to bridge the existing gaps in current NDE practices, hence paving the road for a wider adoption of AM to produce mission-critical parts.

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Alvarado, Carlos S., and Nancy L. Zingrone. "Factors Related to the Depth of Near-Death Experiences: Testing the “Embellishment over Time” Hypothesis." Imagination, Cognition and Personality 17, no. 4 (1998): 339–44. http://dx.doi.org/10.2190/vyqp-867c-newq-f054.

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In this article we explore the correlation of several variables with the depth of the near-death experience (NDE) as measured by Ring's Weighted Core Experience Index (WCEI). For this purpose we analyzed fifty-one NDE cases presented by Sutherland in tabular form in her book Reborn in the Light [1]. To test for the possibility that older cases are embellished as time goes on we predicted that we would find a positive correlation between the WCEI and the time elapsed between the experience and Sutherland's interview. Other exploratory analyses attempted to relate the WCEI to sex, age at the time of the experience and at the time of the interview, and type of medical crisis during which the experience took place. None of the analyses conducted obtained significant results. There was a non-significant trend for surgical NDE cases to have higher scores in the WCEI than other conditions.

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Jaber, Ali, Sasan Sattarpanah Sattarpanah Karganroudi, Mohammad Saleh Meiabadi, et al. "On Smart Geometric Non-Destructive Evaluation: Inspection Methods, Overview, and Challenges." Materials 15, no. 20 (2022): 7187. http://dx.doi.org/10.3390/ma15207187.

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Inspection methods, also known as non-destructive evaluation (NDE), is a process for inspecting materials, products, and facilities to identify flaws, imperfections, and malfunctions without destruction or changing the integrity of materials, structures, and mechanisms. However, detecting those defects requires test conducting and results inferring, which is highly demanding in terms of analysis, performance, and time. New technologies are therefore needed to increase the efficiency, probability of detection, and interpretability of NDE methods to establish smart inspection. In this context, Artificial intelligence (AI), as a fundamental component of the Industry 4.0, is a well-suited tool to address downsides associated with the current NDE methods for analysis and interpretation of inspection results, where methods integrating AI into their inspection process become automated and are known as smart inspection methods. This article sheds a light on the conventional methods and the smart techniques used in defects detection. Subsequently, a comparison between the two notions is presented. Furthermore, it investigates opportunities for the integration of non-destructive evaluation (NDE) methods and Industry 4.0 technologies. In addition, the challenges hindering the progress of the domain are mentioned as the potential solutions. To this end, along with Industry 4.0 technologies, a virtual inspection system has been proposed to deploy smart inspection.

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Wilcox, Paul D., Anthony J. Croxford, Nicolas Budyn, et al. "Fusion of multi-view ultrasonic data for increased detection performance in non-destructive evaluation." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 476, no. 2243 (2020): 20200086. http://dx.doi.org/10.1098/rspa.2020.0086.

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State-of-the-art ultrasonic non-destructive evaluation (NDE) uses an array to rapidly generate multiple, information-rich views at each test position on a safety-critical component. However, the information for detecting potential defects is dispersed across views, and a typical inspection may involve thousands of test positions. Interpretation requires painstaking analysis by a skilled operator. In this paper, various methods for fusing multi-view data are developed. Compared with any one single view, all methods are shown to yield significant performance gains, which may be related to the general and edge cases for NDE. In the general case, a defect is clearly detectable in at least one individual view, but the view(s) depends on the defect location and orientation. Here, the performance gain from data fusion is mainly the result of the selective use of information from the most appropriate view(s) and fusion provides a means to substantially reduce operator burden. The edge cases are defects that cannot be reliably detected in any one individual view without false alarms. Here, certain fusion methods are shown to enable detection with reduced false alarms. In this context, fusion allows NDE capability to be extended with potential implications for the design and operation of engineering assets.

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Dissertations / Theses on the topic "NDE test"

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Titus, Michael D. "Development of Induced Magnetic Field Procedure for Nondestructive Evaluation of Deteriorated Prestressing Strand." University of Toledo / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1302289201.

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Brenner, Alina-Alexandra. "Automated NDT robotic system for inspection of test objects with unknown geometry." Thesis, London South Bank University, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.478907.

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Silva, Gabriela Pagano de Oliveira Gonçalves da. "Estudo comparativo entre teste rápido imunológico (LID-NDO) e PCR tempo real de raspado dérmico em álcool e em papel-filtro na hanseníase." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/17/17138/tde-17042018-135821/.

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A hanseníase é uma doença infecciosa que acomete pele e nervos periféricos. Seu diagnóstico é baseado eminentemente nos seus aspectos clínicos variáveis e poucos são os exames complementares que auxiliam no diagnóstico, como baciloscopia do raspado intradérmico, histopatologia, ELISA anti- PGL1 (APGL1) e anti-LID, geralmente positivos nas formas multibacilares, dificultando o diagnóstico das formas paucibacilares. Busca-se comparar os resultados obtidos com o teste rápido imunológico (LID-NDO) Orange Life® com os resultados da PCR tempo real realizada nas amostras de raspado intradérmico e os resultados do ELISA APGL1 coletadas durante a ação por demanda espontânea (Hanseníase Brasília 2014), além de comparar eficiência entre dois métodos diferentes de conservação destas amostras (papel-filtro x álcool). Foram coletadas 277 amostras de raspado dérmico de 50 pacientes clinicamente diagnosticados com hanseníase durante a ação. Na mesma ocasião, os indivíduos diagnosticados foram submetidos à coleta de sangue periférico para teste rápido sorológico (Orange Life®) e ELISA APGL1. A extração de DNA do raspado intradérmico, armazenado no álcool e no papel-filtro, foi realizada no Laboratório de Dermatologia do HC-FMRP-USP. A PCR em tempo real foi realizada usando par de primers específicos RLEP, e o master mix sybr greenPromega. Dos 50 pacientes diagnosticados clinicamente, 90% são multibacilares. Todos os testes, tanto o teste rápido sorológico como a PCR, apresentaram maior positividade nos pacientes multibacilares. O teste rápido sorológico foi positivo em 64,44% dos pacientes multibacilares e em 40% dos paucibacilares. A PCR nas amostras armazenadas no álcool foi positiva em 19,05% dos pacientes multibacilares e a PCR do papel-filtro em 17,78%; nenhuma PCR foi positiva em pacientes paucibacilares. O ELISA APGL foi positivo em 56% dos pacientes diagnosticados. Na PCR das amostras armazenadas no papel-filtro, o sítio de coleta com maior positividade foram os cotovelos (75%). A concordância entre o teste rápido sorológico e a PCR e a concordância entre o teste rápido e o ELISA APGL1 foram fair (suave). Já a concordância entre a PCR das amostras armazenadas no álcool e a PCR das amostras armazenadas no papel-filtro foi perfeita. Concluímos que o exame clínico é ainda essencial para o diagnóstico da hanseníase, principalmente das formas paucibacilares. Os métodos de armazenamento do material coletado por raspado intradérmico (papel-filtro x álcool) não interferiram no resultado final da PCR, portanto o armazenamento no papel-filtro pode ser feito preferencialmente, pois apresenta menor custo para a extração de DNA. O teste rápido sorológico e o ELISA anti-PGL1 têm baixa especificidade, porém podem ter outras aplicações, diferentes do diagnóstico da hanseníase.<br>Leprosy is an infectious disease that affects skin and peripheral nerves. Leprosy diagnosis is mainly based on its variable clinical aspects and few complementary tests that aid in the diagnosis, such as bacilloscopy, histopathology, besides the antiPGL1 ELISA (APGL1) and anti-LID, all of which are generally positive in multibacillary forms, confirming the difficulty in diagnosis of paucibacillary patients. The aim of this study was to compare the results obtained with the Orange Life® Immunological Rapid Test (LID-NDO) with the real-time PCR results obtained in the intradermal scraping samples and the results of the ELISA APGL1, collected during the \"Hanseníase\" action in Brasília in January 2014, in addition to comparing efficiency between two different methods of preservation of these samples (filter paper x alcohol). A total of 277 dermal smear samples were collected from 50 patients clinically diagnosed with leprosy during the procedure. At the same time, the individuals diagnosed were submitted to peripheral blood collection for serological rapid test (Orange Life®) and ELISA APGL1. The extraction of DNA from intradermal scrapings, stored in alcohol and filter paper, was carried out at the Dermatology Laboratory of HC-FMRP-USP. Real-time PCR was performed using a pair of primers specific for the RLEP gene, and the master sybr green-Promega. From 50 patients diagnosed clinically, 90% are multibacillary. All tests, both the serological rapid test and the PCR, were more positive in multibacillary patients. The rapid serological test was positive in 64.44% of the multibacillary patients, and in 40% of the paucibacillary. The PCR in the samples stored in the alcohol was positive in 19.05% of the multibacillary patients and the PCR of the filter paper in 17.78%; PCR weren\'t positive in paucibacillary patients. ELISA APGL was positive in 56% (28) of the diagnosed patients. In the PCR of the samples stored in the filter paper, the collection site with the highest positivity was the elbows (75%). The agreement between the rapid serological test and the PCR and the agreement between the rapid test and the ELISA APGL1 were fair. The agreement between the PCR of the samples stored in the alcohol and the PCR of the samples stored on the filter paper was perfect. We conclude that the clinical examination is still essential for the diagnosis of leprosy, especially in paucibacillary forms. We also concluded that the methods of storing the material collected by intradermal scraping (filter paper x alcohol) do not interfere in the final result of the PCR, therefore the storage in the filter paper can be done preferentially because it presents a lower cost for the extraction of DNA. Rapid serological test and the anti-PGL1 ELISA have low specificity, but may have other different applications than the diagnosis of leprosy.

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Kozáček, Vojtěch. "Experimentální stanovení závislosti parametrů NDT a pevnosti v tlaku betonu." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2020. http://www.nusl.cz/ntk/nusl-409957.

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The diploma thesis deals with non-destructive testing of concrete as well as with the relationship between determined parameters and the compressive strength of concrete. The thesis is mainly focused on the ultrasonic pulse velocity method and the rebound hammer test. The experimental part of the thesis describes non-destructive tests performed on concrete blocks. The compressive strength was tested on the drill cores taken from the concrete blocks. The aim of this thesis is to find regression models of the relationship between the compressive strength and non-destructive parameters, and the subsequent analysis of the results.

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Gunes, E. evren. "Computerized Test Procedure For Industrial Radiographic Examination Of Metallic Welded Joints." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605553/index.pdf.

