TY - CONF A1 - Weber, Mike A1 - Zencker, Uwe A1 - Wolff, Dietmar A1 - Völzke, Holger A1 - Herbrich, Uwe A1 - Nagelschmidt, Sven T1 - Numerical analysis of cask accident scenarios in storage facilities N2 - Existing spent nuclear fuel (SF) and high active waste (HAW) management policies and practices worldwide are the result of past presumptions that sufficient reprocessing and/or disposal capacity would be available in the near term. Consequently, in the past many countries have developed specific solutions for different periods of time due to their individual national nuclear policies. In Germany the concept of dry interim storage in dual purpose metal casks before disposal is being pursued for SF and HAW management and transport and storage licenses have been issued accordingly. The current operation licenses for existing storage facilities have been granted for a storage period of up to 40 years. This concept has demonstrated its suitability for over 20 years so far. Relevant safety requirements have been assessed for the short-term as well as for the long-term for site-specific operational and accidental storage conditions. But in the meantime significant delays in the national repository siting procedure occurred which will make extended storage periods necessary in the future. T2 - PATRAM 2013 - 17th International symposium on the packaging and transportation of radioactive materials CY - San Francisco, CA, USA DA - 18.08.2013 KW - Numerical analysis KW - Interim storage KW - Cask accident scenario PY - 2013 SP - Session H, Paper 202, 1 EP - 9 PB - Omnipress AN - OPUS4-30227 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Mike A1 - Zencker, Uwe A1 - Wolff, Dietmar A1 - Völzke, Holger A1 - Herbrich, Uwe A1 - Nagelschmidt, Sven T1 - Numerical analysis of cask accident scenarios in storage facilities N2 - Mechanical drop test scenarios for Type B (U) packages according to the IAEA regulations have to be carried out onto the so-called “unyielding target” (usually with cask impact limiters) and onto the puncture bar respectively. They are predefined and do not require any further investigation of scenarios that really could happen on transportation routes. Cask accident scenarios in the framework of approval procedures for interim storage sites are derived from a detailed analysis of the handling procedures necessary from arrival of cask at the site to its storing position. In that case, casks are usually handled without impact limiters. Dependent on possible drop heights, drop positions and floor properties, conservative cask accident scenarios are derived for further safety proofs. According to the mechanical assessment concept of the considered approval procedure numerical calculations have to be provided by the applicant to demonstrate mechanical cask safety. Stresses and strains in the cask body as well as in the lid System have to be identified and assessed. Using the example of a 3-mvertical-drop of a transport and storage cask for spent fuel elements onto the floor construction made of damping concrete covered by screed, BAM developed a finite element model. The finite element code ABAQUS/Explicit™ was used. Results of experimental investigations are not available. Therefore parameter studies are necessary to identify the sensitivity of the finite element model to significant Parameters and to verify the finite element models according to the requirements of the Guidelines for the Numerical Safety Analyses for the Approval of Transport and Storage Casks for Radioactive Materials (BAM GGR-008). The paper describes the modeling of the material behavior and attachment of bottom side cask components. Questions concerning the modeling of a crack length limiting reinforcement in the screed layer are discussed. The influence of the mesh density of the screed layer and its strength is considered as well. Finally, the developed finite element model can be used for a numerical safety assessment. It can help to understand the complex mechanisms of the interaction between the cask components and floor construction. T2 - WM2014 Conference CY - Phoenix, Arizona, USA DA - 02.03.2014 KW - Numerical analysis KW - Interim storage KW - Cask accident scenario PY - 2014 SN - 978-0-9836186-3-8 SP - Paper 14541, 1 EP - 12 AN - OPUS4-31516 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Dynamic Fracture Mechanical Safety Assessment of Cask Designs PY - 2002 SN - 0957-476X VL - 13 IS - 3-4 SP - 291 EP - 296 PB - Nuclear Technology Publ. CY - Ashford, Kent AN - OPUS4-2807 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Assessment