The Experts below are selected from a list of 321486 Experts worldwide ranked by ideXlab platform
Joachim L Grenestedt - One of the best experts on this subject based on the ideXlab platform.
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steel truss composite skin hybrid ship hull part ii manufacturing and sagging testing
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: William J Maroun, Jun Cao, Joachim L GrenestedtAbstract:A six meter subscale steel truss/composite skin hybrid ship hull model was developed based on an optimized Design of a full scale model. The subscale model was finite element analyzed, manufactured and tested under sagging Loads. It was made of a welded stainless steel truss to which 60 composite sandwich panels were bonded. The model was Loaded to 36% above the Design Load, at which point there was substantial yielding and residual deformation of the steel truss. However, there was no indication of damage in any of the composite sandwich panels, nor in the bonds between the panels and the steel truss.
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testing and analysis of a 6 m steel truss composite skin hybrid ship hull model
Marine Structures, 2006Co-Authors: Jun Cao, Joachim L Grenestedt, William J MarounAbstract:A hybrid ship hull made of a steel truss and composite sandwich skins was investigated experimentally and numerically. A 6-m model was tested under hogging Loads, after having previous been subjected to sagging Loads. All Loads were introduced as shear through brackets welded to bulkheads. The model was Loaded to the Design Load, at which point there was plastic yielding of the steel truss. However, there was no indication of failure in any of the composite sandwich panels, nor in the adhesive bonds between the panels and the steel truss. The steel truss started to yield at lower strains than expected, a fact which was elucidated by manufacturing and testing subcomponents of the steel truss. Nonlinear elastic-plastic finite element analyses were performed on the complete hull. Results from the numerical analyses were compared with data from both sagging and hogging tests and good correlation was found.
William J Maroun - One of the best experts on this subject based on the ideXlab platform.
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steel truss composite skin hybrid ship hull part ii manufacturing and sagging testing
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: William J Maroun, Jun Cao, Joachim L GrenestedtAbstract:A six meter subscale steel truss/composite skin hybrid ship hull model was developed based on an optimized Design of a full scale model. The subscale model was finite element analyzed, manufactured and tested under sagging Loads. It was made of a welded stainless steel truss to which 60 composite sandwich panels were bonded. The model was Loaded to 36% above the Design Load, at which point there was substantial yielding and residual deformation of the steel truss. However, there was no indication of damage in any of the composite sandwich panels, nor in the bonds between the panels and the steel truss.
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testing and analysis of a 6 m steel truss composite skin hybrid ship hull model
Marine Structures, 2006Co-Authors: Jun Cao, Joachim L Grenestedt, William J MarounAbstract:A hybrid ship hull made of a steel truss and composite sandwich skins was investigated experimentally and numerically. A 6-m model was tested under hogging Loads, after having previous been subjected to sagging Loads. All Loads were introduced as shear through brackets welded to bulkheads. The model was Loaded to the Design Load, at which point there was plastic yielding of the steel truss. However, there was no indication of failure in any of the composite sandwich panels, nor in the adhesive bonds between the panels and the steel truss. The steel truss started to yield at lower strains than expected, a fact which was elucidated by manufacturing and testing subcomponents of the steel truss. Nonlinear elastic-plastic finite element analyses were performed on the complete hull. Results from the numerical analyses were compared with data from both sagging and hogging tests and good correlation was found.
Joey Velarde - One of the best experts on this subject based on the ideXlab platform.
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global sensitivity analysis of offshore wind turbine foundation fatigue Loads
Renewable Energy, 2019Co-Authors: Joey Velarde, Claus Kramhoft, John Dalsgaard SorensenAbstract:Abstract The Design and analysis of offshore wind turbine foundations are traditionally based on deterministic time-domain simulations of a numerical model. The wind turbine, support structure and environmental conditions are represented by a large number of input parameters, whose uncertainties are accounted by applying partial safety factors. In this paper, the sensitivity of fatigue Loads with respect to primary structural, geotechnical and metocean parameters are investigated for a 5 MW offshore wind turbine installed on a gravity based foundation. Linear regression of Monte Carlo simulations and Morris screening are performed for three Design Load cases. Results show that parameter significance rankings vary according to which Design Load case is considered. In general, uncertainties in the fatigue Loads are highly influenced by turbulence intensity and wave Load uncertainties, while uncertainties in soil property suggest significant nonlinear or interactive effects. This work provides insights to foundation Designers and wind turbine manufacturers on which parameters must be assessed in more detail in order to reduce uncertainties in Load prediction.