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Radiography is an extensively used NDT method, especially in nuclear, aerospace and automotive industries where optimal designs call for greater reliability. The rules corresponding to industrial radiography are defined in a system of radiographic standards. The standards related to the radiographic testing of metallic welded joints had been harmonised in all over the Europe and at the end in 1997, the standard &quot<br>EN 1435&quot<br>was established and published. Since then, this standard has become the most widely used standard where the radiographic applications are necessary. To eliminate the person based errors during application of the standard, moreover to save time, cost and effort in radiographic exposures, in this study it was aimed to write a computer program which is able to calculate all necessary parameters for a radiographic exposure related to this standard EN 1435. In the programming stage, Visual Basic 6.0 &amp<br>#61651<br>was used. The program consists of many windows, each giving and controlling separate parameters related to the exposure. Besides giving all the needed parameters, the evolved program is able to prepare a report with these parameters. So, both radiography technicians and experts can use it. It is believed that this study constructs a basis for developing other computerised test procedures for any kind of non-destructive testing methods used in industry today.

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Darrell, Leopold Augustus. "Development of an NDT method to characterise flaws based on multiple eddy current sensor integration and data fusion." Thesis, Leeds Beckett University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.245778.

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Peters, J. A. "The physiology and pharmacology of 5-hydroxytryptamine responses of murine N1E-115 neurobalstoma cells." Thesis, University of Nottingham, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.373319.

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Eiras, Fernández Jesús Nuño. "Studies on nonlinear mechanical wave behavior to characterize cement based materials and its durability." Doctoral thesis, Universitat Politècnica de València, 2016. http://hdl.handle.net/10251/71439.

