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Organisationseinheit der BAM
- 9 Komponentensicherheit (108)
- 7 Bauwerkssicherheit (69)
- 5 Werkstofftechnik (45)
- 9.3 Schweißtechnische Fertigungsverfahren (45)
- 8 Zerstörungsfreie Prüfung (40)
- 7.6 Korrosion und Korrosionsschutz (29)
- 5.1 Mikrostruktur Design und Degradation (24)
- 9.5 Tribologie und Verschleißschutz (24)
- 7.1 Baustoffe (22)
- 6 Materialchemie (19)
- 8.0 Abteilungsleitung und andere (19)
- 9.4 Integrität von Schweißverbindungen (19)
- 9.6 Additive Fertigung metallischer Komponenten (15)
- 3 Gefahrgutumschließungen; Energiespeicher (13)
- 4 Material und Umwelt (13)
- 7.4 Baustofftechnologie (13)
- 5.2 Metallische Hochtemperaturwerkstoffe (11)
- 9.2 Versuchsanlagen und Prüftechnik (9)
- 6.2 Material- und Oberflächentechnologien (8)
- 8.4 Akustische und elektromagnetische Verfahren (8)
- 8.5 Röntgenbildgebung (8)
- 9.0 Abteilungsleitung und andere (8)
- 2 Prozess- und Anlagensicherheit (7)
- 3.4 Sicherheit von Lagerbehältern (7)
- 5.3 Polymere Verbundwerkstoffe (6)
- 1 Analytische Chemie; Referenzmaterialien (5)
- 4.2 Material-Mikrobiom Wechselwirkungen (5)
- 6.6 Physik und chemische Analytik der Polymere (5)
- 1.2 Biophotonik (4)
- 4.1 Biologische Materialschädigung und Referenzorganismen (4)
- 5.5 Materialmodellierung (4)
- 6.1 Oberflächen- und Dünnschichtanalyse (4)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (4)
- 4.5 Kunst- und Kulturgutanalyse (3)
- 5.4 Multimateriale Fertigungsprozesse (3)
- 7.2 Ingenieurbau (3)
- 7.5 Technische Eigenschaften von Polymerwerkstoffen (3)
- 7.7 Modellierung und Simulation (3)
- 8.6 Faseroptische Sensorik (3)
- 2.1 Sicherheit von Energieträgern (2)
- 2.2 Prozesssimulation (2)
- 3.0 Abteilungsleitung und andere (2)
- 3.2 Gefahrguttanks und Unfallmechanik (2)
- 5.0 Abteilungsleitung und andere (2)
- 6.5 Synthese und Streuverfahren nanostrukturierter Materialien (2)
- 7.0 Abteilungsleitung und andere (2)
- 8.2 Zerstörungsfreie Prüfmethoden für das Bauwesen (2)
- 1.4 Prozessanalytik (1)
- 2.0 Abteilungsleitung und andere (1)
- 2.4 Prüfung und Bewertung von Explosivstoffen/Pyrotechnik (1)
- 2.5 Konformitätsbewertung Explosivstoffe/Pyrotechnik (1)
- 3.1 Sicherheit von Gefahrgutverpackungen und Batterien (1)
- 3.5 Sicherheit von Gasspeichern (1)
- 4.3 Schadstofftransfer und Umwelttechnologien (1)
- 5.6 Glas (1)
- 6.3 Strukturanalytik (1)
- 7.3 Brandingenieurwesen (1)
- 8.3 Thermografische Verfahren (1)
As an approach towards more rough industrial laser welding applications, the Nd:YAG laser welding process has been coupled to the plasma powder welding process for the first time. Process stabilities have been achieved by such hybrid welding which are even better than those known from previous coupling of the laser process with gas metal arc welding (GMAW), for instance.
The present contribution focuses on the technology and potentials of the novel laser hybrid welding technique and addresses the realisation and the perspectives for practical applications. The experimental results demonstrate that the new process coupling enables welding of austenitic stainless steels in the thickness range between 3 mm and 8 mm at various weld geometries and joint configurations and at welding speeds exceeding 2 m/min. In addition it has been proven that the laser plasma powder arc welding (LPPAW) technique can also be applied to out-of-position conditions. Continuous advancement of the welding equipment ensures a high gap bridging ability and levelling of misalignment due to higher powder feeding rates. The recent development of a new plasma powder torch even provides a higher efficiency of powder feeding and guarantees smoth weld surfaces. Up to the present, the investigations demonstrated that the novel laser plasma powder hybrid welding technique offers all perspectives for application in pipe fabrication, ship building and offshore as well as transportation industry.
