For offshore pipe laying purposes, an investigation was made on the friction behaviour of several composite materials. The best composite material was selected in terms of its static and dynamic friction and shear behaviour.
Cost reduction is an important topic in the offshore wind sector. However, in view of the move to larger turbine sizes and deeper waters, costs of foundation structures will rise. It is now possible to test tubular joints having the dimensions of offshore wind turbine jacket structures at millions of cycles within a week and with low energy consumption.
As threaded connections are submitted to variable loading they can suffer from fatigue. The critical locations for fatigue were determined and confirmed by experiments. The large scale resonant bending test proved to be valuable test equipment.