Ingenieurwissenschaften und zugeordnete Tätigkeiten
Filtern
Erscheinungsjahr
- 2017 (276) (entfernen)
Dokumenttyp
- Vortrag (276) (entfernen)
Sprache
- Englisch (276) (entfernen)
Referierte Publikation
- nein (276)
Schlagworte
- NIR (11)
- Fluorescence (10)
- Integrating sphere spectroscopy (10)
- Nanoparticle (9)
- Quantum yield (8)
- Upconversion (8)
- IR (7)
- Residual stresses (7)
- Wear (7)
- Absolute fluorometry (6)
- Additive manufacturing (6)
- Coarsening (6)
- Fracture mechanics (6)
- Friction (6)
- Additive Manufacturing (5)
- Broadband dielectric spectroscopy (5)
- Corrosion (5)
- Degradation (5)
- Fire (5)
- High-strength steels (5)
- Microstructure (5)
- Process parameters (5)
- S-phase (5)
- Stainless steel (5)
- Steel (5)
- Surface chemistry (5)
- Brillouin (4)
- Ceramics (4)
- Composite (4)
- Computed tomography (4)
- Deactivation pathways (4)
- Distributed sensing (4)
- Explosives (4)
- Explosivstoffe (4)
- GFRP (4)
- GMA Welding (4)
- Heat treatment (4)
- Hydrogen (4)
- Laser-induced periodic surface structures (LIPSS) (4)
- MIC (4)
- Nanoparticles (4)
- Polymer optical fibre (4)
- Reference material (4)
- Reliability (4)
- Restraint (4)
- Size (4)
- Superalloy (4)
- 2,6-diaminopyridine (3)
- Absolute fluorescence quantum yield (3)
- Active thermography (3)
- Ageing (3)
- Biodiesel (3)
- Biomimetics (3)
- Building Materials (3)
- CFRP (3)
- Cockroach (3)
- Composites (3)
- Corrosion resistance (3)
- Creep (3)
- Cutting tools (3)
- Discotic Liquid Crystals (3)
- Fatigue strength (3)
- Fireworks (3)
- Fluid transport (3)
- Glass (3)
- Gut microbiota (3)
- In situ (3)
- LIBS (3)
- Mechanical properties (3)
- Mechanochemistry (3)
- Microbiologically influenced corrosion (MIC) (3)
- Multiple crack propagation (3)
- NDT (3)
- Neutron diffraction (3)
- Niobium carbide (3)
- Nutrition (3)
- POD (3)
- Photophysics (3)
- Quenching and partitioning (3)
- Seal (3)
- Semiconductor quantum dot (3)
- Silver nanoparticles (3)
- Surface functionalization (3)
- TEM (3)
- Thermoelectrics (3)
- 3D Printing (2)
- Additives (2)
- Admixtures (2)
- Alloy 2618A (2)
- Artificial digestion (2)
- Austenitic stainless steels (2)
- Bacterial infection (2)
- Borosilicate glass (2)
- Calibration (2)
- Carbon steel (2)
- Cold cracking (2)
- Computed Tomography (2)
- Concrete (2)
- Constitutive law (2)
- Dark-field transmission electron microscopy (DFTEM) (2)
- Dendrimersomes (2)
- Dye (2)
- Earthen Materials (2)
- Environmental stress cracking (ESC) (2)
- FRET (2)
- Femtosecond laser ablation (2)
- Flash excitation (2)
- Flavins (2)
- Flourescence (2)
- Fluorescence decay kinetics (2)
- Fluorescence standard (2)
- Friction sensitivity (2)
- Full Notch Creep Test (FNCT) (2)
- Gas separation (2)
- Granulation (2)
- HPC (2)
- HSC (2)
- Hardness (2)
- Heat control (2)
- High water bearing glass (2)
- High-density polyethylene (PE-HD) (2)
- Higher-strength steels (2)
- Human factors (2)
- IIT (2)
- ISO 14577 (2)
- Initial crack size (2)
- Instrument calibration (2)
- Janus dendrimers (2)
- Laser ablation (2)
- Liquid chromatography (2)
- Lock-in excitation (2)
- Low cycle fatigue (2)
- Low temperature (2)
- MAG Welding (2)
- Martensite (2)
- Material (2)
- Measurement uncertainty (2)
- Membranes (2)
- Molecular mobility (2)
- Nanoconfinement (2)
- Nanoindentation (2)
- Nanostructures (2)
- NbC (2)
- Neutron Diffraction (2)
