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 46 for “"Non-destructive testing (NDT)"”.
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The Assessment of Sonic Waves and Tracer Gases as Non-Destructive Testing (NDT) Methods for In-Situ Underground Mine Seals
… become necessary to assess 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 …
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Vibration excitation of aerospace composite materials for defect determination using optical NDT techniques (ESPI/Shearography)
… based digital interferometric techniques used to non-destructively identify defects in small and large structures. Vibration excitation is proposed to be used as the excitation method for the above Non-Destructive Testing (NDT) techniques. The material may or may not contain any defects, in which …
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The Development of Novel Apparatus, Systems, and Methods for Non-Invasive Thermal Interrogation (NITI)
Non-Invasive Thermal Interrogation (NITI) is a form of non-destructive testing (NDT) that uses simultaneous measurements of object surface heat flux and object surface temperature. When these measurements are combined with signal processing algorithms, such as parameter estimation routines or other …
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The Reliability of Manual Ultrasonics in Detecting Internal Corrosion Within Carbon Steel Pipework
Manual ultrasonics (MUT) is a non-destructive testing (NDT) technique used to detect wall thickness measurements on a variety of components within the oil and gas industry. This research aims to critically appraise the factors that affect the MUT task and apply the findings to make the necessary …
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Anisotropic wave guides-- propagation, focusing and dispersive phenomena with applications for non-destructive testing.
Acoustic Non-Destructive Testing (NDT) has a long history of applications in fatigue monitoring, fault testing, and more recently production control. A very large family of manufactured and raw materials consist of thin layers. Some examples include rolled aluminum, window glass, plywood, …
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In situ determination of strength and stiffness of structural lumber and composite products
… of visual inspections lacking scientific basis.;Non-destructive testing (NDT) methods were investigated by this research for the possibility of evaluating modulus of rupture and modulus of elasticity of built-in wooden members. Methods included stress wave timing for dynamic MOE determination and …
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Defect detection using 3D computed tomography images and application on nuclear power plants
… long duration required for manual inspection, non-destructive testing (NDT) can be implemented. In this thesis, a novel NDT framework is developed using key image processing functions to localize and identify the missing and misplaced components of NPP inspection tools using 3D CT data. …
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Comparative study of non-destructive testing methods of defect detection on aircraft
… light-weight structures is a new challenge for non-destructive testing (NDT) which requires techniques that respond with a high probability of detection of defects on such high-specific strength materials. In this thesis, Digital shearography and Infrared Thermography (IRT) techniques are …
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Finite element modeling of crack detection in aircraft structures using electrical current
Various non-destructive test methods have been developed for the detection of cracks in metallic structures. 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 …
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Accurate characterisation of surface fatigue cracks (in steels) using the AC potential drop NDT technique
… of an AC potential 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 …
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Optical measurement of deformation fields and surface processes with digital speckle correlation
… environments outside the laboratory, e.g. in Non-Destructive Testing (NDT) applications. In the first part of the thesis, a new technique is presented to determine the complete deformation field, in particular the hitherto inaccessible out-of-plane component. The measurement relies on the …
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Detection of defects in FRP-reinforced concrete with the acoustic-laser vibrometry method
… may not be possible. Most currently available non-destructive testing (NDT) methods rely on physical contact; an NDT method that is capable of remotely assessing damage would be greatly advantageous. A novel approach called the acoustic-laser vibrometry method which is capable of remote …
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Evaluating the Traffic Speed Deflectometer (TSD) for network-level screening of pavements in Michigan
… (TSD) has emerged as an alternative non-destructive testing (NDT) technology that allows for continuous pavement data collection at traffic speed without having the need for lane closures. Its’ usage focus has been researched mostly for flexible pavements, while its application for …
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Analysing method for acoustic emission clustering system on reinforced concrete beam
Acoustic Emission (AE) is a non-destructive testing (NDT) method used for damage detection in structural engineering. Nowadays, NDT is widely used especially on continuous real-time monitoring systems with minimum labour involvement. It could also be used to discriminate the different types of …
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Improving the Sustainability of Performance-Based Concrete Overlay Mix Design made with Rounded Aggregate
… the correlation between compressive strength and non-destructive testing (NDT) methods is examined. Establishing reliable NDT-strength relationships under varying thermal conditions will improve the accuracy of in-situ performance evaluation for overlays. The final phase assesses the …
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Novel Application of Nondestructive Testing to Evaluate Anomalous Conditions in Drilled Shafts and the Geologic Materials Underlying Their Excavations
… capacity. Due to 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 …
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A Self-contained Wireless Structural Health Monitoring Tool
… these structures actively or passively using non-destructive testing (NDT) and non-destructive inspection (NDI) techniques. NDI crack detection and strain measurement systems are currently used in critical areas of structures, but are limited due to needing wires for communication and a power …
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In-situ assessment of concrete bridge decks and pavements using stress-wave based methods
… based on the comparison analysis with other destructive or non-destructive testing (NDT) methods carried out in the field or laboratory for the same bridge decks and pavement segments, such as the concrete hydro-demolition, drilling, static modulus of elasticity of concrete specimens in …
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Application of P-wave Reflection Imaging to Unknown Bridge Foundations and Comparison with Other Non-Destructive Test Methods
… incorporated into the foundations. Several non-destructive testing (NDT) methods have been developed to evaluate these unknown foundations. The primary objective of this research is to identify the most current and widely used NDT methods for determining the embedment depth of unknown bridge …
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Multi-scale metrology for automated non-destructive testing systems
… diffcult to inspect rapidly using conventional Non-Destructive Testing (NDT) techniques. Industrial robots provide a means of automating the inspection process due to their high dexterity and improved path planning methods.This thesis concerns using industrial robots as a method for assessing …
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