GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Online Resource
    Online Resource
    Non-destructive testing in civil engineering: A memorandum for teaching at German-speaking universities
    NDT.net GmbH & Co. KG ; 2022
    In:  e-Journal of Nondestructive Testing Vol. 27, No. 9 ( 2022-09)
    Details
    In: e-Journal of Nondestructive Testing, NDT.net GmbH & Co. KG, Vol. 27, No. 9 ( 2022-09)
    Abstract: This contribution summarizes actual developments and draft fundamental teaching topics in the field of non-destructive testing in civil engineering (NDTCE). It is based on the first memorandum on teaching and research in the field of NDTCE at Germanspeaking universities and provides an overview of the academic education and highlights possible focuses, especially in regards to teaching but also takes into account noteworthy developments and topics in research in the field of NDTCE. Suggestions are given for the development and advancement of the teaching curricula in regards to a comprehensive and sound professional education of students in civil engineering and adjacent disciplines. In terms of content and form, this contribution is based on the memorandum of university teachers in the sister field of “Building Materials”. Resulting parallels are therefore not by chance but rather intended. The memorandum was developed out of an initiative of the Subcommittee on Education – Workgroup Education in Universities – of the technical committee NDT in Civil Engineering of the German Society for Nondestructive Testing (DGZfP).
    Type of Medium: Online Resource
    ISSN: 1435-4934
    URL: Article
    DOI: 10.58286/27248
    Language: Unknown
    Publisher: NDT.net GmbH & Co. KG
    Publication Date: 2022
    detail.hit.zdb_id: 2021293-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 2
    Online Resource
    Online Resource
    Implementation of a Performance Evaluation System for Nondestructive Testing Methods
    Macrothink Institute, Inc. ; 2016
    In:  Journal of Safety Studies Vol. 2, No. 2 ( 2016-12-11), p. 44-
    Details
    In: Journal of Safety Studies, Macrothink Institute, Inc., Vol. 2, No. 2 ( 2016-12-11), p. 44-
    Abstract: 〈 p 〉 Nondestructive Testing (NDT) is an important means to ensure structural integrity and safe operation of components in many industries, as for example nuclear power plants, aerospace or civil engineering. Within the qualification of Nondestructive Testing personnel as well as validation of NDT procedures, practical demonstrations on test blocks with realistic flaws play a key role. Adequate test pieces need to be designed according to specific criteria such as quantity, shape, orientation, size and position of the test flaws, depending on the requirements of the national codes and standards in the specific industries. The performance of the candidates and inspection systems is quantified and analyzed with respect to criteria, such as detection, positioning, characterization as well as length and height sizing of flaws. Statistic measures are applied to express the resulting accuracy and overall performance. The indication reports obtained from different candidates contain ample information, which might not appear evident at first sight. The complexity of the situation requires an intelligent extraction of the information from the data. An analysis tool 〈 em 〉 IndEva 〈 /em 〉 was developed to handle this complexity and provide an accurate, detailed and reliable evaluation of inspection systems and personnel. Besides the plain evaluation regarding the fulfilment of the qualification requirements, critical test flaws as well as test block sections, which are likely to cause false positive indications can be identified. Statistic results display the dependency of the system performance on various parameters and parameter combinations to provide a clear picture of the performance. Country-specific evaluation standards can be applied and compared, especially with regard to the continuous improvement of the qualification methodology. 〈 /p 〉
    Type of Medium: Online Resource
    ISSN: 2377-3219
    URL: Issue
    URL: Article
    DOI: 10.5296/jss.v2i2
    DOI: 10.5296/jss.v2i2.10439
    Language: Unknown
    Publisher: Macrothink Institute, Inc.