- Niobium carbide (NbC) (2)
- Non-destructive testing (2)
- Nuclear (2)
- Optical measurment technique (2)
- Physical aging (2)
- Polymer based nanocomposites (2)
- Portland cement (2)
- Power density dependence (2)
- Pressure assisted sintering (2)
- Pyrotechnics (2)
- Reibempfindlichkeit (2)
- Residual stress (2)
- Rubber (2)
- SAXS (2)
- SWIR (2)
- Selective laser melting (2)
- Shear Behaviour (2)
- Short crack propagation (2)
- Simulation (2)
- Single crystal (2)
- Slurry (2)
- Standard (2)
- Sub-Tg relaxation (2)
- TIG welding (2)
- TPU (2)
- Thermal desorption analysis (2)
- Thermoresponsive polymers (2)
- Ti-6Al-4V (2)
- Tribofilms (2)
- UCST polymers (2)
- Ultra thin polymer films (2)
- Ultrasonics (2)
- Ultrasound (2)
- Upconverting nanoparticles (2)
- Vesicles (2)
- Water speciation (2)
- Weathering (2)
- Weldments (2)
- X-ray CT (2)
- X-ray Refraction (2)
- 2,4-Dichlorophenoxyacetic acid (1)
- 2Disk (1)
- 2Disk test (1)
- 2Disk test machine (1)
- AAC (1)
- AFM (1)
- ATRP polymerization (1)
- Abbott (1)
- Abrasion (1)
- Absolute flourometry (1)
- Absolute fluoreometry (1)
- Absolute fluorescence quantum (1)
- Absorption coefficient (1)
- Accelerated Concrete Prism Test (1)
- Acoustic levitator (1)
- Acrylamide (1)
- Activation energy (1)
- Additive (1)
- Additive Fertigung (1)
- Adhesion (1)
- Adhesive strength determination (1)
- Aged biodiesel (1)
- Aged heating oil with 10% biodiesel (B10) (1)
- Aggregation (1)
- Air-coupled ultrasonic testing (1)
- Air-coupled ultrasonics (1)
- Alkali-silica reaction (1)
- Alpha-alumina (1)
- Aluminium (1)
- Aluminium alloy 2618A (1)
- Aluminium matrix (1)
- Aluminosilicate glasses (1)
- Ambient vibration tests (1)
- Analytical model (1)
- Analytics (1)
- Anti-Corrosion (1)
- Aperture focusing (1)
- Arc sensor (1)
- Architecture (1)
- Artificial third body (1)
- Asperities (1)
- Assay (1)
- Athorisation (1)
- Autoclaving (1)
- Automation (1)
- Axial stress (1)
- BAM (1)
- BAM drop test (1)
- BAM friction test (1)
- BAM-Fallhammer (1)
- BAM-Reibapparat (1)
- BPR (1)
- Back scatter imaging (1)
- Bacteria (1)
- Ball bearing steel (1)
- Bioapplication (1)
- Biocidal Products Regulation (1)
- Biocide (1)
- Biodeterioration (1)
- Biodetorioration (1)
- Bioethanol (1)
- Biofilm (1)
- Biology (1)
- Biomedical applications (1)
- Biophotonics (1)
- Biophotonik (1)
- Bioprospecting fuels (1)
- Bismuth (1)
- Bitter method (1)
- Blasting (1)
- Bonding (1)
- Borate glass (1)
- Brake friction materials (1)
- Brass (1)
- Burning rate (1)
- CAT-Technology (1)
- CCS (1)
- CCT diagrams (1)
- CMSX4 (1)
- CO2 corrosion (1)
- CT-scan (1)
- CTOD (1)
- CTW test (1)
- Calcium cobaltite (1)
- Calcium maganate (1)
- Carbide (1)
- Carbon (1)
- Carbon fiber reinforced polymers (1)
- Carbon-based Films (1)
- Carbon-fiber-reinforced plastic (1)
- Case studies (1)
- Catalysis (1)
- Cathodic (1)
- CdSe (1)
- Cement (1)
- Centrifugal Adhesion Testing (1)
- Ceramic (1)
- Ceramic springs (1)
- Cermet (1)
- Characterization of polymers (1)
- Chemical compositions (1)
- Chemical durability (1)
- Classification (1)
- Coating (1)
- Coefficient of friction (1)
- Coefficient of thermal expantion (1)
- Colloidal (1)
- Colloidal processing (1)
- Compatibility (1)
- Composite containers (1)
- Composite materials (1)
- Composite pressure vessel (1)
- Compression Behaviour (1)
- Compression behaviour (1)
- Computed tomography (CT) (1)
