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  • Droste, Bernhard (23) (entfernen)

Erscheinungsjahr

  • 2015 (1)
  • 2014 (1)
  • 2011 (1)
  • 2010 (3)
  • 2009 (1)
  • 2007 (3)
  • 2006 (1)
  • 2005 (1)
  • 2004 (6)
  • 2003 (1)
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Dokumenttyp

  • Beitrag zu einem Tagungsband (14)
  • Zeitschriftenartikel (6)
  • Beitrag zu einem Sammelband (2)
  • Forschungsbericht (1)

Sprache

  • Englisch (17)
  • Deutsch (6)

Schlagworte

  • Safety assessment (6)
  • Container design (5)
  • Ductile iron (5)
  • Dynamic loading conditions (5)
  • Fracture mechanics (5)
  • Duktiles Gusseisen (4)
  • Behälterdesign (3)
  • Bruchmechanik (3)
  • Dynamische Belastungsbedingungen (3)
  • Sicherheitstechnische Bewertung (3)
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Organisationseinheit der BAM

  • 3 Gefahrgutumschließungen (2)
  • 3.3 Sicherheit von Transportbehältern (2)
  • 3.4 Sicherheit von Lagerbehältern (2)

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Determination of material parameters of damping concrete under dynamic loading (2015)
Scheidemann, Robert ; Qiao, Linan ; Müller, Karsten ; Droste, Bernhard
The safety and integrity of casks for radioactive waste in accidental scenarios is analysed by BAM Federal institute tor Materials Research and Testing. An accidental scenario in German interim storage facilities is the drop from a crane during the handling operation. To reduce the mechanical loads to the cask a shock absorbing footing with high energy absorption capability is used in these areas. In order to analyse and evaluate such impact scenarios of casks, numerical simulations are performed. For a comprehensive simulation of an accidental scenario the behaviour of the damping concrete footing has to be taken into account as well and therefor a material model is needed. Material parameters under different loading conditions are the basis for a numerical model. For that reason a government funded research project (Kasparek, 2012) was conducted to characterise damping concrete under quasi-static as well as highly dynamic impact loading conditions. The performed tests include compression tests with and without lateral constraint small-scale and midscale penetration tests with different indenters, and finally a full-scale drop test onto a damping concrete footing.
Dynamic penetration tests on shock absorbing damping concrete (2014)
Scheidemann, Robert ; Kasparek, Eva Maria ; Qiao, Linan ; Müller, Karsten ; Droste, Bernhard ; Völzke, Holger
Mechanical assessment within type B packages approval: application of static and dynamic calculation approaches (2011)
Komann, Steffen ; Neumann, Martin ; Ballheimer, Viktor ; Wille, Frank ; Weber, Mike ; Qiao, Linan ; Droste, Bernhard
This paper demonstrates exemplarily how numerical and experimental approaches can be combined reasonably in mechanical assessment of package integrity according to the IAEA regulations. The paper also concentrates on the question about how static mechanical approaches can be applied, and what their problems are in relation to dynamic calculation approaches. Under defined impact tests, which represent accident transport conditions, the package has to withstand impact loading, e.g. resulting from a 9 m free drop onto an unyielding target in sequence with a 1 m puncture drop test. Owing to the local character of the interaction between the puncture bar and the cask body, it is possible to develop a dynamic numerical model for the 1 m puncture drop which allows an appropriate simulation of the interaction area. Results from existing experimental drop tests with prototype or small scale cask models can be used for verification and validation of applied analysis codes and models. The link between analysis and experimental drop testing is described exemplarily by considering a regulatory 1 m puncture bar drop test onto the cask body of a recently approved German high level waste transport package. For the 9 m drop test of the package, it is difficult to develop a dynamic numerical model of the package due to the complexity of the interaction between cask body, impact limiters and unyielding target. Dynamic calculations require an extensive verification with experimental results. The simulation of a 9 m drop of a package with impact limiters is thereby often more complex than the simulation of a 1 