of dynamically loaded surface cracks in cubic containers T2 - 13th International Conference on Packaging and Transportation of Radioactive Materials (PATRAM 2001) CY - Chicago, IL, USA DA - 2001-09-03 PY - 2001 AN - OPUS4-3336 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Assessment of dynamically loaded cracks in fillets N2 - Practical methods for the safety assessment of postulated crack-like material defects of cubic containers made of ductile cast iron are presented. A formula for the stress intensity factor of a crack in a fillet with a radius from 20 to 200 mm under static load conditions is given. From that, an assessment diagram is derived for the critical depth of a crack in a fillet. The formula may be used to estimate the stress intensity factor of a dynamically loaded crack for special cases. As an application the results of the estimation procedure are compared with the results of a dynamic finite element calculation. T2 - 15th European Conference of Fracture CY - Stockholm, Sweden DA - 2004-08-11 KW - Ductile cast iron KW - Container design KW - Safety assessment KW - Fracture mechanics KW - Dynamic load conditions PY - 2004 UR - http://www.structuralintegrity.eu/pdf/esis/Documents/Conference/ECF/15/Zencker%20U%20et%20al.pdf SP - 1 EP - 8(?) CY - Stockholm AN - OPUS4-3763 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Entwicklung von Beurteilungsmethoden für Transport- und Lagerbehälter mit erhöhten metallischen Reststoffanteilen - Weiterführende Untersuchungen (EBER II) N2 - Der erhöhte Zusatz metallischer Reststoffe aus der Stilliegung und dem Rückbau kerntechnischer Einrichtungen bei der Herstellung von Behältern aus Gusseisen mit Kugelgraphit führt einerseits durch das Recycling zu einer Reduzierung der Menge des endzulagernden radioaktiven Metallschrottes, aber andererseits auch zu einer nachteiligen Beeinflussung sicherheitsrelevanter Werkstoffeigenschaften. Unter den hochdynamischen Beanspruchungsbedingungen der nicht mit Stoßdämpfern ausgerüsteten Behälter liegt die Bruchzähigkeit um mehr als die Hälfte unter dem Mindestwert für die bisher genehmigten Werkstoffqualitäten, was eine Anpassung der sicherheitstechnischen Bewertungsmethoden für Behälter aus Gusseisen mit Kugelgraphit an den neuen Werkstoff erfordert. Im ersten Teil des Projektes EBER wurden dazu die Grundlagen erarbeitet. In diesem zweiten Teil wird die Beanspruchungsanalyse der Behälter weiter vervollkommnet. Die Werkstoffdämpfung wird mittels einer Analyse der Ausbreitung von Spannungswellen im Gusseisen berechnet. Die Behälterstruktur wird genauer als bei den bisherigen Berechnungen in den Modellen abgebildet. Im Mittelpunkt steht die Weiterentwicklung des sicherheitstechnischen Bewertungskonzeptes. Zur Bewertung von rissartigen Werkstofffehlern in geometrisch komplexen Behälterpartien wurden statische und dynamische bruchmechanische nu- merische Berechnungen eines Risses in einer Hohlkehle und in der Mitte einer Behälterwand durchgeführt. Die Berechnungsergebnisse wurden für spezielle Anwendungsfälle verifiziert, für die bereits Lösungen bekannt sind. Die gewonnenen Erkenntnisse wurden in einfach zu handhabende Bewertungsdiagramme umgesetzt. Das sicherheitstechnische Bewertungskonzept wurde schließlich bei einem Fallversuch mit einem rissbehafteten Prototypbehälter definierter Werkstoffqualität überprüft. Eine Minderung der Beanspruchung infolge konstruktiver Verbesserungen (größere Hohlkehlen, Bodenleiste) durch den Behälterkonstrukteur konnte dabei bestätigt werden. KW - Duktiles Gusseisen KW - Transportbehälter KW - Lagerbehälter KW - Fallversuch KW - Spannungsanalyse KW - Sicherheitsbewertung KW - Dynamische Belastung PY - 2002 SP - 1 EP - 70 PB - Bundesanstalt für Materialprüfung CY - Berlin AN - OPUS4-3475 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zencker, Uwe A1 - Clos, R. T1 - Limiting Conditions for Compression Testing of Flat Specimens in the Split Hopkinson Pressure Bar KW - Split Hopkinson pressure bar KW - High strain rate testing KW - Dispersion correction KW - Stress distribution KW - Triaxiality PY - 1999 SN - 0014-4851 SN - 1741-2765 VL - 39 IS - 4 SP - 343 EP - 348 PB - Springer CY - Norwell, Mass. AN - OPUS4-743 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Müller, Karsten T1 - Modern Safety Assessment of Cubic Cast Iron Containers Under Mechanical Impact N2 - In the present study, ductile cast iron from an original DCI container with a wide variety of microstructure was investigated in order to determine the materials fracture toughness under impact loading conditions. Three-point