- Computer simulation (1)
- Computer tomography (1)
- Computertomographie (1)
- Condensation (1)
- Conformity assessment (1)
- Conformity assessment procedures (1)
- Contact problem (1)
- Continuous monitoring (1)
- Control (1)
- Control system design (1)
- Copolymer (1)
- Copolymer characterization (1)
- Core-rim (1)
- Core-shell architecture (1)
- Core-shell nanoparticles (1)
- Corrosion test (1)
- Cosolvency (1)
- Coupling techniques (1)
- Crack closure phenomenon (1)
- Crack detection (1)
- Crack driving force (1)
- Crack initiation probability (1)
- Crack resistance curve (1)
- Cracks (1)
- Creep effects (1)
- Creep resisting materials (1)
- Creep-fatigue (1)
- Crevice corrosion (1)
- Critical strain (1)
- Crystallography (1)
- Curative wood preservatives (1)
- Cutting (1)
- Cyclic J-integral (1)
- Cyclic yield stress (1)
- DLC (1)
- Damage inspection (1)
- Data-fusion (1)
- Deconvolution (1)
- Deformation (1)
- Degassing (1)
- Degree of degradation (1)
- Desensitized explosives (1)
- Destabilization (1)
- Determination (1)
- Dialectric materials (1)
- Dicotic liquid crystals (1)
- Die-cast aluminum (1)
- Dielectric materials (1)
- Diesel (1)
- Diffraction (1)
- Digital Image Correlation (1)
- Digital X-ray laminography (1)
- Digital factory (1)
- Digital image correlation (1)
- Digitalization (1)
- Dilatometry (1)
- Discotic liquid crystals (1)
- Dislocation (1)
- Dislocations (1)
- Dry-pressing (1)
- Ductile cast iron (1)
- Duplex-steel (1)
- Durability of glas facades (1)
- Dynamic characterisation (1)
- Dynamic loading (1)
- Dynamic testing (1)
- EBSD (1)
- Earthen materials (1)
- Efficacy (1)
- Efficiency (1)
- Eigenspannungen (1)
- Electromagnetic influence (1)
- Electromagnetic weld pool support (1)
- Electron transfer (1)
- Ellipsometry (1)
- Emission chamber testing (1)
- End of Life (1)
- Energetic systems (1)
- Energy transfer (1)
- Equivalent volumetric heat source (1)
- Erosion (1)
- Evaluation of crack fields (1)
- Expansion modelling (1)
- Experimental data (1)
- Experimental design (1)
- Explosive (1)
- Explosive spalling (1)
- Explosives law (1)
- Exposure test (1)
- Externally loaded test (1)
- FTIR (1)
- Facade panels (1)
- Failure (1)
- Fatigue (1)
- Fatigue testing standards (1)
- FeSnOx (1)
- Femtosecond laser (1)
- Feuerwerk (1)
- Fiber reinforced plastics (1)
- Fibre melt (1)
- Fibre reinforced concrete (1)
- Finite Element Method (1)
- Finite element method (1)
- Firestone (1)
- Fluorescence probes (1)
- Fluorescence quantum yield (1)
- Fluorescent glasses (1)
- Fluorometry (1)
- Foaming (1)
- Food additives (1)
- Formaldehyde (1)
- Full notch creep test (FNCT) (1)
- Fungi (1)
- GHS (1)
- GMAW (1)
- GTN model (1)
- Gas monitoring (1)
- Gas pressure sintering (1)
- Gefährdungsanalyse (1)
- Gefährdungsbeurteilung (1)
- Geothermal (1)
- Geothermal energy (1)
- Giant carbon dot (1)
- Glaskeramik (1)
- Glass powder sintering (1)
- Glass transition (1)
- Glass-fiber-reinforced plastic (1)
- Grain growth (1)
- Grain size (1)
- Guidance (1)
- H-bonding monomers (1)
- HPLC (1)
- Hard materials (1)
- Hard metal (1)
- Hazard analysis (1)
- Heat affected zone (1)
- Heated concrete (1)
- Heating oil tanks (1)
- Heterogeneous (1)
- High ductility (1)
- High power laser beam welding (1)
- High strength stells (1)
- High-performance concrete (1)
- High-strength steel (1)
- High-temperature behavior (1)
- Ho(III) (1)
- Hot crack (1)
- Hot cracking (1)
- Hot cracking test (1)
- Hot isostatic pressing (HIP) (1)
- Hot steam (1)
- Human error (1)
- Humidity (1)
- Hybrid laser arc welding (1)
- Hybrid organic-inorganic copolymers (1)
- Hydration (1)
- Hydrogen concentration (1)
- Hydrogen diffusion (1)
- Hydrous glass (1)
- IN625 (1)
- IPM (1)
- IR fluorescence (1)
- ISO mechanical testing standard (1)
- Image Analysis (1)
- Image reconstruction (1)
- Imaging (1)
- Impact sensitivity (1)
- Impact test (1)
- In situ characterization (1)
- In situ chemical composition (1)
- In situ measurements (1)
- In-situ (1)
- In-situ testing (1)
- Indentation fracture toughness (1)
- Infection (1)
- Initial hydration (1)
- Instrument qualification (1)
- Instrumented Indentation Testing (1)
- Instrumented indentation testing (1)
- Integrating sphare spectroscopy (1)
- Interlaboratory Comparison (1)
- J-integral (1)
- Knufia petricola (1)
- Konformitätsbewertung (1)
- KorroPad (1)
- LC/MALDI-TOF-MS (1)
- LCCC (1)
- LIPSS (1)
- LMOF (1)
- Labelling (1)
- Lanthanide emitter (1)
- Large concrete blocks (1)
- Large deformation (1)
- Laser Metal Deposition (1)
- Laser Scanning Microscopy (LSM) (1)
- Laser beam Welding (1)
- Laser beam welding (1)
- Laser metal deposition (1)
- Laser processing (1)
- Laser thermography (1)
- Laser-induced periodic surface structures (1)
- Laser-thermographic testing (1)
- Lateral displacement (1)
- Latin hypercube (1)
- Lattice structures (1)
- Layer-based sensors (1)
- Layerwise Slurry Deposition (1)
- Layerwise slurry deposition (1)
- Leakage (1)
- Levitation (1)
- Lifetime (1)
- Limestone filler (1)
- Limit load analysis (1)
- Lizards (1)
- Local electrochemistry (1)
- Loss modul (1)
- Loss of safety (1)
- Low melting (1)
- MALDI-TOF-MS (1)
- MOFs (1)
- Machining (1)
- Magnetic domains (1)
- Magneto-optical coupling (1)
- Magnetron sputtering (1)
- Martensitic stainless steels (1)
- Masonry tower (1)
- Mass spectrometry (1)
- Materials (1)
- Materials data (1)
- Measurement Uncertainty (1)
- Mechanical design (1)
- Metal Reducing Bacteria (MRB) (1)
- Metal coatings (1)
- Metal matrix composite (1)
- Metal reducing bacteria (MRB) (1)
- Metal sulphides (1)
- Metal sulphies (1)
- Metrology (1)
- Micro cracking (1)
- Micro-mechanics (1)
- Microbiologically influenced corrosion (1)
- Microbiology (1)
- Microfluidic (1)
- Microfluidic device (1)
- Micromixer (1)
- Micromixers (1)
- Microwave application (1)
- Microwaves (1)
- Milling (1)
- Modal analysis (1)
- Model (1)
- Modelling (1)
- Moisture clog (1)
- Moisture transport (1)
- Molecular switches (1)
- Molecularly imprinted polymers (1)
- Molybdenum dithiocarbamate (1)
- Moving mesh (1)
- Multi (1)
- Multi-parameter (1)
- NMR (1)
- Nano Referenzmaterialien (1)
- NanoIR (1)
- Nanochemistriy (1)
- Nanocomposites (1)
- Nanoparticel based pH-probes (1)
- Nanophotonics (1)
- Nanosafety (1)
- Nanotechnology (1)
- Narrow-gap welding (1)
- Natural defects (1)
- Nckel binder (1)
- Neural network (1)
- Neutronenbeugung (1)
- Nondestructive Testing (1)
- Nondestructive testing (1)
- Nonel (1)
- Notches (1)
- Nucleation (1)
- OSB (1)
- Oberflächenkeimbildung (1)
- Old House Borer (1)
- Optical Property (1)
- Optical probe (1)
- Optical sensor (1)
- Orientation (1)
- Orientierung (1)
- Orinentation distribution (1)
- PANi/SiO2 (1)
- PE-HD (1)
- PT8 (1)
