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 36 for “"Ultrasonic Testing"”.
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Nonlinear ultrasonic testing using a non-collinear approach: application to heat treatment of steels and to asphalt concrete mixtures
Tests were performed to investigate micro-structural dependence of acoustic wave attenuation, velocity, and a non-linear parameter, non-collinear scattered wave amplitude. Specimens of various microstructures were prepared by means of heat treatment for 1045 and 4140 Steel. Nonlinear investigation …
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Intelligent Non-destructive Measurement and Evaluation Techniques for Aircraft Composites
… in anisotropic carbon composites by applying ultrasonic and infrared thermography NDE methods. To fulfill the requirement of the intelligent non-destructive evaluation methods, this research is divided into four sub-researches: fuzzy logic based delamination detection, super-resolution image …
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Weld inspection process improvement
… through the implementation of phased array ultrasonic testing. The chosen factory fabricates and machines large weldments for track-type tractors. The industry trend towards lighter weight, lower cost, higher performance structures requires greater confidence in weld quality than can …
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Development of nondestructive evaluation methodologies for polymer composite components prepared via additive manufacturing.
… in this thesis seeks to utilize nondestructive testing techniques to investigate fiber reinforced additive manufactured components and assess the effectiveness of these methods on quantifying features of interest, in order to further enable the use of additive manufacturing in structural …
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Multi-Angle Beam Generation and Steering via Meander-Line-Coil EMATs
… (EMATs) for the purposes of Non-Destructive Testing (NDT), focusing on their theoretical foundations, simulated modelling, and experimental validations. Whilst the detection of defects was not investigated, this work thoroughly examines the EMAT’s capability as a conventional transducer to …
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Ultrasonic characterization of Ti-5Al-5Mo-5V-3Cr
… will affect the inspection of this material with ultrasonic testing both for the purposes of flaw detection and material characterization. The connection between material properties and ultrasonic characterization techniques will be discussed and then dissected in the context of Ti-5553. This …
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Development of a generalized fatigue assessment approach for steel castings.
… evaluation (NDE) technique, such as phased array ultrasonic testing (PAUT), correlated to the proposed lower limits of the LEFM fatigue design approach.
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Fluidic ultrasound generation for nondestructive testing
Ultrasonic testing has become an indispensable method for verifying integrity, dimensional accuracy and material properties in numerous technical domains. Air-coupled ultrasound offers advantages in terms of measurement flexibility and reduced measurement time, but also presents challenges due to …
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Design Methodology for the Utilisation of A Structural Orthotropic Composite Materials by Micro-Enterprises
… to vibration tests and then verified through ultrasonic testing techniques and these are then fed into the numerical techniques used subsequently in the case study presented. Numerical techniques show how a product should be manufactured so that it has the desirable mechanical responses that …
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Nondestructive evaluation for hybrid-composite girder bridges
… evaluation (NDE) technologies of thermography, ultrasonic testing, and acoustic emission testing to assess the quality of placement within the arch section of the HCB. Tap testing, another NDE technique, was also used to test the quality of the FRP shell construction. The research shows that …
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Signal processing techniques for ultrasonic inspection
This thesis discusses the need for nondestructive testing and highlights some of the limitations in present day techniques. Special interest has been given to ultrasonic examination techniques and the problems encountered when they are applied to thick welded plates. Some suggestions are given …
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Review : integration of EMI technique with global vibration technique
… damage detections, such as visual inspection and ultrasonic testing, have been implemented since the mid 20th century. However, these techniques often require prior knowledge of potential damage locations and require bulky testing equipment. Alternative techniques, the Global Vibration Techniques, …
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An invariance transformation algorithm for defect characterization of ultrasonic signals for the nondestructive evaluation of concrete
… with difficulty. Typically, variations in the testing signal due to operational parameters have created a significant challenge for defect characterization. This thesis proposes, develops, and validates a defect characterization algorithm that compensates for operational variables and maps the …
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Residual Compressive Strength Prediction of Carbon/Epoxy Laminates Subjected to Low Velocity Impact Damage
… is only possible by implementing nondestructive testing (NDT) techniques. Depending upon the support conditions, material system, laminate thickness, lay-up orientation, and impactor geometry, velocity, and hardness, the types of damage associated with BVID include delaminations, longitudinal and …
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Structural Health Monitoring Using Multiple Piezoelectric Sensors and Actuators
… utilizes the pulse-echo method often used in ultrasonic testing, together with wavelet decomposition to extract traveling pulses from a noisy signal. The results for a one-dimensional structure show that we can determine the damage location to within a spatial resolution determined by the …
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Inspection of Ferromagnetic Support Structures From Within Alloy 800 Steam Generator Tubes Using Pulsed Eddy Current
Nondestructive testing is a critical aspect of component lifetime management. Nuclear steam generator (SG) tubes are the thinnest barrier between irradiated primary heat transport system and the secondary heat transport system, whose components are not rated for large radiation fields. Conventional …
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A critical investigation of the use of infrared thermography in determining the condition of composite materials
… were subject to modified Charpy and ballistic testing to create barely visible impact damage (BVID). The damaged parts were then subjected to inspection using techniques such as pulsed thermography, thermoelastic stress analysis (TSA), immersion ultrasonic testing, microscopy and laser doppler …
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Understanding the correlation between wrinkle morphology, fracture and fatigue of plain woven CFRP laminates through mechanical and ultrasonic characterization.
… along with the development of a novel ultrasonic characterization technique for wrinkle detection and quantification. In the first part of the study, a co-curing-based fabrication technique was developed to embed controlled wrinkle topologies at the ply interface in double cantilever …
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Closure integrity testing of heat sealed aseptic packaging using scanning acoustic microscopy
… was to determine the possible application of ultrasonic inspection for non-destructive, online evaluation of the integrity of heat sealed, flexible package structure commonly used in packaging of aseptic and shelf-stable food products. A scanning acoustic microscope (SAM), Olympus UH-3, and …
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