TY - CONF A1 - Ellouz, Manel A1 - Völzke, Holger A1 - Protz, Christian T1 - Container safety assessment for the disposal of non-heat generating radioactive waste in the KONRAD repository T2 - 53rd INMM Annual meeting CY - Orlando, FL, USA DA - 2012-07-15 PY - 2012 SP - 1 EP - 9(?) AN - OPUS4-27217 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Gründer, Klaus-Peter A1 - Kadoke, Daniel A1 - Protz, Christian A1 - Zencker, Uwe T1 - Optical 3D methods in steel sheet container drop test analysis N2 - In the context of a research project at BAM various drop tests and material as well as component investigations have to be performed with respect to steel sheet container drop test analysis. Both, experimental and computational methods (Finite Element Analysis) are involved. Among electrical sensor techniques optical measurement methods capable of dynamic and static 3D deformation analysis are applied. On the one hand this includes the Projected Fringes Method which provides a virtual digital round-about model of the actual package surface shape. On the other hand there is the Stereo Photogrammetry used for high speed imaging of points rich in contrast and permanently fixed to the container while dropping. Technical features of both methods are discussed. Diverse measurement results are compared with those of alternative experimental techniques as well as numerical simula-tions. T2 - OPTO 2013 - 11th International conference on optical technologies for sensing and measurement CY - Nürnberg, Germany DA - 14.05.2013 KW - Steel sheet container KW - Drop test KW - Numerical simulation KW - Optical digitization KW - High speed stereo photogrammetry PY - 2013 SN - 978-3-9813484-3-9 DO - https://doi.org/10.5162/opto2013/o4.2 N1 - Serientitel: AMA Conferences – Series title: AMA Conferences IS - 4.2 SP - 74 EP - 78 AN - OPUS4-28559 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Protz, Christian T1 - Explicit Finite Element Analyses of Drop Tests with Thin-walled Steel Sheet Containers for the Konrad Repository N2 - Alternatively to experimental drop tests, the mechanical safety analyses of containers for final disposal of radioactive waste with negligible heat generation in the German Konrad repository may be carried out by numerical simulations within the safety assessment procedure. In the past, safety assessments for thin-walled steel sheet containers have been done exclusively by prototype tests and unfavorable drop scenarios were determined by engineering judgment. So far, reliable numerical simulations do not exist. Therefore, a research project was started to develop numerical simulation approaches for drop test analyses and to determine existing safety margins. Comparisons of experimental and numerical results confirm that the Finite Element (FE) model represents the general mechanical behavior of the steel sheet container sufficiently. Simulations have been used to determine an unfavorable drop scenario resulting in large deformation and damage. This paper presents the investigations carried out as well as the further development of the FE model in terms of damage mechanics. T2 - ASME 2015 Pressure Vessels & Piping Conference CY - Boston, MA, USA DA - 19.07.2015 PY - 2015 AN - OPUS4-33760 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Protz, Christian A1 - Völzke, Holger A1 - Ellouz, Manel A1 - Kasparek, Eva Maria A1 - Zencker, Uwe A1 - Grünewald, Heike A1 - Gründer, Klaus-Peter T1 - ConDrop - Development of numerical simulation approaches for drop test analyses of steel sheet containers N2 - According to disposal requirements, containers for radioactive waste have to withstand drop tests at defined conditions corresponding to the considered package category. Alternatively to prototype drop tests, numerical methods can be applied, if they are suitable and sufficiently verified. In this context BAM (Federal Institute for Materials Research and Testing) started the research project ConDrop to develop a reliable Finite Element (FE) model describing the mechanical behavior of a box shaped steel container during a drop test and to determine unfavorable scenarios within future safety assessment procedures of comparable steel sheet containers. In a first step, a FE model of a representative steel sheet container was developed. Flat bottom-side drop tests with the unloaded container from different heights onto an IAEA target were simulated. In order to verify the numerical calculations, two drop tests with an unloaded KONRAD Type V steel sheet container were carried out at the BAM drop test facility. Both drop tests (flat drop from heights 0.4 m and 5 m onto the unyielding IAEA target) had been documented by various extensive measurements: strain and deceleration measurement by means of strain gauges and accelerometers, high-speed video as well as optical 3D-measurements using the method of projected fringes in combination with close range photogrammetry. The measured strain and deceleration values are presented and compared with the calculated results. T2 - 53rd INMM Annual meeting CY - Orlando, FL, USA DA - 15.07.2012 KW - INMM 53rd annual meeeting PY - 2012 SP - 1 EP - 7 AN - OPUS4-26417 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Wieser, Günter A1 - Qiao, Linan A1 - Protz, Christian T1 - Modeling strategies for dynamic finite element cask analyses N2 - 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. T2 - PATRAM 2013 - 17th International symposium on the packaging and transportation of radioactive materials CY - San Francisco, CA, USA DA - 18.08.2013 KW - Structural analysis KW - Dynamic numerical simulation KW - Modeling strategies KW - Discretization KW - Material modeling KW - Boundary conditions KW - Cask load scenarios PY - 2013 SP - Session A, Paper 280, 1 EP - 10 PB - Omnipress AN - OPUS4-30158 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -