![]() Application of a fracture mechanics approach may at least partly bypass the difficulties and restrictions. ![]() The generation of fatigue data for the longer fatigue life of large-scale components is especially troublesome, time consuming and expensive. Part 3: Fatigue life estimation on a fracture mechanics approach. ![]() To gain better knowledge of the influence of root defects on the fatigue behaviour tests have been carried out on butt-welded tubular joints under axial loading with a constant amplitude. In the construction of offshore platforms one-side welding is often unavoid-able and so are root defects. Part 2: Fatigue behaviour of butt-welded tubular connections with root defects. Since the plate thickness applied in offshore structures tends to increase with the dimensions of those structures, fatigue research is carried out on thick plates. Earlier fatigue research up to a plate thickness of 76 mm showed that an increase of the plate thickness has a decreasing effect on the fatigue per-formance. Part 1: Fatigue behaviour of thick plates with and without attachments. ![]() So the final report includes three parts. In this research programme three different aspects of the fatigue behaviour of welded joints are investigated.
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