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[EN] The test for determining the resonance frequencies has traditionally been used to investigate the mechanical integrity of concrete cores, to assess the conformity of concrete constituents in different accelerated durability tests, and to ascertain constitutive properties such as the elastic modulus and the damping factor. This nondestructive technique has been quite appealed for evaluation of mechanical properties in all kinds of durability tests. The damage evolution is commonly assessed from the reduction of dynamic modulus which is produced as a result of any cracking process. However, the mechanical behavior of concrete is intrinsically nonlinear and hysteretic. As a result of a hysteretic stress-strain behavior, the elastic modulus is a function of the strain. In dynamic tests, the nonlinearity of the material is manifested by a decrease of the resonance frequencies, which is inversely proportional to the excitation amplitude. This phenomenon is commonly referred as fast dynamic effect. Once the dynamic excitation ceases, the material undergoes a relaxation process whereby the elastic modulus is restored to that at rest. This phenomenon is termed as slow dynamics. These phenomena (fast and slow dynamics) find their origin in the internal friction of the material. Therefore, in cement-based materials, the presence of microcracks and interfaces between its constituents plays an important role in the material nonlinearity. In the context of the assessment of concrete durability, the damage evolution is based on the increase of hysteresis, as a result of any cracking process. In this thesis three different nondestructive techniques are investigated, which use impacts for exciting the resonant frequencies. The first technique consists in determining the resonance frequencies over a range of impact forces. The technique is termed Nonlinear Impact Resonant Acoustic Spectroscopy (NIRAS). It consists in ascertaining the downward resonant frequency shift that the material undergoes upon increasing excitation amplitude. The second technique consists in investigating the nonlinear behavior by analyzing the signal corresponding to a single impact. This is, to determine the instantaneous frequency, amplitude and attenuation variations corresponding to a single impact event. This technique is termed as Nonlinear Resonant Acoustic Single Impact Spectroscopy (NSIRAS). Two techniques are proposed to extract the nonlinear behavior by analyzing the instantaneous frequency variations and attenuation over the signal ring down. The first technique consists in discretizing the frequency variation with time through a Short-Time Fourier Transform (STFT) based analysis. The second technique consists of a least-squares fit of the vibration signals to a model that considers the frequency and attenuation variations over time. The third technique used in this thesis can be used for on-site evaluation of structures. The technique is based on the Dynamic Acousto- Elastic Test (DAET). The variations of elastic modulus as derived through NIRAS and NSIRAS techniques provide an average behavior and do not allow derivation of the elastic modulus variations over one vibration cycle. Currently, DAET technique is the only one capable to investigate the entire range of nonlinear phenomena in the material. Moreover, unlike other DAET approaches, this study uses a continuous wave source as probe. The use of a continuous wave allows investigation of the relative variations of the elastic modulus, as produced by an impact. Moreover, the experimental configuration allows one-sided inspection.<br>[ES] El ensayo de determinación de las frecuencias de resonancia ha sido tradicionalmente empleado para determinar la integridad mecánica de testigos de hormigón, en la evaluación de la conformidad de mezclas de hormigón en diversos ensayos de durabilidad, y en la terminación de propiedades constitutivas como son el módulo elástico y el factor de amortiguamiento. Esta técnica no destructiva ha sido ampliamente apelada para la evaluación de las propiedades mecánicas en todo tipo de ensayos de durabilidad. La evolución del daño es comúnmente evaluada a partir de la reducción del módulo dinámico, producido como resultado de cualquier proceso de fisuración. Sin embargo, el comportamiento mecánico del hormigón es intrínsecamente no lineal y presenta histéresis. Como resultado de un comportamiento tensión-deformación con histéresis, el módulo elástico depende de la deformación. En ensayos dinámicos, la no linealidad del material se manifiesta por una disminución de las frecuencias de resonancia, la cual es inversamente proporcional a la amplitud de excitación. Este fenómeno es normalmente denominado como dinámica rápida. Una vez la excitación cesa, el material experimenta un proceso de relajación por el cual, el módulo elástico es restaurado a aquel en situación de reposo. Este fenómeno es denominado como dinámica lenta. Estos fenómenos ¿dinámicas rápida y lenta¿ encuentran su origen en la fricción interna del material. Por tanto, en materiales basados en cemento, la presencia de microfisuras y las interfaces entre sus constituyentes juegan un rol importante en la no linealidad mecánica del material. En el contexto de evaluación de la durabilidad del hormigón, la evolución del daño está basada en el incremento de histéresis, como resultado de cualquier proceso de fisuración. En esta tesis se investigan tres técnicas diferentes las cuales utilizan el impacto como medio de excitación de las frecuencias de resonancia. La primera técnica consiste en determinar las frecuencias de resonancia a diferentes energías de impacto. La técnica es denominada en inglés: Nonlinear Impact Resonant Acoustic Spectroscopy (NIRAS). Ésta consiste en relacionar el detrimento que el material experimenta en sus frecuencias de resonancia, con el aumento de la amplitud de la excitación. La segunda técnica consiste en investigar el comportamiento no lineal mediante el análisis de la señal correspondiente a un solo impacto. Ésta consiste en determinar las propiedades instantáneas de frecuencia, atenuación y amplitud. Esta técnica se denomina, en inglés, Nonlinear Single Impact Resonant Acoustic Spectroscopy (NSIRAS). Se proponen dos técnicas de extracción del comportamiento no lineal mediante el análisis de las variaciones instantáneas de frecuencia y atenuación. La primera técnica consiste en la discretización de la variación de la frecuencia con el tiempo, mediante un análisis basado en Short-Time Fourier Transform (STFT). La segunda técnica consiste en un ajuste por mínimos cuadrados de las señales de vibración a un modelo que considera las variaciones de frecuencia y atenuación con el tiempo. La tercera técnica empleada en esta tesis puede ser empleada para la evaluación de estructuras in situ. La técnica se trata de un ensayo acusto-elástico en régimen dinámico. En inglés Dynamic Acousto-Elastic Test (DAET). Las variaciones del módulo elástico obtenidas mediante los métodos NIRAS y NSIRAS proporcionan un comportamiento promedio y no permiten derivar las variaciones del módulo elástico en un solo ciclo de vibración. Actualmente, la técnica DAET es la única que permite investigar todo el rango de fenómenos no lineales en el material. Por otra parte, a diferencia de otras técnicas DAET, en este estudio se emplea como contraste una onda continua. El uso de una onda continua permite investigar las variaciones relativas del módulo elástico, para una señal transito<br>[CAT] L'assaig de determinació de les freqüències de ressonància ha sigut tradicionalment empleat per a determinar la integritat mecànica de testimonis de formigó, en l'avaluació de la conformitat de mescles de formigó en diversos assajos de durabilitat, i en la terminació de propietats constitutives com són el mòdul elàstic i el factor d'amortiment. Esta tècnica no destructiva ha sigut àmpliament apel·lada per a l'avaluació de les propietats mecàniques en tot tipus d'assajos de durabilitat. L'evolució del dany és comunament avaluada a partir de la reducció del mòdul dinàmic, produït com resultat de qualsevol procés de fisuración. No obstant això, el comportament mecànic del formigó és intrínsecament no lineal i presenta histèresi. Com resultat d'un comportament tensió-deformació amb histèresi, el mòdul elàstic depén de la deformació. En assajos dinàmics, la no linealitat del material es manifesta per una disminució de les freqüències de ressonància, la qual és inversament proporcional a l'amplitud d'excitació. Este fenomen és normalment denominat com a dinàmica ràpida. Una vegada l'excitació cessa, el material experimenta un procés de relaxació pel qual, el mòdul elàstic és restaurat a aquell en situació de repòs. Este fenomen és denominat com a dinàmica lenta. Estos fenòmens --dinámicas ràpida i lenta troben el seu origen en la fricció interna del material. Per tant, en materials basats en ciment, la presència de microfissures i les interfícies entre els seus constituents juguen un rol important en la no linealitat mecànica del material. En el context d'avaluació de la durabilitat del formigó, l'evolució del dany està basada en l'increment d'histèresi, com resultat de qualsevol procés de fisuración. En esta tesi s'investiguen tres tècniques diferents les quals utilitzen l'impacte com a mitjà d'excitació de les freqüències de ressonància. La primera tècnica consistix a determinar les freqüències de ressonància a diferents energies d'impacte. La tècnica és denominada en anglés: Nonlinear Impact Resonant Acoustic Spectroscopy (NIRAS). Esta consistix a relacionar el detriment que el material experimenta en les seues freqüències de ressonància, amb l'augment de l'amplitud de l'excitació. La segona tècnica consistix a investigar el comportament no lineal per mitjà de l'anàlisi del senyal corresponent a un sol impacte. Esta consistix a determinar les propietats instantànies de freqüència, atenuació i amplitud. Esta tècnica es denomina, en anglés, Nonlinear Single Impact Resonant Acoustic Spectroscopy (NSIRAS). Es proposen dos tècniques d'extracció del comportament no lineal per mitjà de l'anàlisi de les variacions instantànies de freqüència i atenuació. La primera tècnica consistix en la discretización de la variació de la freqüència amb el temps, per mitjà d'una anàlisi basat en Short-Time Fourier Transform (STFT). La segona tècnica consistix en un ajust per mínims quadrats dels senyals de vibració a un model que considera les variacions de freqüència i atenuació amb el temps. La tercera tècnica empleada en esta tesi pot ser empleada per a l'avaluació d'estructures in situ. La tècnica es tracta d'un assaig acusto-elástico en règim dinàmic. En anglés Dynamic Acousto-Elastic Test (DAET). Les variacions del mòdul elàstic obtingudes per mitjà dels mètodes NIRAS i NSIRAS proporcionen un comportament mitjà i no permeten derivar les variacions del mòdul elàstic en un sol cicle de vibració. Actualment, la tècnica DAET és l'única que permet investigar tot el rang de fenòmens no lineals en el material. D'altra banda, a diferència d'altres tècniques DAET, en este estudi s'empra com contrast una ona contínua. L'ús d'una ona contínua permet investigar les variacions relatives del mòdul elàstic, per a un senyal transitori. A més, permet la inspecció d'elements per mitjà de l'accés per una sola cara.<br>Eiras Fernández, JN. (2016). Studies on nonlinear mechanical wave behavior to characterize cement based materials and its durability [Tesis doctoral no publicada]. Universitat Politècnica de València. https://doi.org/10.4995/Thesis/10251/71439<br>TESIS<br>Premiado

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Fabri, Angélica da Conceição Oliveira Coelho. "Análise comparativa da reatividade anti-LID-1, NDO-LID, NDO-HSA e PGL-1 em hanseníase." Universidade Federal de Minas Gerais (UFMG), 2015. https://repositorio.ufjf.br/jspui/handle/ufjf/7027.

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Submitted by Renata Lopes (renatasil82@gmail.com) on 2018-08-21T12:03:55Z No. of bitstreams: 1 angelicadaconceicaooliveiracoelho.pdf: 3773705 bytes, checksum: e753f755e09e6a5c7102c48ac076e08f (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-08-21T14:22:17Z (GMT) No. of bitstreams: 1 angelicadaconceicaooliveiracoelho.pdf: 3773705 bytes, checksum: e753f755e09e6a5c7102c48ac076e08f (MD5)<br>Made available in DSpace on 2018-08-21T14:22:17Z (GMT). No. of bitstreams: 1 angelicadaconceicaooliveiracoelho.pdf: 3773705 bytes, checksum: e753f755e09e6a5c7102c48ac076e08f (MD5) Previous issue date: 2015-08-14<br>PROQUALI (UFJF)<br>A infecção subclínica pode ser avaliada por meio de teste sorológico, que determina imunoglobulinas circulantes. O objetivo do presente estudo foi analisar a reatividade de diferentes antígenos em casos novos de hanseníase, contatos domiciliares de casos e em população de área endêmica, com o intuíto de identificar o melhor antígeno para o diagnóstico sorológico da hanseníase e detecção de indivíduos infectados pelo Mycobacterium leprae. Trata-se de um estudo transversal de natureza exploratória e analítica. A reatividade anti-LID1, NDO-LID, NDO-HSA e PGL-1 foi avaliada por meio do enzyme-linked immunosorbent assay. Foram analisadas amostras de sangue total em papel de filtro Whatman de 2494 indivíduos da população de sete municípios da microrregião de Almenara e de soro de 94 casos novos de hanseníase e 104 contatos domiciliares de casos residentes no município de Uberlândia. O Banco de Dados foi criado no Software Epi Info versão 3.5.1 e análise realizada no software Statistical Package for the Social Sciences for Windows 18 e no GraphPad Prism versão 5. Para análise estatística foram utilizados os seguintes testes: Kolmogorov-Smirnov, Kruskal-Wallis one-way (H), Mann-Whitney (U) com correção de Bonferroni, kappa, Spearman (rho), teste Qui-quadrado de Pearson e regressão logística binária. Foi observado maior soropositividade no grupo de casos multibacilares (MB), em contatos domiciliares de casos MB e nos indivíduos residentes nos municípios de Almenara e Jequitinhonha. Obteve-se correlação positiva entre a sorologia e o índice baciloscópico, concordância substancial e significativa no grupo de casos novos de hanseníase e correlação positiva para todos os antígenos testados. Os testes anti-LID-1 e anti-NDO-LID apresentaram melhor performance para identificar os contatos domiciliares e ou indivíduos da população infectados pelo M. leprae. O PGL-1 nativo teve maior positividade do que o NDO-HSA para todas as formas clínicas da hanseníase e no grupo de contatos domiciliares. A prevalência de soropositividade na população foi superior à taxa de detecção de casos de hanseníase em todos os municípios avaliados. A faixa etária, a renda familiar, residir em município endêmico, conhecer alguém que teve ou tem hanseníase, ter ou ter tido caso de hanseníase na familia e residir ou ter residido com caso de hanseníase são fatores que podem explicar a diferença de soropositividade anti-NDO-LID. Apenas a faixa etária e conhecer alguém que teve ou tem hanseníase é capaz de explicar a diferença de soropositividade anti-NDO-HSA. E em relação ao LID-1 nenhuma variável foi explicativa. Todos os antígenos analisados podem auxiliar na diferenciação e caracterização da hanseníase MB e na identificação de indivíduos expostos ao M. leprae, porém o NDO-LID apresentou melhor performance na identificação desses indivíduos e dos casos paucibacilares, quando comparado aos testes envolvendo os antígenos LID-1 e NDO-HSA separadamente, portanto fornece benefício adicional a esses antígenos e poderia ser utilizado como ferramenta auxiliar na vigilância epidemiológica da hanseníase.<br>The subclinical infection can be evaluated by serologic test which determine circulating immunoglobulins. The aim of this study was to analyze the reactivity of different antigens in leprosy cases, household contacts of index cases and the population of the endemic area to identify the best antigen for the diagnosis of leprosy and detection of individuals infected with Mycobacterium leprae. It is a cross-sectional study of exploratory and analytical nature. The reactivity anti-LID-1, NDO-LID, NDO-HAS e PGL-1 were evaluated using the enzymelinked immunosorbent assay. The whole blood in Whatman filter paper of 2494 individuals from the general population of seven municipalities in the micro-Almenara and serum of 94 patients with leprosy and 104 household contacts of patients residing in Uberlândia were analyzed. The database was created in Epi Info software version 3.5.1 and analysis in the software Statistical Package for Social Sciences for Windows 18 and GraphPad Prism version 5. For statistical analysis the following tests were used: Kolmogorov-Smirnov, Kruskal Wallis one-way (H), Mann-Whitney (U) with Bonferroni correction, kappa, Spearman (rho), chisquare test of Pearson and binary logistic regression. Identied higher seropositivity in the group of MB patients, household contacts of MB patients and in individuals living in the municipalities of Almenara and Jequitinhonha. Observed positive correlation between serology test and bacterial index, substantial agreement and significant in patients positive and positive correlation for all antigens. The LID-1 and NDO-LID antigens showed greater ability to identify household contacts or the general population infected with M. leprae, but the performance of the NDO-LID was better. The native PGL-1 had higher seropositivity than the NDO-HSA for all clinical forms of leprosy and household contacts. The seropositivity prevalence in the general population was higher than the detection rate of leprosy cases in all evaluated municipalities. The age, family income, living in a city endemic, knowing someone who had or has leprosy, had or have the case in the family and live or lived with leprosy case are factors that can explain the anti-NDO-LID seropositivity difference. Only the age range and know someone who had or has leprosy is able to explain the anti-NDO-HSA seropositivity difference. And for the LID-1 no variable explained the anti-LID-1 seropositivity difference. All serological tests analyzed can assist in the differentiation and characterization of MB leprosy and the identification of individuals exposed to M. leprae, but NDO-LID performed better in identifying these individuals and PB patients, when compared to the tests involving the LID-1 and NDO-HSA antigens separately, therefore provides additional benefit to these antigens and could be used as an auxiliary tool in epidemiological surveillance of leprosy.

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Ahamdi, Hossein. "Concrete Bridge Deck Aging, Inspection and Maintenance." University of Toledo / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1513292224089599.

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Books on the topic "NDE test"

1

Klima, Stanley J. NDE of structural ceramics. National Aeronautics and Space Administration, Lewis Research Center, 1986.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. Impact of emerging NDE-NDI methods on aircraft design, manufacture and maintenance: papers presented at the 69th Meeting of the Structures and Materials Panel in Brussels, Belgium, 1st-6th October 1989. Advisory Group for Aerospace Research & Development, 1990.

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Glossop, N. D. W. Image-enhanced backlighting: a new method of NDE for translucent composites. [s.n.], 1989.

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Walker, James L. Study methods to standardize thermography NDE: Final report : contract number, NAS8-38609. National Aeronautics and Space Administration, 1998.

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L, Workman Gary, and United States. National Aeronautics and Space Administration., eds. Study methods to standardize thermography NDE: Final report : contract number, NAS8-38609. National Aeronautics and Space Administration, 1998.

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F, Tennis Richard, Pickens Keith S, Southwest Research Institute, and United States. National Aeronautics and Space Administration., eds. Ultrasonic phased-array characterization for NDE applications: Final report, project 17-9891. Southwest Research Institute, 1995.

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F, Tennis Richard, Pickens Keith S, Southwest Research Institute, and United States. National Aeronautics and Space Administration., eds. Ultrasonic phased-array characterization for NDE applications: Final report, project 17-9891. Southwest Research Institute, 1995.

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F, Tennis Richard, Pickens Keith S, Southwest Research Institute, and United States. National Aeronautics and Space Administration., eds. Ultrasonic phased-array characterization for NDE applications: Final report, project 17-9891. Southwest Research Institute, 1995.

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North Atlantic Treaty Organization. Advisory Group for Aerospace Research and Development. POD assessment of NDI procedures using a round robin test. AGARD, 1995.

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Advisory Group for Aerospace Research and Development. Structures and Materials Panel., ed. POD assessment of NDI procedures using a round robin test. Agard, 1995.

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Book chapters on the topic "NDE test"

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Heller, Warren G. "Quantitative NDE Using Imagery and Other Known Information about a Test Object." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1990. http://dx.doi.org/10.1007/978-1-4684-5772-8_3.

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Ko, Ray T. "Results of the Phase I Reliability Test on the RFC/NDE Eddy Current Station." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1987. http://dx.doi.org/10.1007/978-1-4613-1893-4_112.

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Singh, Madhusudan. "Wireless Mesh Networks: Real-Time Test-Bed." In Node-to-Node Approaching in Wireless Mesh Connectivity. Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-0674-7_6.

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Vrhel, J., and J. Běhal. "Visual detection reliability of fatigue cracks in aircraft test laboratory." In Emerging Technologies in NDT. CRC Press, 2021. http://dx.doi.org/10.1201/9781003078586-8.

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Pappas, Y. Z., Y. P. Markopoulos, and V. Kostopoulos. "On the use of acoustic emission for damage mode identification in the case of ceramic matrix composites subjected to compact tension test." In Emerging Technologies in NDT. CRC Press, 2021. http://dx.doi.org/10.1201/9781003078586-11.

