A5080968047- Microstructure and mechanical properties
- Microstructure and Mechanical Properties of Steels
- Mechanical Behavior of Composites
- Metal Alloys Wear and Properties
- Metallurgy and Material Forming
- Aluminum Alloy Microstructure Properties
- Fatigue and fracture mechanics
- Advanced Materials Characterization Techniques
- Metal Forming Simulation Techniques
- Metal and Thin Film Mechanics
- Icing and De-icing Technologies
- Optical measurement and interference techniques
- Diamond and Carbon-based Materials Research
- Non-Destructive Testing Techniques
- Fullerene Chemistry and Applications
- High-Velocity Impact and Material Behavior
- Additive Manufacturing and 3D Printing Technologies
- Advanced Surface Polishing Techniques
- Aerosol Filtration and Electrostatic Precipitation
- Material Properties and Applications
- Particle Dynamics in Fluid Flows
- Mechanical stress and fatigue analysis
- Welding Techniques and Residual Stresses
- Railway Engineering and Dynamics
- X-ray Diffraction in Crystallography
Technical University of Denmark
2013-2024
Danish Energy Association
2017
Nordic Laboratory for Luminescence Dating
1999-2007
Centre for Sustainable Energy
2005
European Synchrotron Radiation Facility
2004
A fast and non-destructive method for generating three-dimensional maps of the grain boundaries in undeformed polycrystals is presented. The relies on tracking micro-focused high-energy X-rays. It verified by comparing an electron microscopy map orientations 2.5 × mm surface aluminium polycrystal with data produced at 3DXRD microscope European Synchrotron Radiation Facility. average difference boundary position between two techniques 26 µm, comparable spatial resolution microscope. As...
We observed the in situ growth of a grain during recrystallization bulk deformed sample. used three-dimensional x-ray diffraction microscope located at European Synchrotron Radiation Facility Grenoble, France. The results showed very heterogeneous pattern, contradicting classical assumption smooth and spherical new grains recrystallization. This type measurement opens up possibility obtaining experimental data on scientific topics that before could only be analyzed theoretically basis...
Abstract Micromechanisms of leading edge erosion wind turbine blades are studied with the use X‐ray tomography and computational micromechanics simulations. Computational unit cell micromechanical models coatings taking into account their microscale nanoscale structures have been developed compared microscopy studies. It was observed that heterogeneities, particles, voids in protective critical effect on crack initiation under multiple liquid impact. The damage criterion for formation...
This work investigates the effect of manufacturing defects induced by thread rolling on high-cycle fatigue life M30 class 10.9 stud bolts. High-cycle tests two batches nominally identical bolts show significant differences in performance between batches. Scanning electron microscopy characterisation form rolling-induced microcracks root reveals a clear correlation defect size and investigated It is demonstrated that initial cracks present threads have considerable slope S–N curves. Numerical...
Abstract Leading edge erosion on a wind turbine blade from Vindeby offshore farm is characterized by X‐ray tomography, and air bubbles within the top coat are observed. Similar coating systems with almost without tested R&D Test Systems style whirling arm rain tester (RET) found to have different V–N curves. In general, slope of two curves was comparable. However, absolute performance value RET differs significantly up 2.6 times advantage less bubbles. A micromechanical model system that...
Possibilities of the development new anti-erosion coatings for wind turbine blade surface protection on basis nanoengineered polymers are explored. Coatings with graphene and hybrid nanoreinforcements tested their performance, using single point impact fatigue testing (SPIFT) methodology. It is demonstrated that (graphene/silica) reinforced polymer can provide better erosion lifetimes up to 13 times longer than non-reinforced polyurethanes. Thermal effects energy dissipation during repeated...
Traditionally, depth resolution in diffraction experiments is obtained by inserting pinholes both the incoming and diffracted beam. For materials science investigations of local strain texture properties this leads to very slow data-acquisition rates, especially when characterization performed on level individual grains. To circumvent problem a conical slit has been manufactured wire-electrodischarge machining. The six 25 µm-thick conically shaped openings matching Debye–Scherrer cones from...
Biomass gasification experiments were carried out in a bench scale entrained flow reactor, and the produced solid particles collected by cyclone metal filter for subsequent characterization. During wood gasification, major part of material is soot. Scanning electron microscopy (SEM) images coupled with energy dispersive spectroscopy (EDS) show agglomerated nanosize spherical soot (<100 nm) that are very rich carbon. In comparison to content sample from straw quite low, while contents KCl...
Maintenance and repair of wind turbines contribute to the higher costs energy. In this paper, various technologies structural damaged broken turbine blades are compared. The composite plates, mimicking blade parts, were repaired, using available curing bonding technologies. Technologies with hand layup lamination, vacuum infusion, ultraviolet high temperature thermal repaired samples tested under tensile static fatigue tests, subject microscopic X-ray investigations. It was observed that...
Large-scale components such as hubs in wind turbines are often made of cast iron to minimize the production costs. One common challenges casting process large-scale is manufacturing defects. However, repair welding will induce residual stress which can initiate cracks repaired structure, especially since not tough steel. The current study addresses developing a thermo-mechanical model weld validated with experiments predict thermal and stresses identify critical locations for crack...