Refine
Year of publication
- 2005 (130) (remove)
Document Type
- Article (99)
- Conference Proceeding (23)
- Book (5)
- Part of a Book (1)
- Lecture (1)
- Working Paper (1)
Language
- English (130) (remove)
Keywords
- Bauingenieurwesen (2)
- CAD (2)
- civil engineering (2)
- Alternating plasticity (1)
- Analytischer Zulaessigkeitsnachweis (1)
- Axialbelastung (1)
- Axially cracked pipe (1)
- Deformation (1)
- Design-by-analysis (1)
- Einspiel-Analyse (1)
- Einspiel-Kriterium (1)
- Einspielen <Werkstoff> (1)
- Energietechnik (1)
- Energy (1)
- Energy Systems (1)
- Evolutionary Neurocontrol (1)
- FEM (1)
- Finite-Elemente-Methode (1)
- Global and local collapse (1)
- Grenzwertberechnung (1)
Institute
- Fachbereich Medizintechnik und Technomathematik (40)
- Fachbereich Luft- und Raumfahrttechnik (27)
- IfB - Institut für Bioengineering (23)
- Fachbereich Energietechnik (19)
- Fachbereich Elektrotechnik und Informationstechnik (15)
- INB - Institut für Nano- und Biotechnologien (15)
- Fachbereich Chemie und Biotechnologie (10)
- Fachbereich Maschinenbau und Mechatronik (8)
- Fachbereich Wirtschaftswissenschaften (5)
- Freshman Institute (4)
- Fachbereich Architektur (1)
- Nowum-Energy (1)
- ZHQ - Bereich Hochschuldidaktik und Evaluation (1)
Limit loads can be calculated with the finite element method (FEM) for any component, defect geometry, and loading. FEM suggests that published long crack limit formulae for axial defects under-estimate the burst pressure for internal surface defects in thick pipes while limit loads are not conservative for deep cracks and for pressure loaded crack-faces. Very deep cracks have a residual strength, which is modelled by a global collapse load. These observations are combined to derive new analytical local and global collapse loads. The global collapse loads are close to FEM limit analyses for all crack dimensions.
In the new European standard for unfired pressure vessels, EN 13445-3, there are two approaches for carrying out a Design-by-Analysis that cover both the stress categorization method (Annex C) and the direct route method (Annex B) for a check against global plastic deformation and against progressive plastic deformation. This paper presents the direct route in the language of limit and shakedown analysis. This approach leads to an optimization problem. Its solution with Finite Element Analysis is demonstrated for mechanical and thermal actions. One observation from the examples is that the so-called 3f (3Sm) criterion fails to be a reliable check against progressive plastic deformation. Precise conditions are given, which greatly restrict the applicability of the 3f criterion.
Rapid Prototyping Technology: Types of models, rapid prototyping processes, prototyper Fundamentals of rapid prototyping Industrial rapid prototyping technology: Stereolithography, (Selective) laser sintering ((S)LS), Layer laminate manufacturing (LLM), Fused layer modeling (FLM), Three dimensional printing (3DP)
The Ministry of Science and Research in North Rhine-Westphalia created eight platforms of excellence, one in the research area „Energy and Environment“ in 2002 at ACUAS. This platform concentrates the research and development of 13 professors in Jülich and Aachen and of two scientific institutes with different topics: – NOWUM-Energy with emphasis on efficient and economic energy conversion – The Solar Institute Jülich – SIJ – being the largest research institute in the field of renewables at a University of Applied Sciences in Germany With this platform each possible energy conversion – nuclear, fossil, renewable- can be dealt with to help solving the two most important problems of mankind, energy and potable water. At the CSE are presented the historical development, some research results and the combined master studies in „Energy Systems“ and „Nuclear Applications“
One of the most important parameters in a burning chamber - in power stations, in waste to energy plants - is the temperature. This temperature is in the range of 700-1500 °C - one of the most advanced measuring methods being the acoustic pyrometry with the possibility of producing temperature mapping in one level of the burning chamber - comparable to computer tomography. The results of these measurements discussed in the presentation can be used - to fulfil the legal requirements in the FRG or in the EU - to equalise the temperature in one level of the burning chamber to optimise the steam production (better efficiency of the plant) and to minimise the production of temperature controlled flue gas components (NO, CO a. o.) - to control the SNCR-process if used.