bending specimens with thickness of 140 mm from a cubic DCI container were investigated at elevated loading rates to provide reliable fracture toughness parameters for the assessment procedures. In contrast to static fracture behaviour, the fracture toughness values of thick-walled DCI at higher loading rates show a remarkable reduction with decreasing temperature up to –50 °C and a significant shift of the transition range. The lower bound fracture toughness value used in the BAM DCI safety concept was confirmed for impact loading conditions by these fracture mechanics tests using large specimens. These measurements are relevant to the licensing tests for storage containers without shock absorbers, especially to the assessment of the dynamic behaviour of crack-like defects inside a cask structure under drop test conditions. Using extensive dynamic numerical analyses it could be shown, that for special crack configurations the dynamic crack tip parameter (KI, or J) may be estimated by static formulae even under mechanical impact. These results of the safety assessment were verified according to the German Konrad repository acceptance criteria by a drop test with a cubic waste container with artificial crack-like defects from 5 m height onto a representative storage facility foundation. T2 - 17th International Conference on Structural Mechanics in Reactor Technology ; SMiRT 17 CY - Prague, Czech Republic DA - 2003-08-17 KW - Ductile cast iron KW - Mechanical impact KW - Dynamic fracture KW - Safety assessment KW - Storage containers PY - 2003 IS - G04-4 SP - 1(?) EP - 8(?) CY - Prague AN - OPUS4-2650 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Assessment of dynamically loaded surface cracks in cubic containers T2 - 13th International Conference on Packaging and Transportation of Radioactive Materials ; PATRAM 2001 CY - Chicago, IL, USA DA - 2001-09-03 PY - 2001 IS - CD-ROM PB - PATRAM CY - Chicago, Ill. AN - OPUS4-1889 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Entwicklung von Beurteilungsmethoden für Transport- und Lagerbehälter mit erhöhten metallischen Reststoffanteilen - Abschließende Untersuchungen (EBER III) T2 - 6. KONTEC ; 6. Internationales Symposium "Konditionierung Radioaktiver Betriebs- und Stilllegungsabfälle" ; 6th International Symposium "Conditioning of Radioactive Operational & Decommissioning Wastes" CY - Berlin, Deutschland DA - 2003-03-19 PY - 2003 SN - 3-9806415-6-2 VL - 6 SP - 623 EP - 630 CY - Hamburg AN - OPUS4-2398 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Dynamic Fracture Mechanics Safety Assessment of Cask Designs T2 - 6th International Conference on Radioactive Materials Transport - 2002 CY - Edinburgh, Scotland DA - 2002-11-05 PY - 2002 AN - OPUS4-5747 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Müller, Karsten T1 - Modern Safety Assessment of Cubic Iron Containers Under Mechanical Impact T2 - 17. International Conference on Structural Mechanics in Reactor (SmiRT 17) CY - Prague, Czech Republic DA - 2003-08-17 PY - 2003 AN - OPUS4-5282 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Entwicklung von Beurteilungsmethoden für Transport- und Lagerbehälter mit erhöhten metallischen Reststoffanteilen T2 - KONTEC 2003, 6. International Symposium "Konditionierung radioaktiver Betriebs- und Stillegungsabfälle" / 6. Statusbericht des BMBF "Stillegung und Rückbau kerntechnischer Anlagen", ESTREL CY - Berlin, Germany DA - 2003-03-19 PY - 2003 AN - OPUS4-5280 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Müller, Karsten A1 - Ballheimer, Viktor A1 - Droste, Bernhard A1 - Rödel, Roland A1 - Völzke, Holger A1 - Zencker, Uwe T1 - Die Anwendung der Bruchmechanik im Sicherheitsnachweis von Transportbehältern für die Beförderung radioaktiver Stoffe T2 - 36. Tagung des DVM-Arbeitskreises Bruchvorgänge CY - Köln, Deutschland DA - 2004-02-17 KW - Gusseisen mit Kugelgraphit KW - Bruchmechanischer Sicherheitsnachweis KW - Stoßbeanspruchung KW - Transportbehälter KW - Radioaktive Stoffe KW - Ductile iron KW - Fracture mechanics safety assessment KW - Mechanical impact KW - Transport casks KW - Radioactive material PY - 2004 SN - 0943-3473 IS - 236 SP - 225 EP - 238 PB - DVM CY - Berlin AN - OPUS4-5336 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Development of Assessment Methods for Transport and Storage Containers with Higher Content of Metallic Recycling Material T2 - 14th International Symposium on the Packaging and Transportation of Radioactive Materials (PATRAM 2004) CY - Berlin, Germany DA - 2004-09-20 PY - 2004 AN - OPUS4-4562 