    Publication Date: 2016
    detail.hit.zdb_id: 2855600-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    POD and GUM Universal Methods for Making Safety Measurable
    Macrothink Institute, Inc. ; 2016
    In:  Journal of Safety Studies Vol. 2, No. 2 ( 2016-12-11), p. 56-
    Details
    In: Journal of Safety Studies, Macrothink Institute, Inc., Vol. 2, No. 2 ( 2016-12-11), p. 56-
    Abstract: 〈 p 〉 Various non-destructive testing (NDT) methods such as ultrasounds (UT) or eddy current (ET) have been established for in-service inspections (ISI) or for condition assessment in different kind of industries such as in the nuclear or aerospace business. Another example for a common NDT inspection task is the detection of tendon ducts in the field of civil engineering (CE) using Ground Penetrating Radar (GPR) as well as the determination of its lateral and depth position. Therefore, the detection limits of the used inspection system, which depends on the depth position and the number of tendon ducts and distances between them, has to be well known. One approach to determine the limits of detection is the application of the POD method (probability of detection) as a universal procedure, which excludes the human factor and calculates the a 〈 sub 〉 90/95 〈 /sub 〉 value and other characteristic parameters. With this information, different inspection systems can be compared objectively to choose the most suitable NDT-system for each individual inspection task. To distinguish between a real variation in the tendon duct position and the accuracy of the inspection system, the knowledge about the uncertainty of measurement is required. To determine the accuracy of the selected NDT-system, the GUM procedure (guide to the expression of uncertainty in measurement) has been established and provides a statistical evaluated result in form of the measurement result and its expanded uncertainty. This article introduces a procedure using the example of tendon duct detection (POD) and depth position description (GUM) in concrete with Ground Penetrating Radar (GPR). Finally, the universal application of both methods (POD and GUM) in different fields of industries is illustrated by some examples. 〈 /p 〉
    Type of Medium: Online Resource
    ISSN: 2377-3219
    URL: Issue
    URL: Article
    DOI: 10.5296/jss.v2i2
    DOI: 10.5296/jss.v2i2.10440
    Language: Unknown
    Publisher: Macrothink Institute, Inc.
    Publication Date: 2016
    detail.hit.zdb_id: 2855600-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Rebar Detection with Cover Meter and Ultrasonic Pulse Echo Combined with Automated Scanning System
    SAGE Publications ; 2011
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2251, No. 1 ( 2011-01), p. 123-131
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2251, No. 1 ( 2011-01), p. 123-131
    Abstract: A sufficient concrete cover is essential to ensure the durability of reinforced concrete structures. Nondestructive testing methods that can measure the concrete cover are therefore promising tools. As a part of a research project funded by the Florida Department of Transportation, the capabilities and limitations of cover meter measurements in relation to this testing problem were investigated. Researchers designed a reinforced concrete test block on which properties such as rebar depth, size, and spacing and number of reinforcement layers were varied; the effects these variations had on the measurements were studied. The use of an automated testing frame consisting of two scanners that examined the test block from both sides ensured high positioning accuracy and constant quality in data acquisition and made possible the collection of the data along an extremely dense grid. In addition to the cover meter measurements, which referred only to the cover of the layer closest to the surface, ultrasonic pulse echo measurements were conducted, and a synthetic aperture focusing technique was applied to the data to make the rebars become apparent in refined B-scan images.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2251-13
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2011
    detail.hit.zdb_id: 2403378-9
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Comparative Performance Tests and Validation of NDT Methods for Concrete Testing
    Springer Science and Business Media LLC ; 2008
    In:  Journal of Nondestructive Evaluation Vol. 27, No. 1-3 ( 2008-9), p. 59-65
    Details
    In: Journal of Nondestructive Evaluation, Springer Science and Business Media LLC, Vol. 27, No. 1-3 ( 2008-9), p. 59-65
    Type of Medium: Online Resource
    ISSN: 0195-9298 , 1573-4862
    URL: Article
    DOI: 10.1007/s10921-008-0037-1
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2008
    detail.hit.zdb_id: 2017032-4
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    UACIS: Uncrewed Aerial Concrete Inspection System
    NDT.net GmbH & Co. KG ; 2022
    In:  e-Journal of Nondestructive Testing Vol. 27, No. 9 ( 2022-09)
    Details
    In: e-Journal of Nondestructive Testing, NDT.net GmbH & Co. KG, Vol. 27, No. 9 ( 2022-09)
    Abstract: The main challenge to the automation of NDE is the compound problem between the wide variety of NDT (non-destructive technique) available coupled with the diversity of infrastructures to be inspected. In some cases, the identification of flaws may require multiple complementary NDT to assert confidence in the results, adding further complexity to the issue. In this context, developing an automated system applicable to a wide variety of inspection conditions is an arduous task. Yet, targeting a wide range of applications, reducing inspection time or increasing safety are all essential factors to making such development worthwhile. This study aims to achieve the automation or semi-automation of ultrasonic NDT for concrete inspection using a UAV. Two NDT techniques are being considered, Impact Echo and Ultrasonic testing using Dry Point Contact transducers. Challenges regarding the mechanical and electric implementation of the NDT payloads to the UAV as well as the impact of the UAV on the recorded NDT data will be discussed and initial results will be presented.