- Particle board (1)
- Particle erosion (1)
- Penetration (1)
- Phase shifter (1)
- Photodegradation (1)
- Photogrammetry (1)
- Photovoltaic Module (1)
- Piezoelectricity (1)
- Pin-on-disc (1)
- Pipeline transport (1)
- Plasmonics (1)
- Pointwise constraints (1)
- Polyethylene (1)
- Polymer (1)
- Polymerizing substances (1)
- Polypropylene fibers (1)
- Polypropylene fibres (1)
- Polyurethane (1)
- Pore (1)
- Pores (1)
- Porosity reduction (1)
- Porous layers (1)
- Powders mixtures (1)
- Power plants (1)
- Pplasmon enhancement (1)
- Pressure increase rate (1)
- Pressure vessel (1)
- Preventive wood preservatives (1)
- Probabilistic analysis (1)
- Probability of detection (1)
- Process chain (1)
- Process hazard analysis (1)
- Product standard (1)
- Pulse thermography (1)
- Pyrotechnik (1)
- Quality assurance (1)
- Quantum Dots (1)
- Quantum Yield (1)
- Quantum confined stark effect (1)
- Quantum dot (1)
- RAFT polymerization (1)
- Radiography (1)
- Railway (1)
- Recovery (1)
- Reduction of calculation time (1)
- Reference Materials (1)
- Reference maerial (1)
- Reference yield load (1)
- Refraction radiography (1)
- Refraction tomography (1)
- Reliability of technical systems (1)
- Residual Stress analysis (1)
- Residual stress and distortion (1)
- Rheology (1)
- Rietveld (1)
- Ringversuche (1)
- Roughness (1)
- Round-robin tests (1)
- Rubber seal (1)
- Röntgenrefraktion (1)
- S-N curve (1)
- S31266 (1)
- SAPT (1)
- SEM (1)
- SEP-1220-3 (1)
- SOFC (1)
- SSG Technology (1)
- Safety (1)
- Sample performance chart (1)
- Sandblasting (1)
- Sandstorm (1)
- Scanning electrochemical microscope (SECM) (1)
- Schlagempfindlichkeit (1)
- Screen printing (1)
- Sealing materials (1)
- Seismic assessment (1)
- Selective Laser Melting (1)
- Self-assembly (1)
- Self-restraint test (1)
- Semiconductor (1)
- Semiconductor nanostructures (1)
- Semitransparent (1)
- Sensor (1)
- Sensors (1)
- Serial sectionning (1)
- Service life (1)
- Service life prediction (1)
- Shear behaviour (1)
- Shear softening (1)
- Shearography (1)
- Shells (1)
- Shock wave (1)
- Shore hardness (1)
- Short cracks (1)
- Shrinkage (1)
- Silca-metal nanoparticles (1)
- Silicate glass (1)
- Silicone sealants (1)
- Simulations (1)
- Single Crystal (1)
- Single Particle (1)
- Single particle (1)
- Single-shot EXAFS (1)
- Sinter/sintering (1)
- Sintering (1)
- Size and shape distribution (1)
- Size effect (1)
- Slip-rolling (1)
- Slow burst test (1)
- Slow crack growth (SCG) (1)
- Small-angle X-ray scattering (1)
- Smart NDT (1)
- Soil-structure interaction (1)
- Solar panels (1)
- Solid-state-reaction (1)
- Solidification cracking (1)
- Spalling (1)
- Specctroscopy (1)
- Specific heat spectroscopy (1)
- Spectroscopic Ellipsometry (1)
- Spin finish (1)
- Spontaneous polarization (1)
- Spray drying (1)
- Sprengstoffrecht (1)
- Stabilising agent (1)
- Standardisation (1)
- Standardization (1)
- Standards (1)
- Steam oxidation (1)
- Steel cleanliness (1)
- Storage modul (1)
- Strain gradients (1)
- Strengthening (1)
- Stress corrosion cracking (1)
- Structural health monitoring (1)
- Structural integrity (1)
- Structural welding simulation (1)
- Structure-property relationship (1)
- Sub critical crack growth (1)
- Super-austenitic stainless steel (1)
- Surface Enhanced Raman Spectroscopy (SERS) (1)
- Surface Plasmon Resonance (1)
- Surface group analysis (1)