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Son, Junwon, and Jamshid Mohammadi. "A Review of Non-Destructive Test Methods for Bridges." In NDT Methods Applied to Fatigue Reliability Assessment of Structures. American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/9780784407424.ch08.

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Fahr, A., D. Forsyth, M. Bullock, and W. Wallace. "POD Assessment of NDI Procedures- Results of a Round Robin Test." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1987-4_306.

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Mohammadi, Jamshid. "An Overview of Non-Destructive Test Methods in Fatigue and Fracture Reliability Assessment." In NDT Methods Applied to Fatigue Reliability Assessment of Structures. American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/9780784407424.ch01.

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Braun, Joseph, and Jamshid Mohammadi. "Structural Monitoring as a Non-Destructive Test Method in Fatigue Reliability Assessment of Aging Aircraft." In NDT Methods Applied to Fatigue Reliability Assessment of Structures. American Society of Civil Engineers, 2004. http://dx.doi.org/10.1061/9780784407424.ch02.

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Li, Yi, Dehao Wu, and Yuesheng Zhu. "A Multiple Positives Enhanced NCE Loss for Image-Text Retrieval." In MultiMedia Modeling. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-98358-1_34.

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Conference papers on the topic "NDE test"

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Wang, Wei-Chih, and Reynold R. Panergo. "Design and test of a microfabricated SU-8 optical scanner." In NDE for Health Monitoring and Diagnostics, edited by Tribikram Kundu. SPIE, 2004. http://dx.doi.org/10.1117/12.538349.

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Allen, David W., Hoon Sohn, Keith Worden, and Charles R. Farrar. "Utilizing the sequential probability ratio test for building joint monitoring." In NDE For Health Monitoring and Diagnostics, edited by Andrew L. Gyekenyesi, Steven M. Shepard, Dryver R. Huston, A. Emin Aktan, and Peter J. Shull. SPIE, 2002. http://dx.doi.org/10.1117/12.470707.

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Ellingson, William A., Christopher M. Deemer, Jiangang Sun, and Eugene R. Koehl. "NDE Technology for Ceramic Composites." In ASME Turbo Expo 2006: Power for Land, Sea, and Air. ASMEDC, 2006. http://dx.doi.org/10.1115/gt2006-91349.

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Installation of gas turbine components made of ceramic matrix composite (CMC) materials, which have limited test bed data bases, can put test engines at risk. Further, changes in properties of the materials of these components have been shown to occur with exposure. Risks to the engine can be mitigated through the application of proper nondestructive inspection methods. Further, while still under development, proper application of certain nondestructive evaluation (NDE) technologies seem likely to be able to provide data that can be correlated to retained strength or other properties of these composite materials. If sufficient data were available informed decisions could be made regarding reuse, repair or replace with appropriate NDE. Over the past fourteen years, Argonne National Laboratory (ANL), has been developing various NDE methods specifically for CMC materials. These NDE technologies include: infrared based thermal imaging, air-coupled ultrasonic approaches, high spatial resolution x-ray computed tomography and more recently optical coherence tomography and guided plate waves. This paper will review the developments of these NDE technologies and will provide results with collaboration from engine and laboratory materials tests.

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Klima, Stanley J., and Alex Vary. "NDE of Structural Ceramics." In ASME 1986 International Gas Turbine Conference and Exhibit. American Society of Mechanical Engineers, 1986. http://dx.doi.org/10.1115/86-gt-279.

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Radiographic, ultrasonic, scanning laser acoustic microscopy (SLAM), and thermo-acoustic microscopy techniques were used to characterize silicon nitride and silicon carbide modulus-of-rupture test specimens in various stages of fabrication. Conventional and microfocus x-ray techniques were found capable of detecting minute high density inclusions in as-received powders, green compacts, and fully densified specimens. Significant density gradients in sintered bars were observed by radiography, ultrasonic velocity, and SLAM. Ultrasonic attenuation was found sensitive to microstructural variations due to grain and void morphology and distribution. SLAM was also capable of detecting voids, inclusions, and cracks in finished test bars. Consideration is given to the potential for applying thermo-acoustic microscopy techniques to green and densified ceramics. The detection probability statistics and some limitations of radiography and SLAM also are discussed.

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Muthuswami, L., Y. Zheng, and Robert E. Geer. "Nondestructive nanomechanical imaging: cross-sectional ultrasonic force microscopy of integrated circuit test structures." In NDE for Health Monitoring and Diagnostics, edited by Norbert Meyendorf, George Y. Baaklini, and Bernd Michel. SPIE, 2003. http://dx.doi.org/10.1117/12.483994.

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Ogiyama, Kazuki, and Tadanobu Sato. "Nonlinear structural system identification using shaking table test data of five-story model building." In NDE for Health Monitoring and Diagnostics, edited by Tribikram Kundu. SPIE, 2004. http://dx.doi.org/10.1117/12.541724.

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Waters, Amy, Dave Weirup, Howard Hall, et al. "Radiation detection field test at the Federal Express (FedEx) air cargo facility at Denver International Airport (DIA)." In NDE for Health Monitoring and Diagnostics, edited by Steven R. Doctor, Yoseph Bar-Cohen, A. Emin Aktan, and H. Felix Wu. SPIE, 2004. http://dx.doi.org/10.1117/12.543314.

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Bono, Francesco Morgan, Luca Radicioni, and Simone Cinquemani. "A comparison between regular and physics-informed neural networks based on a numerical multibody model: a test case for the synthesis of mechanisms." In NDE 4.0, Predictive Maintenance, Communication, and Energy Systems: The Digital Transformation of NDE, edited by Norbert G. Meyendorf, Ripi Singh, and Christopher Niezrecki. SPIE, 2023. http://dx.doi.org/10.1117/12.2657981.

