Fatigue of Clip connectors for offshore drilling risers under biaxial tension

Vidit Gaur, Armel-Brice Mbiakop-Ngassa, Véronique Doquet, Eléonore Roguet, Emmanuel Persent, J.Y. Buffière, M. Brune, F. Morel, Y. Nadot
2014 MATEC Web of Conferences  
Drilling riser connectors designed by IFPEN undergo cyclic in-phase biaxial tension in their critical area. This type of loading was reproduced on steel tubular specimens loaded in cyclic tension and internal pressure. The fatigue lives were substantially reduced when the load biaxiality was increased from 0 to 0.4 and then further to 1, which was not captured by existing fatigue criteria. A deeper investigation is thus in progress. Emphasis is laid on the separate evaluation of mean stress and
more » ... of mean stress and biaxiality effects, often treated in the same way in existing criteria. The influence of load biaxiality on the resistance of the steel to fatigue-corrosion in seawater will also be investigated. This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
doi:10.1051/matecconf/20141204027 fatcat:hvt7dil33rexropwxepjfdl3am