- Surface plasmon resonance (SPR), (1)
- Surface water (1)
- Synchrotron X-ray diffraction (1)
- Synchrotron radiation (1)
- THz Time Domain Spectroscopy (1)
- THz radiation (1)
- THz-SAFT (1)
- TKD (1)
- Tank materials (1)
- Technical rule on manufacture of explosives and pyrotechnic articles (1)
- Technische Regel Herstellen von Explosivstoffen und pyrotechnischen Gegenstände (1)
- Temperature (1)
- Tensile properties (1)
- Terahertz synthetic aperture focusing (1)
- Termites (1)
- Test setup (1)
- The burning rate test (external fire) (1)
- Thermo-mechanical fatigue (1)
- Thermography (1)
- Thermomechanics (1)
- Thickness measurements (1)
- Thin films (1)
- Thiol ligand (1)
- Third body (1)
- TiO2 (1)
- Time resolution (1)
- ToF-SIMS (1)
- Traceability (1)
- Transformation induced plasticity (1)
- Transient heat transfer (1)
- Transmission electron microscopy (1)
- Transmittance (1)
- Trapping and diffusion (1)
- Tribological test (1)
- Tribometer (1)
- Tribotest (1)
- Tumbling (1)
- Tunnel (1)
- Turbine industry (1)
- UCST polymer (1)
- UCST-type polymers (1)
- UHPC (1)
- UPLC/ESI-TOF-MS (1)
- UV radiation (1)
- Ultra-High Performance Concrete (UHPC) (1)
- Ultra-thin polymer films (1)
- Ultrasonic Echo Technique (1)
- Ultrasonic atomization (1)
- Ultrasonic testing (1)
- Ultrathin polymer films (1)
- Upconversion nanocrystal (1)
- VDI Guide 3822 (1)
- Vacuum (1)
- Variable epsilon (1)
- Vessels (1)
- Vickers (1)
- Vickers indentation (1)
- Visco-elastic (1)
- Water bearing glass (1)
- Water migration (1)
- Wear behavior (1)
- Wear resistant (1)
- Wear volume (1)
- Webinar (1)
- Welding (1)
- Welding parameters (1)
- Welding simulation (1)
- Welding technology (1)
- Wetting (1)
- Wood protection (1)
- X-ray computed tomography (1)
- X-ray diffraction (XRD) (1)
- X-ray refraction (1)
- XANES (1)
- Yb(III) (1)
- Yield (1)
- non-destructive testing (1)
- organisational accidents (1)
Eingeladener Vortrag
- nein (276)
The presentation focuses on the current state of the optical spectroscopic studies on plasmon enhanced upconversion luminescent processes of silica-metal core-shell nanocomposites. A general introduction of the upconversion process, the theoretical basis of plasmonic enhancement, the theoretical requirements in regard to NP architecture for plasmon enhanced UC will be outlined. The first proof-of-concept measurements show the difficulty in realization the theoretical measurement parameters in laboratory conditions and underline the need for shifting the experiments to single particle level.“
The increased application of higher-strength steels and filler materials necessitates a more profound understanding of the interactions between the welding process, the heat input, the cooling conditions and the resulting metallurgical processes in the weid and its surroundings. Strategies, which help to improve the strength properties and life-time of welded stmctures to such an extent that the utilisation of higher-strength materials can be justified and their lightweight construction potential can thus be exploited to the füll, can only be derived from the interaction between all the influencing factors. Examples of a few investigations on welded joints between higher-strength fine-grained structural steels with regard to the interactions between the main variables influencing the cold cracking are presented in this article.