    Type of Medium: Online Resource
    ISSN: 1435-4934
    URL: Article
    DOI: 10.58286/27305
    Language: Unknown
    Publisher: NDT.net GmbH & Co. KG
    Publication Date: 2022
    detail.hit.zdb_id: 2021293-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Intégration d’un système CND Impact Echo sur un drone
    NDT.net GmbH & Co. KG ; 2023
    In:  e-journal of nondestructive testing Vol. 28, No. 9 ( 2023-09)
    Details
    In: e-journal of nondestructive testing, NDT.net GmbH & Co. KG, Vol. 28, No. 9 ( 2023-09)
    Abstract: L’automatisation, même partielle, des procédures de contrôle non-destructif des structures dans le domaine du génie civil présente de nombreux avantages. Parmi ses avantages, on peut citer une plus grande répétabilité des mesures, une diminution des erreurs liée au facteur humain ainsi que la réduction du risque de compromettre la sécurité des personnes. Cette étude explore le concept et le développement du projet UACIS (Uncrewed Aerial Concrete Inspection System), en particulier l’intégration d’un système de mesure Impact Echo. Le projet UACIS consiste à embarquer différentes méthodes de CND par ultrasons via des charges utile interchangeable sur un drone à hélice dans le but de faciliter l’inspection de structure en béton. En particulier, UACIS a pour but de faciliter l’inspection de zones en hauteur dont l’accès s’avère dangereux et difficile. Le drone utilisé dans cette étude est un robot commercial développé par ©Voliro Airbone Robotics qui a été conçu spécifiquement pour permettre un contact physique, en cours de vol, entre le système de mesure embarqué et la structure inspectée. Un système d’inspection Impact Echo, comprenant une sonde piézoélectrique et un élément de frappe solénoïde, a été intègre au drone. Cette méthode est communément utilisée pour l’inspection de structure en béton. L’élément de frappe permet de générer des ondes acoustiques dans le matériau, les ondes sont ensuite captées par la sonde piézoélectrique puis converties en signal A-scan et spectre de fréquence. L’analyse du spectre de fréquence et la connaissance de la vitesse des ondes dans le matériau permettent de caractériser la structure. Les différentes contraintes liées à l’intégration du CND impact écho au drone ainsi que les premiers résultats et mesures effectués seront présenter. Parmi les sujets abordés seront notamment les restrictions en matière de poids et de dimensions, la communication entre les différentes interfaces, la mise en place d’un transfert de données sans fil en temps réel entre le système CND/drone et l'interface utilisateur au sol, l’actionnement à distance de l’élément de frappe et de la sonde, les stratégies d'atténuation du bruit et de traitement du signal.
    Type of Medium: Online Resource
    ISSN: 1435-4934
    URL: Article
    DOI: 10.58286/28518
    Language: Unknown
    Publisher: NDT.net GmbH & Co. KG
    Publication Date: 2023
    detail.hit.zdb_id: 2021293-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Simulation-based deep learning model for the detection of imperfections in concrete structures
    NDT.net GmbH & Co. KG ; 2022
    In:  e-Journal of Nondestructive Testing Vol. 27, No. 9 ( 2022-09)
    Details
    In: e-Journal of Nondestructive Testing, NDT.net GmbH & Co. KG, Vol. 27, No. 9 ( 2022-09)
    Abstract: The objective of the current study is the development of a deep learning model in order to detect and characterize relevant imperfections in steel reinforced concrete. Especially structural noise can affect the signal quality and needs to be considered. The application of deep learning algorithms requires a large and complete data set. However, experimental data acquisition is limited due to the designs and fabrication of test samples. Consequently, training a model only using experimental data is hardy possible in the current case. Hence, in this study various virtual ultrasonic inspections are conducted with the commercial simulation software CIVA. The simulation takes into account structural noise in order to model the imperfections as realistic as possible. Different types of imperfections are considered such as honeycombs. Using simulation offers the chance to generate a large data set which is required for the training of deep learning models. Furthermore, the parameters can be systematically varied within the simulation which guarantees a complete data set. The simulated inspection data which contains noise is used to train a deep learning model with the internally developed software Echolyst A.I.. Finally, the model is validated with experimental data of honeycomb inspections. The study shows the potential of artificial intelligence in order to significantly increase the effectivity of ultrasonic inspections of imperfections in steel reinforced concrete structures.
