By G. Maier (eds.)
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Extra resources for Case Histories in Offshore Engineering
S . c. 0 0 6 12 18 24 30 36 42 Time (months) Fig. rth histories in brace I:6 over its service life. 34 T. Moan Detection of cracks by inspection . The structure of Alexander L. Kielland had been inspected 11 II during fabrication and every year in cperation acoording to the requirements of the classification society. The inspection in the yard in principle shoold ooncem the catplete structure, i. e. at least a visual examination of all weldments should be aCCCJil>lished. np:>rtance of the actual area - and to inadequate thorooghness of the the required inspections.
S/N analysis of fatigue cracks at the hydrcphone support in brace D6. As shONn in Table 4 there are several potential locations of fatigue cracks along the fillet welds at the hydrophone support. For each location stress oamponents oontributing to crack cpening are oonsidered when the Equivalent (von Mises) stress or the oorresponding stress ooncentration factor, is determined. In the particular case of partial cracking between the hydrophone support and the brace D6, the elastic stress is wi th crack fronts at the posi tions e=O 0and 180 °, actually infinitely large at these positions.
E. at least a visual examination of all weldments should be aCCCJil>lished. np:>rtance of the actual area - and to inadequate thorooghness of the the required inspections. mich were mt inspected. Only the rnajor inspection every foorth year seemed to have a potential of detecting cracks, if looked for. But it is mt even likely that the hydrcphone support area \\Ollld have been included in the rnajor inspection of Alexander L. Kielland 11 11 that was due, because there was no evidence regarding predicted crack praneness or cracks experienced before the Alexander L.