Strategic aspects for the development of measurement uncertainty annexes for ISO testing standards
(2017)
The presentation shows an overview over the current situation of the development of measurement uncertainty annexes for ISO mechanical testing standards. The comparability of measurement uncertainty statements is not ensured. The utilization of ready calculated measurement uncertainty values remains unclear. Partly the measurement uncertainty values clash with existing product standards where minimum values e.g. for the materials strength are determined. A route forward is shown to solve the current problems.
The digitalization of industrial processes is the most discussed topic in society these days. New business models have been developed to benefit from the opportunities offered by a digitally connected world. However, the focus in on the smart factory consisting of autonomous acting cyber physical systems (CPS). The efficient implementation of such CPS within an industrial environment requires the digitalization of the corresponding production processes. The digital twin of the process under investigation enables to develop sophisticated monitoring and control strategies which are necessary to fulfil the requirements of individual product design.
The need for a digitalization of the welding process is a logical consequence especially with regards to its industrial importance. The theoretical investigations and derived mathematical models of the welding process are well known since many decades. Anyhow, there is still a lack of industrial applicability of such models for an efficient and safe design of welded components. With respect to structural welding simulation that targets the heat effects of welding in terms of global quantities like temperature, solid phase distribution and residual stresses as well as distortions, the limited predictability of these quantities for arbitrary process parameters hinders its usability.
This presentation aims to give an overview of the current state of the art in structural welding simulation to predict the evolution of welding induced temperatures, stresses and distortions. Emphasis is given to industrial applicability of such models by reduction of the calculation times for large real-world structures and improved prediction of optimal process parameters. Furthermore, the role of such models within a weld data management system is demonstrated. The accumulation and relational storage of simulation and measuring data improves the overall process knowledge. This enables virtual cause and effect analyses of new process parameters as basis for a control system design.
The ageing of Fe-Cr model alloys in 0.5 % SO2 and 99.5 % Ar atmosphere was investigated to aim in a fundamental and systematic analysis of the combined oxidation and sulfidation mechanism. The crystallization and reaction paths for oxide and sulfide formation were followed in-situ by energy dispersive X-ray diffraction (EDXRD) in an early stage of corrosion (30 s – 24 h). For this technique, high energetic white synchrotron X-ray radiation (10-100 keV) was used as radiation source. Diffraction pattern were collected continuously in an early stage of corrosion up to 24 h during the complete ageing experiment.
The crystalline phases, growing on top of the coupons, were identified directly via their specific dhkl values. The evolution of the extracted integral intensities of specific reflections of the corrosion products as a function of time access direct information about the kinetics of the nucleation and growth. The results presented here show for iron with 2 wt% Cr wuestite formation first. Wuestite vanishes after 10 min of reaction only and magnetite and hematite appear. Magnetite formation proceeds simultaneously with sulfide formation. Sulfides growth proceeds after an incubation time, which differs for low alloyed (2 wt% Cr) and high alloyed (9 wt% Cr) material.
