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- W2102892153 abstract "A comparative study of two different hydro power turbine designs, made by Remote Hydrolight (RHL) was conducted. The shaft of the first design has suffered from fatigue failures and a bushing was introduced to solve the problem, giving the second design. In this thesis, flow calculations, finite element analysis (FEA), inspection of micro structures and the weld were carried out, along with fatigue life calculations. This was done for both designs to compare the existing fatigue data with the findings. It was found that the introduction of the bushing is generally beneficial. The stresses at the weld toe previously subject to fatigue fracture were reduced by at least 52,5%. Two kinds of laboratory activities were carried out in this thesis. Firstly, a metallurgic analysis was performed and unveiled flaws on and in the weld. Micro cracks, cavities and general porosity suggested that the welding procedure also needs to be revised. Such cavities, especially if occurring at the weld toe of the outer rotor disk, may lead to fatigue failure, despite the introduction of the bushing. In addition, a micro Vickers hardness test was conducted. The tests showed that a range of materials are used for making the turbine, with the shaft material having the highest tensile strength. There exists too few fatigue data?s for establishing a fatigue stress limit for the different components. Based on the data received, no reliable fatigue life for the modified turbine with bushing can be calculated." @default.
- W2102892153 created "2016-06-24" @default.
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- W2102892153 date "2013-01-01" @default.
- W2102892153 modified "2023-09-24" @default.
- W2102892153 title "Assessment of Structural Integrity and Potential Improvements of Micro Hydropower Turbine" @default.
- W2102892153 hasPublicationYear "2013" @default.
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