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 23 for “"non-destructive test"”.
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A rapid, non-destructive test to detect camshaft lobe grinding burn
… along the ramps and base circle. Several non-destructive examination techniques were then compared with each other to discover which best detected burn. Intercomparison involved evaluating the strength and consistency of the measurement signal. Background noise occurred in all cases due to …
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The integration of non-destructive test methods in the South African Durability Index approach
… structures. The oxygen permeability index (OPI) test is being standardised in South Africa, and has been implemented in a large scale project by the South African National Roads Agency Limited (SANRAL). However, the semi-invasive nature of the test method (due to core extraction) has been seen as …
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Evaluating The Most Reliable Combination Of Non-Destructive Test Methods For Concrete Uniformity And Relative Compressive Strength.
… control has resulted in an increasing demand for non-destructive testing to ascertain the compressive strength and quality of concrete, at both the construction stage and during the service life of concrete structures. This is because destructive testing approaches such as core drilling are mainly …
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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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INVESTIGATION OF SPOT WELDING ELECTRODE TIP WEAR AND A NON-DESTRUCTIVE TEST OF PLASTIC JOINING IN THE AUTOMOTIVE INDUSTRY
… with the standard is that the most reliable test is a destructive test, which not only destroys a potentially good weld, but it stalls the entire production line in order to perform the test. This is a process where the weld is taken apart sometimes with a chisel. Once the weld is dismantled …
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The detection of defects in tubes and plates using guided waves
Eddy current testing is the non-destructive test method of choice for the inspection of condenser tubes. However, unplanned shutdowns of power stations, due to unexpected condenser tube failures, still occur despite rigorous eddy current inspection programs. In addition to the improvement required …
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A non-destructive transformer oil tester
A new non-destructive test of transformer oil dielectric strength is a promising technique to automate and make more reliable a diagnostic that presently involves intensive manual efforts. This thesis focuses some of the issues that must be understood to bring the test from the laboratory to the …
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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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Statistical methods applied to acousto-ultrasonic technique
… The cost of composite materials dictates that non-destructive test methods be used. At the same time, the nature of composites limits the use of conventional techniques such as radiography , eddy-current or ultrasonics. Recently, a new technique known as the Acousto-Ultrasonic (AU) technique, …
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Evaluation Of Space Shuttle Tile Subnominal Bonds
… Isolation Pad and the tile substrate itself. Tests were run to identify the cause of these subnominal conditions and also to show how these conditions were proved to be acceptable for flight. The study also goes into cases that could be used to identify subnominal conditions on tile as a …
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A New Spectroscopic Method for the Non-Destructive Characterization of Weathering Damage in Plastics
… composite part. Clearly a rapid, reliable, and non-destructive test for the extent of the weathering damage is critically needed. A recent problem that arose at Superyacht Solutions, a boat repair company in Australia, required a solution to just this problem. Such a test was developed for …
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Detection of multiple defects based on structural health monitoring of pipeline using guided waves technique
… or damages for avoiding disasters. Although most Non Destructive Test (NDT) techniques are able to detect and locate damage during the maintenance intervals, interrupted services could result in high cost and lots of time consumed. In addition, most NDTs are utilized to detect and locate single …
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Terahertz imaging and quantum cascade laser based devices
… the development of terahertz imaging systems for non-destructive test. However, the weak radiation sources in these existing systems result in single pixel scanning architectures requiring minutes to acquire images or enhanced speed at the expense of signal to noise ratio (SNR). In this thesis, a …
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Natural frequencies evaluation on existing reinforced concrete bridges using microtremor testing
… for newly constructed and old bridges to be tested using simple dynamic test such as microtremor test in order to determine the natural frequencies of the bridges. Microtremor is also known as ambient vibration test. The test is a non-destructive test and easy to be conducted with less labor, …
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Compact power conditioning and RF systems for a high power RF source
… flux compression generator (FCG) was built as a non-destructive test stand to evaluate the power conditioning and RF systems. The FCG simulator approximated the rising current signal of an FCG with a peak between 20 kA and 60 kA. The power conditioning system consisted of a spiral-strip pulse …
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The characterisation of multiple defects in components using artificial neural networks
… (ANNs) as a means of processing signals from non-destructive tests, to characterise defects and provide more information regarding the condition of the component than would otherwise be possible for an operator to obtain from the test data. ANNs are used both as pattern classifiers and as …
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Correlation of corrosion measurements and bridge conditions with NBIS deck rating
… Therefore, it is important to determine if the nondestructive corrosion activity detection methods are applicable to ECR as well as institute guidelines for interpreting the results. Since the corrosion of reinforcing steel is directly responsible for damage to concrete structures, it is …
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Development of the small punch test platform to evaluate the embrittlement of power plant materials
… practises. Mechanical, metallurgical and non-destructive techniques are used to evaluate the condition of the in-service materials in order to aid in these life assessments. The structural integrity assessments utilise material toughness properties as determined through fracture toughness …
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Correlation-Based Detection and Classification of Rail Wheel Defects using Air-coupled Ultrasonic Acoustic Emissions
… highly critical. This thesis presents a passive non-contact acoustic structural health monitoring approach using ultrasonic acoustic emissions (UAE) to detect certain defects on different structures, as well as, classifying the type of the defect on them. The acoustic emission signals used in …
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