m puncture drop onto the cask body. A different approximation method can be applied for the consideration of dynamic effects on the impact loading of the package. In a first step, maximum impact force and rigid body deceleration of the cask body during the impact process can be calculated with simplified numerical tools. This rigid body deceleration can subsequently be applied on a verified static numerical model. Dynamic effects, which cannot be covered by the static numerical analysis, have therefore to be considered by using an additional dynamic factor. The paper describes this approach exemplarily for a 9 m horizontal drop of a typical spent fuel cask design.
Mechanical safety analyses of cast iron containers for the KONRAD repository (2010)
Zencker, Uwe ; Weber, Mike ; Qiao, Linan ; Droste, Bernhard ; Völzke, Holger
Within the last years BAM has carried out numerous drop tests with prototype casks made of ductile cast iron onto targets according to the requirements for final disposal of non-heat generating waste in the German KONRAD repository. The results have shown that the target specifications in the acceptance criteria have to be defined more accurately to get reproducible test results with high precision. Hence, a suitable test stand foundation was developed with much effort. The integrity of the upper concrete layer of this target must be preserved during a test. Recently the geometrical properties of a tested cubic cast iron container led to a concentration of the impact forces beneath the container walls. The target was damaged strongly with the consequence of inadmissible reduction of cask stresses. For that reason the target construction was modified. However, the basic design was not changed. A prefabricated concrete slab was still joined by a mortar layer to the IAEA target of the BAM drop test facility. In the course of the optimization of the test stand foundation the concrete slab dimensions and the reinforcement were enlarged. During the drop test repetition the target kept intact. Additionally, the mechanical behavior of the cast iron container and the target was analyzed by finite element calculations. This improved target construction is suggested as a reference target for drop tests with casks whose mass and base area are covered by the container types VI or VII respectively according to the KONRAD repository acceptance criteria. The measurements during the drop tests with cast iron casks have provided the strains on the cask surface at selected positions. This allows the verification of finite element simulations of drop tests which show the stress distribution also inside the component. In September 2008 a drop test was carried out with a cylindrical cast iron cask containing an artificial material defect which was designed under consideration of critical stress states in the cask body. This drop test could demonstrate the safety against failure by fracture of a cask made of a special cast iron with reduced fracture toughness.
Mechanical assessment within type B packages approval - the application of static and dynamic calculation approaches (2010)
Komann, Steffen ; Neumann, Martin ; Ballheimer, Viktor ; Wille, Frank ; Weber, Mike ; Qiao, Linan ; Droste, Bernhard
Static and dynamic calculation approaches for mechanical design assessment of type B packages for radioactive material transport - 10193 (2010)
Komann, Steffen ; Neumann, Martin ; Ballheimer, Viktor ; Wille, Frank ; Weber, Mike ; Qiao, Linan ; Droste, Bernhard
Beurteilungsmethoden für Transport- und Lagerbehälter mit erhöhten metallischen Reststoffanteilen - Behälterbruchsicherheitsuntersuchungen und Entwicklung eines KONRAD-Referenzprüfstandfundamentes (2009)
Zencker, Uwe ; Weber, Mike ; Qiao, Linan ; Menzel, Martin ; Droste, Bernhard
Sicherheitstechnische Analyse von Transport- und Lagerbehältern aus Gusseisen mit erhöhten metallischen Reststoffanteilen mittels Fallversuchen (2007)
Zencker, Uwe ; Qiao, Linan ; Weber, Mike ; Kovacs, Oliver ; Droste, Bernhard
Dynamic finite element analyses of a HLW transport cask with polyurethane impact limiters in 9m drop tests (2007)
Qiao, Linan ; Wieser, Günter ; Zencker, Uwe ; Droste, Bernhard
Application limits of low-ductile cast iron for radioactive waste containers (2007)
Zencker, Uwe ; Qiao, Linan ; Weber, Mike ; Kovacs, Oliver ; Droste, Bernhard
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