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Influence of relative density on quasi-static and fatigue failure of lattice structures in Ti6Al4V produced by laser powder bed fusion KU Leuven
Lattice structures produced by additive manufacturing have been increasingly studied in recent years due to their potential to tailor prescribed mechanical properties. Their mechanical performances are influenced by several factors such as unit cell topology, parent material and relative density. In this study, static and dynamic behaviors of Ti6Al4V lattice structures were analyzed focusing on the criteria used to define the failure of ...
Quantifying the effect of low-frequency fatigue dynamics on offshore wind turbine foundations: a comparative study Vrije Universiteit Brussel
Offshore wind turbine support structures are fatigue-driven designs subjected to a wide variety of cyclic loads from wind, waves, and turbine controls. While most wind turbine loads and metocean data are collected at short-term 10-minute intervals, some of the largest fatigue cycles have periods over one day. Therefore, these low-frequency fatigue dynamics (LFFD) are not fully considered when working with the industry-standard short-term window. ...
Numerical study on the effect of pitting corrosion on the fatigue strength degradation of offshore wind turbine substructures using a short crack model Ghent University
Steel support structures of offshore wind turbines (jackets and monopiles) undergo both fatigue and corrosion damage, impacting their lifetime. Due to the time‐variant uncertainties associated with environmental and mechanical loads, having reliable models that allow to predict the degradation due to corrosion and fatigue is necessary to accurately assess the structural integrity and to support decision making. Three Belgian universities (UGent, ...
On the fatigue behavior of duplex and high-strength welded cruciform joints KU Leuven
This paper presents outcome of a research which investigates the fatigue behaviour of duplex stainless steel grade (EN 1.4162) via cyclic tests on welded cruciform joints and base plates. A database of experimental tests for similar high-strength steel details was also collated from the literature. The obtained experimental S-N curve was then compared to the current European design ones and re-evaluated according to the hot spot stress method. A ...
Prediction of remaining fatigue life of welded joints in wind turbine support structures considering strain measurement and a joint distribution of oceanographic data Vrije Universiteit Brussel
Reassessing the remaining fatigue life of the wind turbine support structures becomes more and more crucial for operation, maintenance, and life extension when they are reaching the end of their design service life. By using measured oceanographic and strain data, each year, remaining fatigue life can be updated to adapt the operation to real loading conditions. Previous works have not put attention to address the complexity of offshore loading ...
Effect of Heat Treatments on Fatigue Properties of Ti–6Al–4V and 316L Produced by Laser Powder Bed Fusion in As-Built Surface Condition KU Leuven
Over the last decade, additive manufacturing (AM) techniques have been expanding rapidly due to their ability to produce complex geometries with an efficient use of material. In order to design reliable AM parts, the mechanical properties resulting from the manufacturing process need to be understood. The present study investigates the fatigue of AM Ti–6Al–4V and 316L. Miniaturized Ti–6Al–4V and 316L specimens were manufactured using laser ...
A comparative study on fatigue assessment of orthotropic steel decks based on long-term WIM data Ghent University
Fatigue is the problem that constantly bothers the durability and serviceability of orthotropic steel decks. As fatigue cracks always emerge at the welded joints of orthotropic steel decks, the accuracy and feasibility of fatigue assessment of welded details on this type of structure should be further evaluated. The regular way based on S-N curves should be specifically discussed, since it is proven to be inconsistent with experiments and ...
Semiorthogonal decompositions of the categories of equivariant coherent sheaves for some reflection groups Hasselt University
We consider the derived category D-G(b)(V) of coherent sheaves on a complex vector space V equivariant with respect to an action of a finite reflection group G. In some cases, including Weyl groups of type A, B, G(2), F-4, as well as the groups G(m, 1, n) = (mu(m))(n) (sic) S-n, we construct a semiorthogonal decomposition of this category, indexed by the conjugacy classes of G. The pieces of this decompositions are equivalent to the derived ...
A non-linear model for corrosion fatigue lifetime based on continuum damage mechanics Ghent University
Many structures, such as oil platforms and wind turbines, are built in the marine environment. These structures do not merely suffer from variable cyclic loading due to wind, waves and current, but also from corrosion. Their interaction can give rise to corrosion fatigue, thus reducing the service life and integrity of the structure. The research community witnesses a challenge to identify damage mechanisms of combined fatigue loading and ...