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 30 for “"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 the …
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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.
… 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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Impact Simulation and Analysis of Sandwich Structures
… factors should be considered. Secondly, it is a destructive test and the test subject may be damaged during the test. On the other hand, computer simulation based on a finite element code has advantages considering both the cost factor and technical issues associated with real tests.</p> <p>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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Microprocessor-based system for the detection and characterization of acoustic emissions for materials testing
… time. The AEDCS is designed to be used in the AE testing of materials. It is well-suited for non-destructive applications that produce a relatively low AE count rate, such as AE monitoring of wooden structures. The AEDCS is also capable of recording AE event characteristics in destructive test …
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Interaction of stainless steel threaded fasteners with stainless steel locking inserts
… on high-vacuum environment applications. Nondestructive and destructive test methods were used in conjunction with information gathered from investigation with a scanning electron microscope coupled with an Energy Dispersive X-ray Spectrometer. Since high-vacuum environment applications …
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Statistical methods applied to acousto-ultrasonic technique
… 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, has …
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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
… 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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Properties and performance of a ceramic composite component
… of a tubular, ceramic composite component. Eight test specimens were fabricated using an injection molding process with a borosilicate glass matrix reinforced with chopped graphite fibers. These specimens were then tested under quasi-static and cyclic loading at room temperature. Due to the …
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Detection of multiple defects based on structural health monitoring of pipeline using guided waves technique
… 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 damage …
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Accelerated thermal degradation testing of GAN HEMTs under high-temperature stress
… operating conditions. Accelerated degradation testing is conducted by heating the devices within a thermal chamber at 150 °C under high-current stress. An external circuit is connected to the switch node of the HEMT device to record on-state drain-source voltage, VDS (on), across a shunt …
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Terahertz imaging and quantum cascade laser based devices
… 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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Vibrational methods applied to NDT testing and fluid density measurement
A system for the NDI' testing of the integrity of conposite materials and of adhesive bonds has been developed to meet industrial requirements. The vibration techniques used were found to be applicable to the development of fluid measuring transducers. The vibrational spectra of thin rectangular …
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