The increasing application of supermartensitic steels for welded pipelines is an economical alternative to the hitherto used higher-alloyed materials in the North Sea oil and gas indus-try. Failure in such constructions must at any rate be excluded for economical and ecologi-cal reasons. The application of these steels for the transport of corrosive mixtures may, however, involve hydrogen pickup with subsequent hydrogen-assisted stress corrosion cracking. It is therefore necessary not only to assure the weldability, but particularly to have best possible knowledge of the service behaviour and of the failure risk. In order to ensure the transferability of test results to real joined components, innovative test methods are in-creasingly required to be incorporated into a closed test sequence. It will be demonstrated how it is possible to gain significant advantages from the direct comparison between ex-perimentally determined results from component weld tests on the one hand and material-specific data from small-scale tests on the other hand and numerical simulations. These data that have now been made available are of major importance for industrial applications and are considered to provide a sound basis for realistic lifetime assessments.
In the last decade, high-strength fine grained steels and welding consumables have gained a strong raise of application ranging from mobile cranes to bridge constructions. However, the cracking susceptibility of these steels increases significantly in correspondence with the achieved improvements in yield strength and the loss in plastic deformation reserves.
In order to determine this behavior a series of different standardized cold cracking tests has been developed. One remaining major problem of these tests is the uncertainty about the quantitative intensity of the restraint conditions as well as the corresponding welding residual stresses.
Consequently, the comparison of different tests and welding conditions as well as the transferability of the results onto real parts is difficult at best. The main topic of this paper is the analysis of the restraint conditions and their link with the welding induced residual stresses. The importance of the given standardized selfrestrained tests and first results about the transferability of
results onto real parts are discussed. The influence of the test specimen geometry on the restraint conditions of the test is investigated for a selected test with numerical Simulation using commercial FEA software. Additionally, the residual stresses caused by the welding process are measured and linked with the restraint conditions which are defined mainly by the geometry parameters.
Finally the transferability of the selected cold cracking test results is validated experimentally. The test results of a multilayer weld on high-strength fine grained steel of real size weldments are investigated. For these experiments a 16 MN large scale testing facility is used which is capable of applying the high reaction forces and clamping conditions found at large scale demonstrator parts.
The results show the importance of the quantitative knowledge of the restraint conditions and the welding residual stresses on the cold cracking resistance.
Within the last decade, silicon drift detectors (SDD) systems have become more and more popular in the field of energy-dispersive spectroscopy (EDS). The main characteristic of the SDDs is their extremely high pulse load capacity of up to 750,000 counts per second at good or reasonable energy resolution (<123eV Mn-Kα, <46eV C-Kα at 100.000 cps). These properties in conjunction with electron backscatter diffraction (EBSD) techniques and modern data processing make a range of innovative analysis options possible, not only high speed mapping but also hyperspectral imaging techniques.
The use of energetic materials as a main fuel in high temperature process
industries are not known to the scientific community as such. This paper
highlights some of the features and advantages of using organic peroxides
especially di-tert-butyl peroxide (DTBP) in high temperature process industries.
The feasibility of using DTBP as a main or supporting fuel in process industries
have also been justified with the help of Computational Fluid Dynamics (CFD)
simulations. For peroxides requirement of less fuel and air for the same amount
of heat flux has been shown. The resulted emission from the combustion of
DTBP is also discussed.