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Aktan, A. Emin, Dan M. Frangopol, Hamid Ghasemi, Harry W. Shenton, Masanobu Shinozuka, and Samar Madanat. "A network of field test sites as a platform for research on engineering and management of the highway transportation infrastructure." In NDE for Health Monitoring and Diagnostics, edited by Steven R. Doctor, Yoseph Bar-Cohen, A. Emin Aktan, and H. Felix Wu. SPIE, 2004. http://dx.doi.org/10.1117/12.558444.

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Ayorinde, Emmanuel, Sadikul Islam, Hassan Mahfuz, Ronald Gibson, Feizhong Deng, and Shaikh Jeelani. "Basic NDE of Some Nano Composites." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33472.

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The influence of the nano-sized particulate or slender structures admixed into the material of regular composite structures of various architectures is being enthusiastically studied in many places across the world, but the study is yet in its infancy because there are so many aspects to be investigated. This work is basically on foam-cored structural sandwich composites, and even here there are many variables involved, for example the nano-enhancer can be introduced into the reinforcement, the matrix or the foam. The focus of the work is on some possible effects of the presence of the nano-materials on the NDE process in testing these composites. Acoustic emission is emphasized in these studies, as it appears to hold promise for non-destructively testing materials of this nature, and basic and standard mechanical test methods are employed.

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Reports on the topic "NDE test"

1

Murphy, Mark, Kayte Denslow, Josef Christ, Gregory Carter, and Matthew Taubman. NDE Technology Engineering Program for Hanford DST Non-Visual Volumetric Inspection Technology – Phase II RAVIS Radiation Tolerance Test Report. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1835606.

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Fong, Jeffrey T. Analysis of PVRC 251J sectioning data (1984) and round roibin ultrasonic test data (1968) for estimatimg relaibility of flaw fabrication and NDE procedure. National Bureau of Standards, 1986. http://dx.doi.org/10.6028/nbs.ir.86-3368.

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Needham, D. M., and S. A. Jones. Software Fault Tree Key Node Metric Test Cases. Defense Technical Information Center, 2006. http://dx.doi.org/10.21236/ada460760.

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DeYoung, Anemarie, Vincent Yuan, George Morgan, et al. NDSE Static Series V & VI Test Results. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1660590.

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Ray, Jason, and Clayton Thurmer. 2020 guided wave inspection of California Department of Water Resources tainter gate post-tensioned trunnion anchor rods : Oroville Dam. Engineer Research and Development Center (U.S.), 2022. http://dx.doi.org/10.21079/11681/43762.

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The Engineering and Test Branch within the Division of Operations and Maintenance of the California Department of Water Resources (DWR) and U.S. Army Corps of Engineers (USACE), Sacramento District, tasked the Sensor Integration Branch (SIB) at the Engineer Research and Develop-ment Center (ERDC) to perform non-destructive testing (NDT) on the trunnion anchor rods at Oroville Dam through the use of ultrasonic guided waves. This is the third year of this NDT. The results of the testing are presented along with qualitative analysis in determining whether a rod is in-tact or compromised. Analysis is based upon the expected results from other rods at the site, knowledge of rod response at other sites, data gathered from the trunnion rod research test bed at the ERDC, and comparison to the previous year’s effort.

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Ray, Jason D., and Clayton R. Thurmer. 2021 Guided Wave Inspection of California Department of Water Resources Tainter Gate Post-Tensioned Trunnion Anchor Rods: Oroville Dam. U.S. Army Engineer Research and Development Center, 2022. http://dx.doi.org/10.21079/11681/46282.

Full text

Abstract:

The Engineering and Test Branch within the Division of Operations and Maintenance of the California Department of Water Resources (DWR) and U.S. Army Corps of Engineers (USACE), Sacramento District, tasked the Sensor Integration Branch (SIB) at the Engineer Research and Development Center (ERDC) to perform nondestructive testing (NDT) on the trunnion anchor rods at Oroville Dam through the use of ultrasonic guided waves. This is the fourth year of this NDT. The results of the testing are presented along with qualitative analysis in determining whether a rod is intact or compromised. Analysis is based upon the expected results from other rods at the site, knowledge of rod response at other sites, data gathered from the trunnion rod research test bed at ERDC, and comparison to the previous year’s effort.

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Kilroy, K. C., and C. S. Savard. Geohydrology of Pahute Mesa-3 test well, Nye County, Nevada. Office of Scientific and Technical Information (OSTI), 1997. http://dx.doi.org/10.2172/434440.

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Anderson, Alexander, Subramanian Vadari, Jonathan Barr, et al. Introducing the 9500 Node Distribution Test System to Support Advanced Power Applications. Office of Scientific and Technical Information (OSTI), 2022. http://dx.doi.org/10.2172/1922914.

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Greg Ruskauff. Well ER-6-1 Tracer Test Analysis: Yucca Flat, Nevada Test Site, Nye County, Nevada, Rev. No.: 0. Office of Scientific and Technical Information (OSTI), 2006. http://dx.doi.org/10.2172/892034.

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Stoller-Navarro Joint Venture. Transferability of Data Related to the Underground Test Area Project, Nevada Test Site, Nye County, Nevada: Revision 0. Office of Scientific and Technical Information (OSTI), 2004. http://dx.doi.org/10.2172/825408.

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