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Erscheinungsjahr
- 2006 (1359) (entfernen)
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Eingeladener Vortrag
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SAFEKINEX - Reports in WP2
(2006)
Es wird gezeigt, dass mit einer Kombination der Oberflächenanalyseverfahren ESCA, ToF- SIMS und XAS eine erfolgreiche chemische Charakterisierung von Plasmapolymerfilmen erreicht werden kann. Es werden Elemente und Bindungstypen identifiziert und (semi-)quantitativ bestimmt. Eine Korrelation zwischen Abscheidebedingungen und chemischen Eigenschaften der Plasmapolymerschichten kann hergestellt werden; eine kontrollierte Abscheidung wird damit möglich. Alterungsprozesse, die als Folge einer Atmosphärenexposition auftreten, können beobachtet werden. Die direkte Verbindung der Analysetechniken mit einem Plasmareaktor ermöglicht es, die Alterungsphänomene der Schichten systematisch mit Bezug auf eine frisch abgeschiedene und keinerlei Atomsphäre ausgesetzte Plasmapolymerschicht zu studieren.
Die Verfahrensweise wird exemplarisch am Beispiel von Ethylen-, Allylamin- und Allylalkohol-Plasmapolymerschichten demonstriert.
Self-ignition of n-Butane/Air NTC-Region in the stainless steel vessel - Experimental results -
(2006)
A toolbox with non-destructive testing methods for the condition assessment of railway bridges
(2006)
The unified economic structure of the European market requires a unified transport infrastructure to ensure seamless and barrierfree transportation of passengers and goods. The European commission is funding the European Integrated Project Sustainable Bridges to comply with future traffic demands. The main objective of the project is to reliably assess and upgrade the bridge infrastructure for the required increase of axle loads and transport volume. 32 Institutes from 12 countries develop unified procedures for the assessment and improvement of the existing railway bridge stock under the guidance and review of six major European railway companies.
Non destructive testing (NDT) is given a high priority. One of the work packages concentrates on the potential of advanced NDT-methods and creates a toolbox with advisable methods for the condition assessment of all types of railway bridges. Although NDT-methods are implemented in the quality assurance process in many industries, their application in the railway infrastructure is not common. Only a few countries have included selected NDT-methods into advanced condition assessment procedures for the management of their bridge stock.
This paper describes also current activities to enhance pulse-phase thermography, impulse-radar and acoustic methods. The advanced methods enable infrastructure owners to verify construction plans, to assess structures, repair and strengthening quality or to identify in-service damages. Latest development is an automated scanning system for combined acoustic and electromagnetic measurements. The results are then combined through data fusion techniques to further increase their value for the bridge owners.
Im Rahmen von MICROCON, einem europäischen CRAFT-Projekt,
besteht eine wesentliche Zielsetzung in der Optimierung von selbstverdichtendem Beton (SVB) im Hinblick auf Kosten und Leistungsfähigkeit durch den Einsatz von teilweise puzzolanischen Microfillern. Um die Puzzolanität bei der Beurteilung besser bewerten zu können, wird ein Referenzbeton benötigt, der aus weitestgehend inerten Zusatzstoffen besteht. Die Entwicklung eines solchen Referenzbetons fand an der BAM nach der japanischen Methode nach Okamura statt.
Ziel der Untersuchungen war es, herauszufinden ob die Druckfestigkeit hochfester Betone zerstörungsfrei mit dem Rückprallhammer PROCEQEQUOSCHMIDT durch Ermittlung des klassischen Rückprallwerts R in Kombination, mit einem aus der Untersuchung von Metallen bekannten neuen Messwert L mit ausreichender Sicherheit beschrieben werden kann.
Die Regelwerke (RL SIB, ZTV-ING) setzen für die Instandsetzung mit Betoninstandsetzungssystemen vergleichsweise hochwertige Betonuntergründe voraus. Speziell bei älterenWasserbauwerken sind oftmals nur geringerfeste Betonuntergründe vorhanden für die es bis jetzt keine geeigneten und geprüften Instandsetzungssysteme gab. Grundlage für die Entwicklung solcher Systeme sind entsprechende Referenzbetone als Untergrundbeton für die Verbundkörperprüfung.
Single-pulse damage thresholds of hydrogenated amorphous carbon (a-C:H) films were measured for 8-ns laser pulses at 532-nm wavelength. Layer thicknesses from below the optical penetration depth to above the thermal diffusion length (60 nm13 µm) were examined. After correction of the damage-threshold values for the fraction of energy effectively absorbed by the material, the damage threshold was found to increase linearly with the layer thickness, also for film thicknesses below the optical penetration depth of a-C:H. The threshold fluence reached the bulk value for a layer thickness equal to the thermal diffusion length. The thermal diffusion coefficient was obtained from fitting the experimental data. Several phenomena like graphitization, blistering, exfoliation, and ablation were observed for different fluence regimes and film thicknesses.
