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 131 for “"NDE"”.
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Considerations for automated NDE applications
… in the field of Non Destructive Evaluation (NDE). The process of detailed imaging and examination of structures and components in a sensitive, safe and inherently non-intrusive manner has numerous advantages in operational, financial and safety terms. Only by delivering NDE sensors directly …
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EROBOT : a second-generation NDE inspection robot
Includes bibliographical references (p. 66-69).
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Assessment of Infrared Thermography for NDE of FRP Bridge Decks
… structural engineering, effective and efficient NDE techniques must be explored and documented in these situations. This thesis will discuss the use of Infrared Thermography (IRT) as a means of detecting debonds and voids caused by conditions encountered both in fabrication and in the field. As …
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BOND STRENGTH EVALUATION IN ADHESIVE JOINTS USING NDE AND DIC METHODS
… of existing non-destructive evaluation (NDE) methods to non-destructively detect/characterize these interfacial defects and reliably predicting the bond shear strength. As a result, adhesive bonding technology is still not solely implemented in primary structures of an aircraft. …
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Develop Sonic Infrared Imaging Nde For Local Damage Assessment In Civil Structures
<p>Nondestructive Evaluation (NDE) is an interdisciplinary field of study, which is concerned with the development of analysis techniques and measurement technologies for the quantitative characterization of materials, tissues and structures. Ultrasonic IR Imaging is a novel NDE technique, which …
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Capacitor-Probe Calibration and Optimization for NDE Application to Portland Cement Concrete
… them, and the dielectric constant of the PCC under test. Thus, an optimum design for different desired penetration depth was achieved. Two experimental designs were developed to identify the critical parameters that affect the bulk dielectric constant of PCC. A computer simulation was used to …
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Study Of Chaotic Ultrasound And Frequency Sweep Excitations In Sonic Ir Nde Technology
<p>Sonic Infrared (IR) Imaging Nondestructive Evaluation (NDE) technology has shown inherent advantages, such as fast detection for all direction and all dimension flaws, for both metal and composite materials. The purpose of this dissertation is to study and investigate the physical process of two …
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A "divide-and-conquer" strategy for NDE signal inversion in gas transmission pipelines
<p>Signal inversion in nondestructive evaluation (NDE) applications is a critical step before remediation decisions are made. The accuracy and confidence of the signal inversion results therefore play a key role in evaluating the effectiveness of the NDE procedure. Conventional NDE signal inversion …
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A critical analysis of the acoustic emission technique for NDE of pressure vessels
As a nondestructive examination, the acoustic emission technique is used to detect the presence of discontinuities inside of pressurized components. However, doubts still exist concerning the loading procedure to accomplish the acoustic emission testing, especially, in a pressure vessel where a …
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Electronic Speckle Pattern Interferometry (ESPI) NDE of cracks in pressure vessels with FEA modelling
… the fringe patterns for a crack free cylinder and compare these with these observed experimentally. The FE model modulus of elasticity was than to be calibrated to minimise uncertainty in the exact value of the elastic modulus. Once the model was calibrated, various cracks and combinations …
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MEDYA VE MODERNLESME: 1945–1960 DÖNEMİNDE NATIONAL GEOGRAPHIC DERGİSİ’NDE TÜRKİYE’NİN SUNUMU
… sonrası dönemde National Geographic Dergisi'nde Türkiye'nin sunumudur. Bu dönemde gerek Amerika'daki sosyal bilimler alanında, gerekse Amerika'nın dıs politikasında önemli degisiklikler olmustur. Az gelismis ya da gelismekte olan diye nitelendirdikleri ülkelerin modernlesmesine odaklanan …
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Machine learning-based non-destructive evaluation of fatigue damage in metals
Non-destructive evaluation (NDE) of fatigue damage in metals is crucial for ensuring high product performance and safety. In remanufacturing, NDE for the incoming recycled metal materials is also essential to maximize the benefits of utilizing such materials. However, critical challenges exist in …
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Investigation of carburization extent from the inner diameter (ID) of ethylene furnace tubes using non-destructive examination (NDE) applied on the outer diameter (OD)
… the inside of ethylene pyrolysis tubes using nondestructive tools applied to the outer surface. A carburization test was conducted in a specially designed and manufactured HK-40 alloy tube. Ethylene pyrolysis is considered the most important process in the petrochemical industry for producing …
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Non-Destructive Bridge Deck Condition Assessment with a Probability-Based Deterioration Threshold
… In past decades, Non-Destructive Evaluation (NDE) techniques, capable of detecting various deteriorations types, e.g., cracking, delamination and reinforcing steel corrosion, have emerged. These techniques generate large amounts of data representing different underlying physics, (decibels for …
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INTELLIGENT NON-DESTRUCTIVE EVALUATION EXPERT SYSTEM FOR CARBON-CARBON COMPOSITES USING THERMOGRAPHY, ULTRASONICS, AND COMPUTED TOMOGRAPHY
… reliable intelligent non-destructive evaluation (NDE) expert system for carbon-carbon (C/C) composites based on thermography, ultrasonic, computed tomography and post processing by means of fuzzy expert system technique. Data features and NDE expert knowledge are seamlessly combined in the …
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The development of an interpretive methodology for the application of real-time acousto-ultrasonic NDE technique for monitoring damage in ceramic composites under dynamic loads
… a near real-time, acousto-ultrasonic (AU), nondestructive evaluation (NDE) tool to study the failure mechanisms of ceramic composites. Progression of damage is monitored in real-time by observing the changes in the received AU signal during the actual test. During the real-time AU test, the AU …
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Nondestructive evaluation of historic structures
… loads than those that were originally intended. It is typically less expensive to simply replace a structure than to restore it, so the decision to restore is usually based on the historical significance of that structure to the owner. Often, because of the age of the structure, the …
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Dual-Use Strain Sensors for Acoustic Emission and Quasi-Static Bending Measurements
… has significantly enhanced the fields of nondestructive evaluation (NDE). Their application of piezoelectric materials allows for the sensing of low energy, high frequency acoustic emission (AE) events such as fatigue cracking in metals and delamination in composites. Utilizing the physical …
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Nondestructive Evaluation/characterization of Airport Pavements Using Stress Wave Methods
… single, or ensemble-averaged, impulse-generated NDE tests using the methodology presented in this work. As a result, the NDE method may be considered as a forward step towards the development of a universal design, characterization, and evaluation methodology that integrates the NDE method, and …
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Níveis de dano econômico para o controle químico e biológico de Sphenophorus levis em cultivos de cana-de-açúcar de sequeiro e irrigado
… (uso do fungo Beauveria bassiana). Apesar da grande importância econômica de S. levis, são poucos os estudos relatando o nível de dano econômico (NDE) para tomada de decisão desta praga e os fatores determinando seu ataque. Assim, este trabalho teve como objetivo determinar o NDE para S. levis em …
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