Laser metal deposition is described with its applications for additive manufacturing. The necessary process chain is discussed, with regard to weld bead dimensions and 3D build-up strategy. Metallurgical cross sections, x-ray and tensile tests are conducted. As demonstrative components, a gas turbine burner and a turbine blade are shown
Borosilicate glass has a wide range of technical applications due to its high chemical durability and thermal-shock resistivity. Here the effect of H2O on 16 Na2O, 10 B2O3,74 SiO2 glass is studied over a wide range of water contents from 0 to 8 wt.%. MIR spectra give evidence for the coexistence of strongly and weakly H-bonded hydrous species. Evaluation of NIR bands at 5200 cm-1 (molecular H2O), 4700 cm-1 (B-OH), and 4500 cm-1 (Si-OH) reveal that OH groups dominate up to ~6 wt.% H2O, with B-OH/Si-OH of ≈ 0.8. The incorporation of low amounts of H2O has strong impact on structure. NMR spectra of nominally dry glasses indicate a significant fraction (12 %) of 3-coordinated boron, but almost all boron is 4-coordinated after addition of 3 wt.% H2O. Raman spectra show that hydration results preferentially in transformation of Q4 to Q2 while Q3 remain unchanged, probably stabilized by bonding to BO4 tetrahedra. Viscosity measurements and differential thermal analysis give consistent results, confirming strong decrease of the glass transition temperature with addition of water from 849 K (dry) to 540 K (5 wt% H2O). An additional relaxation mechanism in hydrous glasses is inferred from dynamic mechanical analysis and is assigned to cooperative processes involving hydrous species. It is postulated that this relaxation mechanism plays an important role in crack growth kinetics.
Surface water-induced broadening of crack initiation probability of zinc aluminosilicate glasses
(2017)
The crack generation probability by Vickers indentation of glass surfaces is known to be influenced by the atmospheric conditions under which the Vickers experiment is performed [1]. However, the effect of surface water due to preparation and storage of the glass surfaces prior to the indentation is less understood. Therefore, zinc aluminosilicate glasses of perzinc, peraluminous as well as nominally NBO-free meta-aluminous composition were prepared by melt quenching. Surfaces of cut and polished specimens of these glasses were either stored for seven days under constant atmosphere (50 °C; 55% RH) or etched (HF: 20vol%; 20 min) shortly before indentation. The obtained results show a strong variation of crack initiation behavior depending on chemical composition of the glasses as well as sample preparation. All experiments were performed in dry nitrogen gas to minimize the influence of atmospheric humidity during indentation. While the regular glass surfaces exposed to humid air prior to Vickers indentation show a broad distribution of crack initiation probability, this distribution narrows down if etched glass surfaces are tested. SNMS depth profiling shows a water enriched layer at the surface (150 μm) for the non-etched and stored specimens leading to the conclusion that surface water causes broadening of the crack initiation probability of glass surfaces.
Borosilicate glass has a wide range of technical applications due to its high chemical durability and thermal-shock resistivity. Here the effect of H2O on 16 Na2O, 10 B2O3,74 SiO2 glass is studied over a wide range of water contents from 0 to 8 wt.%. MIR spectra give evidence for the coexistence of strongly and weakly H-bonded hydrous species. Evaluation of NIR bands at 5200 cm-1 (molecular H2O), 4700 cm-1 (B-OH), and 4500 cm-1 (Si-OH) reveal that OH groups dominate up to ~6 wt.% H2O, with B-OH/Si-OH of ≈ 0.8. The incorporation of low amounts of H2O has strong impact on structure. NMR spectra of nominally dry glasses indicate a significant fraction (12 %) of 3-coordinated boron, but almost all boron is 4-coordinated after addition of 3 wt.% H2O. Raman spectra show that hydration results preferentially in transformation of Q4 to Q2 while Q3 remain unchanged, probably stabilized by bonding to BO4 tetrahedra. Viscosity measurements and differential thermal analysis give consistent results, confirming strong decrease of the glass transition temperature with addition of water from 849 K (dry) to 540 K (5 wt% H2O). An additional relaxation mechanism in hydrous glasses is inferred from dynamic mechanical analysis and is assigned to cooperative processes involving hydrous species. It is postulated that this relaxation mechanism plays an important role in crack growth kinetics.