    Type of Medium: Online Resource
    ISSN: 1435-4934
    URL: Article
    DOI: 10.58286/27308
    Language: Unknown
    Publisher: NDT.net GmbH & Co. KG
    Publication Date: 2022
    detail.hit.zdb_id: 2021293-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    Online Resource
    Online Resource
    Evaluation of the Embrittlement in Reactor Pressure-Vessel Steels Using a Hybrid Nondestructive Electromagnetic Testing and Evaluation Approach
    MDPI AG ; 2024
    In:  Materials Vol. 17, No. 5 ( 2024-02-28), p. 1106-
    Details
    In: Materials, MDPI AG, Vol. 17, No. 5 ( 2024-02-28), p. 1106-
    Abstract: The nondestructive determination of the neutron-irradiation-induced embrittlement of nuclear reactor pressure-vessel steel is a very important and recent problem. Within the scope of the so-called NOMAD project funded by the Euratom research and training program, novel nondestructive electromagnetic testing and evaluation (NDE) methods were applied to the inspection of irradiated reactor pressure-vessel steel. In this review, the most important results of this project are summarized. Different methods were used and compared with each other. The measurement results were compared with the destructively determined ductile-to-brittle transition temperature (DBTT) values. Three magnetic methods, 3MA (micromagnetic, multiparameter, microstructure and stress analysis), MAT (magnetic adaptive testing), and Barkhausen noise technique (MBN), were found to be the most promising techniques. The results of these methods were in good agreement with each other. A good correlation was found between the magnetic parameters and the DBTT values. The basic idea of the NOMAD project is to use a multi-method/multi-parameter approach and to focus on the synergies that allow us to recognize the side effects, therefore suppressing them at the same time. Different types of machine-learning (ML) algorithms were tested in a competitive manner, and their performances were evaluated. The important outcome of the ML technique is that not only one but several different ML techniques could reach the required precision and reliability, i.e., keeping the DBTT prediction error lower than a ±25 °C threshold, which was previously not possible for any of the NDE methods as single entities. A calibration/training procedure was carried out on the merged outcome of the testing methods with excellent results to predict the transition temperature, yield strength, and mechanical hardness for all investigated materials. Our results, achieved within the NOMAD project, can be useful for the future potential introduction of this (and, in general, any) nondestructive evolution method.
    Type of Medium: Online Resource
    ISSN: 1996-1944
    URL: Article
    DOI: 10.3390/ma17051106
    Language: English
    Publisher: MDPI AG
    Publication Date: 2024
    detail.hit.zdb_id: 2487261-1
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    Online Resource
    Online Resource
    Impact Echo Data Analysis Based on Hilbert-Huang Transform
    SAGE Publications ; 2007
    In:  Transportation Research Record: Journal of the Transportation Research Board Vol. 2028, No. 1 ( 2007-01), p. 146-153
    Details
    In: Transportation Research Record: Journal of the Transportation Research Board, SAGE Publications, Vol. 2028, No. 1 ( 2007-01), p. 146-153
    Abstract: Impact echo is an acoustic method based on the use of transient stress waves generated by an elastic impact; it is used for nondestructive testing of concrete structures. In practical applications, the signals obtained often are superimposed by further mechanical vibrations and the so-called geometry effects, which are caused mainly by surface waves. Because of attenuation in the concrete as well as the divergence of the acoustical waves, impact echo signals are transient. As a result, the frequency content changes over time. Normally the analysis is carried out on the Fourier power spectrum of the signal. However, the Fourier spectrum is still affected by the mentioned effects and has well-known deficiencies for short transient signals within longer time sweeps. Application of the Hilbert-Huang transform is presented as a refined method for the time-frequency analysis of nonstationary impact echo data. The basic properties of the method and its practical application for time-frequency analysis of impact echo data, signal filtering, and pattern identification are presented.
    Type of Medium: Online Resource
    ISSN: 0361-1981 , 2169-4052
    URL: Article
    DOI: 10.3141/2028-16
    Language: English
    Publisher: SAGE Publications
    Publication Date: 2007
    detail.hit.zdb_id: 2403378-9
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...