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 13 of 13 for “"nondestructive testing (NDT)"”.
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NDT to characterize 3D printed concrete interlayer bonds
… material quality useless. 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 …
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Acoustic Emission Fatigue Crack Monitoring of a Simulated Aircraft Fuselage Structure
… each of the AE sources. Thus, acoustic emission nondestructive testing (NDT), in combination with a SOM neural network, proved to be an excellent means of fatigue crack growth monitoring in a simulated aluminum aircraft structure.</p>
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Life extension of structural components via an improved nondestructive testing methodology
… the flaw detection 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 …
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Condition assessment of GFRP-retrofitted concrete cylinders using electromagnetic waves
… of this study is 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 …
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Orthogonally coded array for high-speed synthetic aperture radar (SAR) imaging
Synthetic aperture radar (SAR) imaging, for nondestructive testing (NDT) purposes, has been applied to a wide range of applications. Within the SAR family, many different imaging systems have been designed and developed to optimize the tradeoffs between image quality, resolution, image production …
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Remote nondestructive evaluation of composite-steel interface by acoustic laser vibrometry
… to discern without the aid of some form of nondestructive testing (NDT). Acoustic laser vibrometry is a relatively new method of NDT that shows a lot of promise in analysis of this interface. In this approach, an airborne acoustic wave is utilized to excite the location of the damage …
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Residual Compressive Strength Prediction of Carbon/Epoxy Laminates Subjected to Low Velocity Impact Damage
… Detecting BVID 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, …
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Compression After Impact Load Prediction in Graphite/Epoxy Laminates Using Acoustic Emission and Artificial Neural Networks
… laminates from acoustic emission (AE) nondestructive testing (NDT) data. Thirty-four 24-ply bidirectional woven cloth laminate coupons were constructed and impacted at various energy levels ranging from 8 to 20 Joules, generating barely visible impact damage (BVID). Acoustic emission …
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Advancements in evaluation of air-coupled impact-echo test method
… recently-developed air-coupled impact-echo (IE) nondestructive testing (NDT) method, in which microphones replace the traditional physically-coupled IE sensors. To develop an optimum testing system and verify the new method, two concrete plates were tested in the laboratory, one of which was a …
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Probabilistic impact-echo method for nondestructive detection of defects around steel reinforcing bars in reinforced concrete
… assessment of engineered infrastructure using nondestructive testing (NDT) is critical to the proper scheduling of the maintenance and/or replacement of infrastructure components. In reinforced concrete structures, potentially adverse changes in the bond between concrete and reinforcing steel …
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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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Effective and Efficient Non-Destructive Testing of Large and Complex Shaped Aircraft Structures
… enhance the defect detection capabilities of nondestructive testing (NDT) for the aircraft industry. Modem aircraft non-destructive testing requires the detection of small defects in large complex shaped components. Research has therefore focused on the limitations of ultrasonic, radioscopic …
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Improving the Sustainability of Performance-Based Concrete Overlay Mix Design made with Rounded Aggregate
… 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 sustainability of developed …