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- W2078525089 abstract "Abstract Fatigue data for repair welded offshore structures are still lacking. As acontribution to this subject, laboratory tests on the fatigue strength ofhyperbaric dry repair welded butt welds have been carried out. The tests werecarried out in air. The data thus represent the fatigue strength of repairwelds in structures operating in air or with cathodic protection. In order toobtain reference data the H16- process with optimized welding parameters wasapplied for repair welding. In forthcoming phases of the project the effect ofweld imperfections will be included as well as the influence of seawater. Thepartly large secondary bending stresses due to the angular distortion of thespecimens were calculated by means of a simple beam model. Residual tensilestresses between 30% and 60% of the yield stress were measured perpendicular tothe repair weld at the weld toe. Fatigue strength of initial and repair weldhave been found to be equivalent. With angular distortions within usual limitsthe repair weld can be ranked as a class 90 detail according to the IIW FatigueDesign Recommendations. Block program tests showed the validity of Miner'srule. Introduction Service loads acting on offshore structures are to a large extent fatigueloads. With the increasing age of many structures and a tendency towards anextension of service life the fatigue strength of repair welds requires specialattention. In the investigation described in this paper the repair of a surfacecrack at the toe of a butt weld under hyperbaric conditions was simulated andthe fatigue properties of the repaired weld have been studied. This study ispart of a research project Damage investigation and prevention in underwaterstructures. The project is supported by Deutsche Forschungsgemeinschaft (DFG). Full details of the study are given in 1. While optimized repair weldingparameters were used in the present study and the fatigue tests were carriedout in air, the effect of weld imperfections as well as of corrosive seawaterenvironment will be included in further stages of the project." @default.
- W2078525089 created "2016-06-24" @default.
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- W2078525089 date "1993-05-03" @default.
- W2078525089 modified "2023-10-17" @default.
- W2078525089 title "Fatigue Properties of Hyperbaric Dry Repair Welds" @default.
- W2078525089 doi "https://doi.org/10.4043/7279-ms" @default.
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