Filtern
Dokumenttyp
- Beitrag zu einem Tagungsband (8)
- Zeitschriftenartikel (2)
- Vortrag (2)
- Forschungsbericht (1)
Schlagworte
- Composite (4)
- Modal analysis (4)
- Probabilistic (4)
- Regulations (4)
- Composite pressure vessel (3)
- Hydrogen (3)
- Composite cylinder (2)
- Cylinder (2)
- Druckbehälter (2)
- GTR 13 (2)
Organisationseinheit der BAM
- 3 Gefahrgutumschließungen; Energiespeicher (10)
- 3.5 Sicherheit von Gasspeichern (6)
- 3.0 Abteilungsleitung und andere (4)
- 8 Zerstörungsfreie Prüfung (3)
- 3.3 Sicherheit von Transportbehältern (2)
- 3.1 Sicherheit von Gefahrgutverpackungen und Batterien (1)
- 8.0 Abteilungsleitung und andere (1)
- 8.1 Sensorik, mess- und prüftechnische Verfahren (1)
- 8.5 Röntgenbildgebung (1)
- 8.6 Faseroptische Sensorik (1)
Eingeladener Vortrag
- nein (2)
Hydrogen is an attractive energy carrier that requires high effort for safe storage. For ensuring safety, they must undergo a challenging approval process. Relevant standards and regulations for composite cylinders used for the transport of hydrogen and for its onboard storage are currently based on deterministic (e.g. ISO 11119-3) or semi-probabilistic (UN GTR No. 13) criteria. This paper analysis the properties of such methods with respect to the evaluation of load cycle strength. Their characteristics are compared with the probabilistic approach of the BAM. Based on Monte-Carlo simulations, the available design range (mean value and scatter of strength criteria) of current concepts was exemplarily estimated. The aspect of small sample sizes is analysed and discussed with respect to the evaluation procedures.
Due to high specific stiffness a nd strength properties, fibre reinforced plastics are used more and more often for the construction of pressure vessels. Within a recent research project run by the Federal Institute for Materials Research and Testing (BAM), aging process of composite pressure vessels is investigated in order to be able to give more accurate lifetime predictions in the future. Focus is set on type III pressure vessels consisting of an aluminium tank which is fully wrapped with carbon fibre reinforced plastics. In order to increase high-cycle fatigue, residual stresses are induced into the pressure vessel during manufacturing process. In particular, residual compressive stresses within the inner aluminium layer have been defined as a main parameter affecting fatigue strength. The aim is to identify and evaluate residual stresses of the pressure vessel by analysing its modal parameters. Through the set-up of a finite-element model potential capability and validity for the use of modal analysis is proven and evaluated, considering influences resulting from manufacturing deviations, too. In the following, a number of stress sensitive modes are defined. Based on these preliminary numerical investigations, a test bench is set up in order to measure pressure vessels via an experimental modal analysis. A final critical evaluation regarding the accuracy of the modal analysis is made by comparing experimental results with data obtained through simulations.