GD-OES as an analytical tool for electroplated components susceptible to hydrogen embrittlement
(2006)
GD-OES as an analytical tool for electroplated components susceptible to hydrogen embrittlement
(2006)
The role of Fe3+ ions in the transformations from boehmites and pseudoboehmite xerogels via transition aluminas to corundum was studied here. Especially, the active iron species responsible for the decrease of the temperature of transformation to corundum were looked for. To enable the formation of various Fe3+
and Fe2+ species, samples were subjected to thermal treatments in different atmospheres as well as mechanically activated. Thermal analysis and ESR spectroscopy served to follow the processes and to characterise the resulting products. It was found that (i) isolated Fe3+ ions can indicate local structural changes but have (almost) no influence on the temperature of corundum formation, (ii) the temperature of corundum formation decreases in the result of action of small
α-Fe2O3 particles and (iii) during thermal treatments Fe3+ ions are distributed between different phases or precursors thereof: transition aluminas, corundum, Fe2O3, and a Fe3+ pool.
The recognition of surface damage on railway lines is of critical importance in order to guarantee a high level of safety for normal train operation. Without early recognition systems, defect damage (e.g. cracks) in the rail, will in most cases, increase in size and can eventually lead to fracture of the rail. Special grinding trains are in general use for rail maintenance and are employed to machine down worn rails and prevent surface damage in an early stadium.
The company SPENO INTERNATIONAL SA along with the BAM and other partners have integrated an eddy current instrument in the grinding train. The equipment has been developed for detection of Head Check type defects and provides information on defect position and depth. Initial experiments were presented at the DACH-conference 2004 in Salzburg. This system has been continually developed and as will be shown is ready for practical application. The main characteristics of this system are:
- 4 channel measurement per rail.
- Online monitoring and presentation of the results
- Online protocol and after grinding, in reference to defect free control and presentation
The actual measuring system and results will be presented.
Advantage of a combined ultrasonic and eddy current examination for railway inspection trains
(2006)
Some years ago two railway inspection trains (RIT) already equipped with ultrasound, had additional advanced eddy current techniques installed. Recently a new RIT, was equipped with a system that was designed, from the beginning, to employ a combination of these two techniques for non-destructive rail inspection. The eddy current technique has been developed to enable identification and evaluation of rolling contact fatigue (RCF) defects. The ultrasound technique is aimed at measurements in the rail bulk volume, which are not feasible using the eddy current technique. Experience gained from application has shown that clear improvement on rail inspection can be achieved. For example, following DB AG guideline defects which are classified as group 2 using ultrasound testing can be further labeled as "distinguished positions" if for example head checking can be identified in the same position using the eddy current technique i.e. the new technique is capable of identifying two fundamentally different types of defects occurring at the same location. Such defects can then be then classified as Group 1 equivalent according to the DB AG guideline. Furthermore,- problem cases in the past, such as the decision whether a weld or rail joint is present for a fishing table can be reliably determined using additional information from the eddy current technique. In this presentation examples will be provided to demonstrate application.
Experiments were performed on the influence of pre-ignition turbulence on the course of vented gas and dust explosions. A vertical cylindrical explosion chamber of approximately 100 l volume and a length-to-diameter ratio (l/d) of 4.7 consisting of a steel bottom segment and three glass sections connected by steel flanges was used to perform the experiments. Sixteen small fans evenly distributed within the chamber produced turbulent fluctuations from 0 to 0.45 m/s. A Laser-Doppler-anemometer (LDA) was used to measure the flow and turbulence fields. During the experiments the pressure and in the case of dust explosions the dust concentration were measured. In addition, the flame propagation was observed by a high-speed video camera. A propane/nitrogen/oxygen mixture was used for the gas explosion experiments, while the dust explosions were produced by a cornstarch/air mixture.
It turned out that the reduced explosion pressure increased with increasing turbulence intensity. This effect was most pronounced for small vents with low activation pressures, e.g. for bursting disks made from polyethylene foil. In this case, the overpressure at an initial turbulence of 0.45 m/s was twice that for zero initial turbulence.
A numerical model is presented which consists of a set of partial differential equations for the transport of heat and mass fractions of eight chemical species to describe the onset of self-ignition and the propagation of smouldering fires in deposits of bulk materials or dust accumulations. The chemical reaction sub-model includes solid fuel decomposition and the combustion of char, carbon monoxide and hydrogen.
The model has been validated against lab-scale self-ignition and smouldering propagation experiments and then applied to predictions of fire scenarios in a lignite coal silo. Predicted reaction temperatures of 550 K and propagation velocities of the smouldering front of about 6 mm/h are in good agreement with experimental values derived from lab-scale experiments.
The limiting values of fuel concentration in a flammable fuelair mixture are the LEL (lower explosion limit) and UEL (upper explosion limit). The addition of an inert component to fuel/air mixtures determines the increase of LEL and decrease of UEL, until these values finally merge at the inerting point. The maximum oxygen amount of a non-flammable fuelairinert mixture is the LOC (limiting oxygen concentration), an important safety characteristics.
The investigation of a comprehensive set of flammability data at elevated temperatures and ambient pressure taken from literature sources was made for systems containing nitrogen, carbon dioxide and water(vapour) as inert components, at 100°, 200° and 250 °C. The adiabatic flame temperatures at LEL (CAFTLEL) and LOC (CAFTLOC) were calculated by taking into account the dissociation of gases within the flame. A linear correlation of CAFTLOC versus CAFTLEL was empirically derived for the examined systems. The slope and intercept of the correlation are dependent on temperature and on nature of the inert gas. The correlation allows the development of a simple procedure for estimating LOC, when the LEL of fuelair and the equivalence ratio of the fuelairinert mixture at the inerting point are known.
Knowing the scarce information concerning the flammability of fuelairinert mixtures at temperatures higher than ambient, the proposed procedure brings about an useful tool for estimation of LOC.