Meteorites are a unique and inspiring material for microstructural studies because if their very specific genesis. Iron meteorites have been formed under unimaginable cooling rates of a few ten Kelvins per million years so that the observable transformation of the formerly huge Fe-Ni single crystals of taenite occurred under nearly-equilibrium conditions. Octahedrites (meteorites having a Ni content between 6...15%) are characterized by ribbons of the low-temperature Fe-Ni phase kamacite separated by rims of residual taenite. This very specific feature is known as Widmanstaetten structure and has been investigated by synchrotron radiation in order to cover a higher volume fraction for a statistically relevant description of orientation relationships. However, plessite – a microstructure mainly consisting of the same phases – reflects the orientation relationship between kamacite and taenite as well. For their characterization, a scanning electron microscope is very suitable in order to investigate crystal orientations or identify phases. Despite the apparently ideal formation circumstances of iron meteorites, Ni concentration profiles prove non-equilibrium conditions. Combined EDS (energy dispersive spectroscopy) and EBSD (electron backscatter diffraction) measurements at a selected plessitic region of the Cape York iron shows that a correlation exists between Ni-concentration and the locally detected orientation relationship.
This study focuses on concrete flow in presence of obstacles and develops a mathematical model and a computational approach for SCC flow through reinforced formworks. In order to decrease high computational times needed to simulate castings through reinforced elements, an innovative approach to model the reinforced sections as porous media is proposed here. In the previous work, this numerical model is proved able to simulate the free-surface flow of non-Newtonian fluids through the reinforcement networks. In the present study, the applicability of the model on the concrete flow will finally be proved. The large-scale form-filling experiments with SCC will be conducted and the experiments will be simulated using the proposed numerical model. The numerical model will then be validated through the comparison of the experimental results and the results of the numerical simulations.
Fibre Reinforced Plastics (e.g. CFRP, GFRP) characteristically show nonlinear stress-strain behaviour due to intralaminar shear loading. The determination of the in-plane shear stiffness and strength for this class of material is difficult and common test standards and methods of analysis are partially inaccurate. The identification of the in-plane shear properties was made with an especial designed “picture frame test device” which enables shear loading up to 950N/mm. Therefore the strength limit can be reached at specimens with adequate thickness and a high safety factor against buckling. Due to the chosen design the maximum of the shear loading and the final failure occur in the centre of the specimen. The experiments match with the numerical analysis.
Today’s light weight design trends lead to a growing application of high-strength structural steels (yield strength ≥ 690 MPa). The mechanical properties of the weld and the component safety have to meet the increased requirements of these steel grades. However, high residual stresses in welded components are detrimental to their safety and integrity. Analyses concerning weld stresses in high-strength steels welded under component related restraint conditions revealed that heat control significantly affects global and local stresses. This occurs especially in highly restrained joints due to superimposing local and global stresses and may cause crack-critical stress-levels. In this study weld tests were performed with plates of high-strength steel in a special test facility. The experimental setup allowed transferring defined restraint conditions to the test welds similarly to real components. Temperature and reaction forces due to restraint were observed online while welding and cooling of multilayer-component MAG-welds. Mobile X-ray diffraction was used for local stress determination in the weld seam areas of the restrained specimens. It was found that interpass temperature has a major influence on the local and global welding forces and stresses. Thus, among the analysed results especially transverse residual stresses of the heat affected zone were strongly affected.
Emergency response units increasingly use pressure cylinders made from fibre composites for breathing air as elements of personal protective equipment (PPE). Such applications expose the composite cylinders to harsh temperature and handling conditions. At least in Europe, standards have been used for certifying PPE, which are designed and mandatory for the approval of pressure receptacles for the transport of dangerous goods. Therefore, service conditions specific to PPEs are not accounted for in these standards. In this paper, BAM (Federal Institute for Materials Research and Testing) investigates the residual safety of a composite cylinder design at the end of their designated service life of 15 years. The cylinders (test pressure PH 450 bars; 6.8 Litres) are of one design type with aluminium liner and fully wrapped with carbon fibres, which is commonly considered a “Type III” cylinder. All cylinders were used as PPE by the Berlin fire department and randomly picked in three samples of 25 cylinders each before tested.
At BAM, the cylinder samples underwent hydraulic load cycle tests (LCT), conventional burst tests (BT) and so called slow burst tests (SBT). A concept for quantification of strength degradation already introduced by BAM was applied. This concept is based on a probabilistic assessment of the average strength and scatter of each sample of cylinders. The strength distributions of the used PPEcylinders is shown and analysed. Some unexpected effects are shown and a refinement of the statistical assessment is introduced.