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 “"accelerated test"”.
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A review and development of accelerated test methods for anti-corrosive organic coatings
… environmentally friendly coatings. The immersion test has also incorporated a temperature cycle which proved effective at separating ‘good’ coatings within a short timeframe. Results showed good correlation between ENM and salt spray testing. Work is also reported which was done with the aim of …
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EFFECT OF MECHANICAL VIBRATION ON PLATINUM PARTICLE AGGLOMERATION AND GROWTH IN PROTON EXCHANGE MEMBRANE FUEL CELL CATALYST LAYER
… mechanical vibration on the catalyst layer an accelerated test with potential cycling was specially designed to simulate a typical vehicle driving condition. The length of the accelerated test was designed to be 300 hour with potential cycling comprised of idle running, constant load, triangle …
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Lifetime Assessment and Real-Time Reliability Evaluation of SIC MOSFETs in Power Converters
… models are developed using Power Cycling Tests and a newly proposed Inverter-like Accelerated Test (IAT) that replicates real converter stresses. To ensure sustained reliability under varying operating conditions, a Reliability-Centric Control (RCC) strategy is introduced, which …
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Development of vibration loading profiles for accelerated durability tests of ground vehicles
The accelerated durability test is an important part for design and manufacturing ground vehicles. It consists of test designed to quantify the life characteristics of a ground vehicle component under normal use conditions by testing the unit at higher stress levels to accelerate the occurrence of …
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The wear of materials in hydraulic transport pipelines
… to the small amounts of material lost in in-situ tests, requiring in many cases in excess of 1000 hours testing, an accelerated test procedure is necessary. This work introduces an accelerated method of evaluating materials under simulated pipeline wear conditions. The solids in the slurry and the …
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Reliability and Lifetime Assessment and Enhancement of SIC MOSFETs in an H-ANPC Inverter
… stress conditions, achieved through various Accelerated Tests (ATs). A Hybrid Active Neutral Point Clamped (H-ANPC) inverter, integrating Si IGBTs and SiC MOSFETs, is selected to develop lifetime models and strategies for reliability enhancement. The study begins with a Power Cycling Test …
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Using lithium compounds as an admixture in new concrete and as a post-treatment for existing concrete affected by alkali-silica reaction
… of the project is the assessment of the current test methods available for testing the efficacy of lithium nitrate as an admixture. The two test methods used were ASTM C 1260 and ASTM C 1293 and their modifications, and in addition, exposure blocks were cast to simulate field behavior. After an …
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Predicción del tiempo de vida de las lámparas fluorescentes. Aplicación a usos fotovoltáicos
… different on and off times in the durability test. Further, the relationship between conventional and accelerated durability test characterized by different fluorescent lamp continuous operation and off times are analyzed, revealing that the accelerated test are ñor always shorter. Based on …
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An experimental approach into the degradation of wind turbine blade coating systems due to rain and weathering
… in wind turbine blade coating system assessment. Accelerated test were used to mimic the effects of years of in-situ rain erosion and weathering on test specimens. A suite of analytical laboratory tools was used to measure the effects of rain erosion and weathering, both individually and as a …
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Reliability Assessment of Rolling Piston Rotary Type Compressos
… the measurement of wear on the roller under accelerated test conditions, and predict the effect of wear on the degradation of compressor performance. In order to be able to estimate the amount of wear under different operating pressures, a correlation between operating pressures, amount of …
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Particle Size, Gas Temperature, and Impingement Cooling Effects on High Pressure Turbine Deposition in Land Based Gas Turbines from Various Synfuels
Four series of tests were performed in an accelerated deposition test facility to study the independent effects of particle size, gas temperature, and metal temperature on ash deposits from two candidate power turbine synfuels. The facility matches the gas temperature and velocity of modern first …
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The notched coating adhesion specimen: a fracture test for coatings and accelerated screening test for adhesion
A simple adhesion test method is proposed to provide estimates of the debond toughness of adhesive bonds. Notched coating adhesion (NCA) specimens consist of single substrates coated with thin layers of adhesive. The coating is notched to induce initial debonds, and the specimen is then loaded in a …
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Evaluating abrasive wear resistance of extruder tooling materials using the dry sand rubber wheel abrasion test
… if the ASTM G65 dry sand rubber wheel abrasion test could be used as an accelerated test to evaluate candidate materials. Samples were tested in the heat treated condition and after surface modification by plasma ion nitriding. The range of materials tested included medium and high alloy steels …
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Design and implementation of an apparatus for hydrodynamic and fatigue testing of prosthetic aortic valves
… the market they are required to undergo rigorous testing to verify performance and product life expectancy. Performance testing is done in a hydrodynamic test apparatus and life expectancy verified in an accelerated test apparatus. The Cardiology Department at Tygerberg Hospital has proposed a …
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Lifetime Estimation for Ductile Failure in Semicrystalline Polymer Pipes
… experimental and analytical framework for accelerated lifetime estimates of semi-crystalline plastic pipes which is sensitive to changes in structure, orientation, and morphology introduced by processing conditions. To accomplish this task, high-density polyethylene (HDPE) is chosen as the …
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Statistical Predictions Based on Accelerated Degradation Data and Spatial Count Data
… is used to estimate parameters based on the accelerated test data from laboratory. The developed model is then extended to allow for time-varying covariates and is used to predict outdoor degradation where the explanatory variables are time-varying. Chapter 3 introduces a class of models for …
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Development of a Mechanistic-Based Approach to Evaluate Critical Conditions of Hot Mix Asphalt Mixtures
… mixtures using the repeated load triaxial (RLT) test at field representative testing conditions to determine the critical temperature of the HMA beyond which the mixture becomes unstable. An HMA was considered appropriate for a specific project location if the determined critical temperature was …
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Insights Into Non-Uniform Copper and Brass Corrosion in Potable Water Systems
… pitting corrosion, it was found that forensic testing (i.e., in pipe-loops) is the only investigative technique that can closely mimic conditions found in real water systems and produce unambiguous results; and, if used in combination with electrochemical techniques, it may also provide some …
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The effects of chloride-based deicing chemicals on degradation of portland cement mortars with alkali reactive aggregate
… on the alkali silica reaction (ASR) using accelerated test methods (i.e. the test was performed at high temperature (80 °C) as per modified ASTM C1260). The second phase focused on the effect of deicers on the ASR under prolonged exposure to freezing and thawing (F/T) and wetting and drying …
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