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 10 of 10 for “"Thermal ageing"”.
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Empirical Multiphase Model for Strength Evolution of High-Chromium Steel Alloys
… complex non-monotonic strength evolution during thermal ageing at elevated temperatures, limiting predictive capability for long-term component life assessment. This dissertation develops and validates the METALS (Microstructure Evolution and Thermal Ageing-Linked Strength) model. An empirical …
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Ageing Assessment of Power Transformer Kraft Paper Insulation Using Optical Speckle
… aged kraft paper with four different levels of thermal ageing using a potentially fast, simple, and inexpensive optical setup based on optical speckle is the main subject of this thesis. Speckle interference patterns from a laser diode source have been captured by a CCD camera. Classification …
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Nondestructive evaluation of a high temperature ceramic matrix composite material
… nondestructive testing methods used to detect thermally induced changes in the SiC/SiC composite were evaluated. All of the NDT techniques, except film X-ray radiography, were sensitive to changes in the ceramic matrix composite (CMC) caused by thermal ageing. Surface and sub-surface scanning …
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An Evaluation of Tellurium Compounds as Polymer Stabilisers
… compounds on PVC during processing, thermal ageing and UV irradiation was examined by measuring unsaturation, colour and carbonyl formation. These compounds were found to be effective stabilisers during processing and thermal oxidation but they do not lead to good UV stability during …
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Effects of sterilization, conditioning, and thermal aging on the retention of zirconia hybrid abutments
… of sterilisation, conditioning methods, and thermal ageing on the retention strength of two-piece zirconia abutments. A total of 128 stock zirconia abutments were divided into 4 groups, each including 32 abutments. The groups were categorized based on the conditioning parameters used: …
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Reducing the risk of open display: optimising the preventive conservation of historic silks
… were the study’s focus. Year long accelerated ageing experiments have demonstrated that although the inclusion of UV radiation during light ageing increased the rate of deterioration, light ageing caused small changes to silk. Thermal ageing with different humidity levels demonstrated …
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Material selection and manufacture for a polymer heart valve application
… were characterised for their structural, thermal and mechanical properties before and after accelerated ageing by oxidation and hydrolysis. Thermal ageing in air was also studied. Collection of this qualitative and quantitative information builds a useful database of results from which to …
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Operation of induction machines in the presence of unbalanced supplies
… with over or undervoltages, electrical and thermal models were developed to predict the temperature. The electrical model was based on the positive and negative sequence equivalent circuits. The thermal model used, separated stator and rotor thermal circuits. The thermal parameters were …
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Wollprodukte im Wohnbereich : Untersuchungen zur Abschätzung des allergenen Potentials
… wool fibres. Fibrillates wool fibres were found. Thermal influence is important by insulating material and beddings and is leading only to small changes on the wool fibre surface. By insulating material humidity could not provoke the building of mildew. Mite contamination was founded by several …
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Ageing Mechanisms in Automotive Catalysts
… and expensive nature of on-road and on-engine ageing, laboratory ageing and testing methods are becoming increasingly important, as well as mathematical catalyst simulation models. With the regulations concerning automotive emissions becoming more and more stringent it is important that these …