Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 127 for “"NDT"”.
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Fusion of multiprobe NDT data.
Non-destructive testing techniques (NDT) are commonly used by industry to check for faults, flaws and structural integrity of a component. Early detection and characterisation of defects can improve manufacturing quality and safety. The main advantage of NDT techniques is that the component …
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A novel compact Shearographic NDT system
There is a need in industry and the NDT (Non-destructive Testing) community for quick, reliable, user-friendly and cost-effective compact NDT systems that can be used on a wide variety of materials and structures, for quality assurance and maintenance. Designing and building a compact Shearographic …
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NDT to characterize 3D printed concrete interlayer bonds
… This research examines nondestructive testing (NDT) techniques that characterize the interlayer bond quality (bond strength) of 3D printed concrete in situ. An experimental study applied four NDT methods (x-ray radiography, ultrasonic pulse velocity (UPV), vibration resonance, and multi-element …
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Generation of high resolution tomographic images for NDT applications
Techniques for the generation of quantitative ultrasonic images in non-destructive testing have generally involved a substantial cost in terms of data storage and computational time, and have thus found limited application. Preference has therefore been given to the more straightforward imaging …
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Vibrational methods applied to NDT testing and fluid density measurement
… of thin rectangular bars were used for the NDT work. A machined cut in a bar had a significant effect on the spectrum but a genuine crack gave an unambiguous response at high amplitudes. This was the generation of fretting crack noise at frequencies far above that of the drive. A specially …
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Non-Contact NDT of Concrete Structures Using Air -Coupled Sensors
The second application is air-coupled impact-echo. Two reinforced concrete slabs containing different types of defects were inspected using an air-coupled impact test testing scheme. 2-D scanning impact-echo tests were conducted over the slab containing voids and delaminations. The 2-D scanning …
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An air-coupled ultrasonic array scanning system for rapid through transmission NDT
Within the aerospace industry there is an increasing requirement to investigate the structural integrity of the new composite materials that are now being used frequently in the manufacture of aircraft. The complexity of the material manufacture necessitates that evaluation is required prior to …
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Ultrasonic NDT Methods for the Evaluation of Post-Tensioned Systems with Flexible Fillers
<p>Non-destructive evaluation of post-tensioned structures with flexible fillers is desperately needed due to their rapid implementation in the State of Florida, primarily in roadway structures. This study provides an overview of existing evaluation methods for traditional post-tensioned structures …
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NDT application in Transport Asset Management. QA/QC performance specifications in pavement construction and maintenance
Al giorno d oggi, nel Transport Asset Management, c è la necessità di identificare misure atte a garantire elevati livelli prestazionali nel tempo. L'applicazione di tecniche non distruttive, attraverso strumenti ad alta efficienza, risulta essere una soluzione ottimale per garantire la qualità …
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Vibration excitation of aerospace composite materials for defect determination using optical NDT techniques (ESPI/Shearography)
… method for the above Non-Destructive Testing (NDT) techniques. The material may or may not contain any defects, in which case the flaws are to be artificially induced.
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Accurate characterisation of surface fatigue cracks (in steels) using the AC potential drop NDT technique
… drop (ACPD) system as a non-destructive testing (NDT) technique for flaw detection and sizing of variously shaped and oriented surface breaking fatigue cracks. The ACPD method was reviewed to establish its viability as an NDT technique, and to understand the response of the output to fatigue …
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Full waveform inversion of ultrasonic phased array data for the tomographic reconstruction of heterogeneous media for NDT
Within the ultrasonic non-destructive community the benchmark imaging algorithm assumes that the host material is homogeneous. This can lead to poor flaw detection, location, and characterisation. However, when the heterogeneous nature is accounted for within an imaging algorithm there is a …
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The Assessment of Sonic Waves and Tracer Gases as Non-Destructive Testing (NDT) Methods for In-Situ Underground Mine Seals
… the effectiveness of non-destructive testing (NDT) technologies to determine seal integrity, which in this case, are explored using sonic waves and tracer gases. Through both small and large scale testing, two NDT methods were evaluated on their abilities to determine integrity of the seal. A …
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The use of nondestructive testing methods for the condition assessment of concrete bridge girders
… condition of a bridge. The second way by which NDT can help is by allowing inspectors to locate damage earlier. This thesis is an attempt to capture the most current ideas for a very specific application of NDT: determining the condition of reinforced concrete bridges overall and bridge girders, …
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Consórcio capim-braquiária com milho ou soja: Produção e composição químico-bromatológica das silagens
… (CNF) e de nutrientes digestíveis totais (NDT) na matéria seca (MS). Já as variáveis de produtividade avaliadas no capim foram a produção de MS, PB e NDT por hectare. Em média, a fração folha apresentou maiores teores de PB, menores teores de FDN e de LIG que a fração colmo independente do …
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Life extension of structural components via an improved nondestructive testing methodology
… sensitivity of advanced nondestructive testing (NDT) techniques with respect to structural applications. The techniques analyzed exemplify the incorporation of digital technology into NDT and includes the following: meandering winding magnetometer array (MWM-array@) eddy current, phased-array …
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Finite element modeling of crack detection in aircraft structures using electrical current
… Electromagnetic non-destructive testing (NDT) is one of the widely used non-destructive methods used for the detection and characterization of cracks. Utilizing the principle of electromagnetic induction, this technique is used in the areas of nuclear, aerospace, power, transport, …
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Novel Application of Nondestructive Testing to Evaluate Anomalous Conditions in Drilled Shafts and the Geologic Materials Underlying Their Excavations
… their inaccessibility, non-destructive testing (NDT) techniques have received much attention for drilled shaft quality control. However, there are limitations in the NDT tools currently used for structural integrity testing. Moreover, there is no current NDT tool to evaluate conditions underlying …
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Evaluating The Most Reliable Combination Of Non-Destructive Test Methods For Concrete Uniformity And Relative Compressive Strength.
… concrete where they have been extracted, while NDT testing can be conducted in as many areas on the concrete in order to obtain a true characterisation of the properties of concrete without causing any destruction to a concrete structure. The non-destructive testing approach is also preferred …
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Condition assessment of GFRP-retrofitted concrete cylinders using electromagnetic waves
… to develop an integrated nondestructive testing (NDT) capability, termed FAR NDT (Far-field Airborne Radar NDT), for the detection of defects, damages, and rebars in the near-surface region of glass fiber reinforced polymer (GFRP)-retrofitted concrete cylinders through the use of far-field radar …
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