On the assessment of multiaxial fatigue resistance of welded steel joints in marine structures when exposed to non-proportional constant amplitude loading

Structural geometry and stochastic loads such as swell and wind seas can typically induce multiaxial stress states in welded details of marine structures. It is known that such complex time varying stress states determine the fatigue resistance of welded steel joints. Therefore, it is of importance to account for them in fatigue lifetime...

Validation of the corrected Dang Van multiaxial fatigue criterion applied to turret bearings of FPSO offloading buoys

In engineering practice, multiaxial fatigue analyses are often avoided due to their complexity and computational intensity. However, damages have been encountered in turret bearings of Floating Production Storage and Offloading vessel (FPSO) offloading buoys which were likely caused by multiaxial fatigue. The Dang Van criterion has often been...

Comparative Fatigue Analysis of a Tidal Turbines Support Structure

The Effect of Braces in an Asymmetric Semi-Submersible Hull: A Structural Weight and Multiaxial Fatigue Assessment

Heerema Marine Contractors is looking into a new semi-submersible crane vessel concept with an asymmetric hull. The necessity of braces (connections between the portside and starboard hulls) for this vessel is questioned, based on earlier vessel developments and operational experience. This study addresses the influence of braces on the...

Multiaxial fatigue: the influence of principal stress directions on the fatigue assessment of a stinger structure

The Allseas Group S.A. has made a name for itself in the field of offshore pipelaying and subsea construction by staying innovative. The company has six specialized vessels operating worldwide and the biggest vessel in the world is almost ready for operations. One of the company vessels is the Solitaire and lays pipe using the S-lay installation...

Comparative analysis of common practice fatigue versus multiaxial fatigue applied to a floating unit for wind turbine installation

The objective of the thesis is to compare a common practice fatigue analysis with a multiaxial fatigue analysis for an installation unit that can install large gravity base offshore wind turbines (up to 10MW) in its entirety. From this comparison the effect of the phase relation between normal and shear stress on the fatigue damage is analyzed.