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 18 of 18 for “"fatigue assessment"”.
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Fatigue Assessment for Failed Bridge Deck Closure Pour
… loss due to corrosion, but it was not clear if fatigue and strength failure of the reinforcing bars were also contributing factor in the closure pour failure. To study the problem four fatigue tests and five strength tests performed. The specimens included six slab strips cut from the I-81 …
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Development of a generalized fatigue assessment approach for steel castings.
… of this project was to develop a generalized fatigue assessment approach for steel castings for a range of internal casting quality details. In particular, this project examined the effect of quality details on the fatigue performance of steel castings using linear elastic fracture mechanics …
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Structural fatigue assessment and optimisation of offshore wind turbine jacket foundations.
… designs by enhancing structural integrity and fatigue life whilst reducing the mass. The research presents a comprehensive investigation of different parameters and design modifications that impact the design life of an existing jacket. An OC4 jacket foundation is employed, modelled in …
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Entwicklung eines Lebensdauersensors : Entwicklung und Anwendung eines neuartiges Konzepts zur Aufnahme von Bauteilbeanspruchungen für Betriebsfestigkeitsanalysen
… for long term data logging of chain loads. Fatigue assessment requires the determination of the curve for standing loads and the actual load range. As part of the accumulated damage assessment the damage arising during each individual load cycle is added up. When the total value reaches 1, …
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Assessing the Repeatability of Clinical Tests in People with and without Flexion-induced Neck Pain
… flexion, and a cervical extensor (CE) fatigue assessment. Afterwards, each participant spent 30 minutes using their personal smartphone for a series of predetermined tasks. During the 30 minutes, participants completed 5 visual analog scales (VAS) that helped categorize them into 2 …
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Avaliação de concentração de tensão em dutos danificados sob pressão interna após reparo
… thicknesses. These factors can be used in the fatigue assessment of damaged pipes, from the correction of S-N curves.
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Fatigue reliability assessment of co-located offshore wind and wave energy systems
… its service life. To assess this benefit, fatigue damage on an OWT is studied, while considering uncertainties in the wave climate and structural dynamics of the OWT, with and without the benefit of a sheltering WEC. This dissertation represents a collection of three papers that address …
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Análise de fadiga nas armaduras de tração de dutos flexíveis considerando efeitos da corrosão marinha
… tensile armours corrosion by seawater. Integrity assessment in this type of occurrence is usually limited to a reassessment of the fatigue life considering the new annulus conditions, possibly conservatively estimating some armour damage. The objective of this work is to develop a methodology …
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Towards a unified design-by-analysis solution to pressure vessel nozzle-shell junctions under combined loading
… detailed stress information is required as in a fatigue assessment. High-stress concentrations occur on the crotch corner for cylinder-cylinder joints, and it is possible to reach solutions for this problem by using both theoretical and numerical solutions. However, those approaches do not fully …
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MUSCLE FATIGUE ANALYSIS IN MINIMALLY INVASIVE SURGERY
… to excessive ergonomic risks including muscle fatigue that may lead to critical errors in surgical procedures. Therefore, detecting the vulnerable muscles and time-to-fatigue during MIS is of great importance in order to prevent these errors. In this research, different surgical skill and …
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Peridynamic analysis of fatigue crack growth in fillet welded joints
Fatigue assessment is one of the significant factors to be considered for a design life of structure and estimation of structural reliability during operation. Especially, for welded structures, various welding effects, such as stress concentration, residual stresses, weld geometry and weld …
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The effects of a high-carbohydrate, low-fat diet versus a low-carbohydrate, high-fat diet on dancer's performance
… diet for approximately one month. A Perceived Fatigue Assessment, dual energy x-ray absorptiometry, and exercise testing including a 30 second Wingate, lateral raises, calf raises, push-ups, and 90-second box jumps were performed at pre- and post-assessment for both diets. HRV was measured …
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Floating production storage offloading unit structural fatigue analysis
This thesis examines the fatigue behaviour of FPSO structures. It has been compiled as a result of theoretical, analytical and experimental study. The Finite Element approach has been utilized to analyse the FPSO's structure. It is intended that this particular work will enable further computer …
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Fatigue design of oil tankers: a design approach
… have exhibited a large number of structural fatigue cracks. These cracks can be attributed to the increase in use of high strength steel in tanker construction and to the harsh operating environment in the Gulf of Alaska. In response to the TAPS fatigue problem, this project examines the …
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Shear fatigue of adhesively bonded frictional interfaces in high-strength steel
… shear loading. Hybrid joints can have improved fatigue endurance as compared to welded connections of similar geometries but, thus far, adequate research data has not been available. A procedure, linking the interface characterisation and the stress analysis of the full-scale joint, is presented …
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Theoretical and experimental modelling of multiple site damage in plate components.
Fracture and fatigue assessment of structures weakened by multiple site damage (MSD), such as two or more interacting cracks, currently represents a challenging problem. The lifetime prediction of structural components with MSD is still largely based on 2D single crack solutions available in …
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HARMONIC AND RANDOM VIBRATION DURABILITY INVESTIGATION FOR SAC305 (Sn3.0Ag0.5Cu) SOLDER JOINT
… obtain quantitative insights into the vibration fatigue behavior of the SAC305 solder material. A time-domain approach was adopted to investigate the durability of solder interconnects under different kinds of vibration and quasi-static mechanical loading. First, the solder interconnects were …
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EFFECT OF WELD-TOE GRINDING ON FATIGUE LIFE BASED ON THEORY OF CRITICAL DISTANCE
This thesis aims to investigate the improved fatigue strength on three distinct types of welded joints: longitudinal attachment joints, cruciform joints, and butt joints through the numerical results of current research and statistical analysis of experimental datasets based on literature. This …