Filtern
Erscheinungsjahr
Dokumenttyp
- Beitrag zu einem Tagungsband (25)
- Vortrag (15)
- Zeitschriftenartikel (9)
- Beitrag zu einem Sammelband (7)
- Posterpräsentation (1)
- Forschungsbericht (1)
Referierte Publikation
- nein (58) (entfernen)
Schlagworte
- Fracture mechanics (7)
- Safety assessment (6)
- Container design (5)
- Drop test (5)
- Ductile iron (5)
- Duktiles Gusseisen (5)
- Dynamic loading conditions (5)
- Simulation (5)
- Behälterdesign (4)
- Finite element method (4)
Organisationseinheit der BAM
Eingeladener Vortrag
- nein (15)
The 9 meter drop onto an unyielding target is one of the important mechanical tests within the safety assessment of transport casks for radioactive material. In general, the cask is equipped with impact limiters to reduce the dynamic load on the cask body by absorbing a major part of the kinetic energy. The impact limiters are often made of wood or aluminium. In this study an elastic-plastic material model with volume change was used to describe the stress-strain behaviour of wood found in crush tests. For aluminium, an elastic-incremental plastic material model with Cowper-Symonds parameters for strain rate depending material hardening was used to model the adiabatic stress-strain relations measured at specimens at constant ambient temperature. Hereafter simulations with a sophisticated finite element model were carried out and compared with different drop tests. Four drop tests of a half-scale cask model equipped with wood and aluminium impact limiters with different drop positions were selected to investigate the impact limiter behaviour during a 9 meter drop test. All drop tests were simulated with the same FE mesh but under different boundary and initial conditions.
Validation of Numerical Simulation Models for Transport and Storage Casks using Drop Test Results
(2012)
The safety of transport packages may be demonstrated by numerical calculation of load scenarios defined in the IAEA regulations. Possible handling accidents of casks at interim storage sites or in a final repository are typically analyzed by dynamic finite element computations. In each case the investigated load scenario must be transferred into a mathematical model. Secondly the mathematical model must be transferred into a numerical model. Reliable finite element models should be developed by assembling verified sub-models of components. The finite element mesh, material modeling, initial and boundary conditions, contact definitions, and time integration as well as the benefit of pre- and post-calculations are discussed. The paper presents lessons learnt from modeling dynamic test scenarios for finite element analyses over the years.
Finite element analysis (FEA) has been carried out for investigation of damping concrete under different impact loading conditions with a built-in material model and damage criteria available in FEA code ABAQUS.
At first, all parameters for the selected material model had been derived from compression Tests of cubic specimens. After that, a validation was carried out with different static and dynamic penetration tests. Finally, a 5 meter real drop test with a 23 Mg cylindrical cask could successfully be simulated.