Jun Cao - One of the best experts on this subject based on the ideXlab platform.
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steel truss composite skin hybrid ship hull part ii manufacturing and sagging testing
Composites Part A-applied Science and Manufacturing, 2007Co-Authors: William J Maroun, Jun Cao, Joachim L GrenestedtAbstract:A six meter subscale steel truss/composite skin hybrid ship hull model was developed based on an optimized Design of a full scale model. The subscale model was finite element analyzed, manufactured and tested under sagging Loads. It was made of a welded stainless steel truss to which 60 composite sandwich panels were bonded. The model was Loaded to 36% above the Design Load, at which point there was substantial yielding and residual deformation of the steel truss. However, there was no indication of damage in any of the composite sandwich panels, nor in the bonds between the panels and the steel truss.
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testing and analysis of a 6 m steel truss composite skin hybrid ship hull model
Marine Structures, 2006Co-Authors: Jun Cao, Joachim L Grenestedt, William J MarounAbstract:A hybrid ship hull made of a steel truss and composite sandwich skins was investigated experimentally and numerically. A 6-m model was tested under hogging Loads, after having previous been subjected to sagging Loads. All Loads were introduced as shear through brackets welded to bulkheads. The model was Loaded to the Design Load, at which point there was plastic yielding of the steel truss. However, there was no indication of failure in any of the composite sandwich panels, nor in the adhesive bonds between the panels and the steel truss. The steel truss started to yield at lower strains than expected, a fact which was elucidated by manufacturing and testing subcomponents of the steel truss. Nonlinear elastic-plastic finite element analyses were performed on the complete hull. Results from the numerical analyses were compared with data from both sagging and hogging tests and good correlation was found.
Kim Branner - One of the best experts on this subject based on the ideXlab platform.
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condensation of long term wave climates for the fatigue Design of hydrodynamically sensitive offshore wind turbine support structures
Ships and Offshore Structures, 2016Co-Authors: Patrik Passon, Kim BrannerAbstract:Cost-efficient and reliable fatigue Designs of offshore wind turbine support structures require an adequate representation of the site-specific wind–wave joint distribution. Establishment of this wind–wave joint distribution for Design Load calculation purposes requires typically a correlation of the marginal wind and wave distribution. This is achieved by condensation of the site-specific wave climate in terms of wave period or wave height lumping, subsequently used as input for a correlation with the corresponding wind climate. The quality of this resulting wind–wave correlation is especially important for hydrodynamically sensitive structures since the applied met-ocean parameters have a non-linear influence on calculated fatigue Design Loads. The present article introduces a new wave lumping method for condensation of the wave climate. The novelty is predominantly based on refined equivalence criterions for fatigue Loads aiming at preservation of the fatigue damage distribution over either the wave he...
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the effect of delaminations on local buckling in wind turbine blades
Renewable Energy, 2016Co-Authors: Philipp Ulrich Haselbach, Robert Bitsche, Kim BrannerAbstract:Abstract In this article the effect of delaminations on the Load carrying capacity of a large wind turbine blade is studied numerically. For this purpose an 8.65 m long blade section with different initial delaminations in the main spar was subjected to a flapwise dominated bending moment. The model was setup in Abaqus and cohesive elements were chosen for modelling delamination growth. For initial delaminations with a width of 30–50% of the cap width the study showed that delamination close to the surface started to grow in Load ranges of normal operation conditions and led to local buckling modes. The local buckling caused high strains and stresses in the surrounding of the delamination, which exceeded the material Design properties and therefore should be considered as dangerous. Delaminations placed near the mid-surface of the cap did not have a significant effect on the blade response under normal operation conditions. In the simulations the static Load exceeded the Design Load by more than 40% before delamination growth or cap buckling occurred. It could be concluded that delamination induced near-surface buckling modes have to be considered critical due to an onset of local sublaminate buckling below the Design Load level.