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe T1 - Experimentelle und rechnerische Untersuchungen an Endlagerbehältern für radioaktive Stoffe T2 - BAM-Kolloquium CY - Berlin, Germany DA - 2004-10-20 PY - 2004 AN - OPUS4-4568 LA - deu 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 T2 - OPTO 2013 - 11th International conference on optical technologies for sensing and measurement CY - Nürnberg, Germany DA - 2013-05-14 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 - Zencker, Uwe A1 - Qiao, Linan A1 - Kasparek, Eva Maria A1 - Völzke, Holger T1 - Modeling of cylindrical casks under horizontal drop test conditions N2 - Cylindrical casks made of ductile cast iron are used for transport, interim storage and final disposal of radioactive waste in Germany. A basic design criterion is the ability to withstand a horizontal drop without impact Binders onto a foundation representative for the real ground of a storage facility. The increasing use of more cost-effective material compositions requires optimized cask geometries to reduce stresses and strains in the cask structure. For example, a non-uniform wall thickness was introduced to reduce maximum wall bending stresses. As a result, the load characteristics changed from line load to point load at bottom and lid side under horizontal drop fest conditions. Hereby, the position of highest stress inside the structure has shifted significantly. This was the reason for a systematic investigation of effects caused by small design changes or small variations of fest conditions. It led to a better understanding of the positions of high local stresses, their time history and maximum value for cylindrical casks under horizontal drop test conditions. Hence, the paper presents the lessons learnt from modeling and simulating such scenarios considering an impact without limiters onto a realistic target. T2 - 14th International high-level radioactive waste management conference CY - Albuquerque, New Mexico, USA DA - 28.04.2013 KW - Cylindrical cask KW - Ductile cast iron KW - Numerical simulation KW - Horizontal drop test KW - Storage facility KW - Concrete foundation PY - 2013 SN - 978-1-62748-644-6 SP - 1114 EP - 1119 (Paper # 6862) PB - Omnipress AN - OPUS4-28529 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Assessment of dynamically loaded cracks in fillets T2 - 15th European Conference of Fracture - Advanced Fracture Mechanics for Life and Safety Assessments CY - Stockholm, Sweden DA - 2004-08-11 PY - 2004 AN - OPUS4-5186 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Entwicklung von Beurteilungsmethoden für Transport- und Lagerbehälter mit erhöhten metallischen Reststoffanteilen - Ein zusammenfassender Überblick T2 - 7. Internationales Symposium "Konditionierung radioaktiver Betriebs- und Stilllegungsabfälle" (KONTEC 2005) CY - Berlin, Deutschland DA - 2005-04-20 KW - Duktiles Gusseisen KW - Behälterdesign KW - Sicherheitstechnische Bewertung KW - Bruchmechanik KW - Dynamische Belastungsbedingungen PY - 2005 SP - 797 EP - 804 PB - KONTEC CY - Hamburg AN - OPUS4-11550 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Development of assessment methods for transport and storage containers with a higher content of recycled metal KW - Ductile iron KW - Container design KW - Safety assessment KW - Fracture mechanics KW - Dynamic loading conditions PY - 2004 SN - 1746-5095 SN - 1746-5109 SN - 0957-476X VL - 15 IS - 3-4 SP - 215 EP - 221 PB - Ramtrans Publ. CY - Ashford AN - OPUS4-11551 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Wieser, Günter A1 - Völzke, Holger T1 - Numerische Analyse eines ungedämpften Behälterabsturzes aus 0,3 m Höhe T2 - Jahrestagung Kerntechnik 2008 CY - Hamburg, Germany DA - 2008-05-27 PY - 2008 AN - OPUS4-16329 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Qiao, Linan A1 - Zencker, Uwe A1 - Wieser, Günter A1 - Völzke, Holger ED - Topping, B. H. V. ED - M. Papadrakakis, T1 - Numerical safety assessment of a transport and storage cask for radioactive materials without impact limiters by the 0.3m drop test onto an unyielding target T2 - 9th International Conference on Computational Structures Technology (CST2008) CY - Athens, Greece DA - 2008-09-02 KW - Impact KW - Simulation KW - Cask KW - Safety KW - Drop KW - Foundation KW - Unyielding KW - Target PY - 2008 SN - 978-1-905088-23-2 IS - Paper 21 SP - 1 EP - 10 PB - Civil Comp Press CY - Kippen AN - OPUS4-18340 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Qiao, Linan A1 - Zencker, Uwe A1 - Wieser, Günter A1 - Völzke, Holger T1 - Numerische Analyse eines ungedämpften Behälterabsturzes aus 0,3 m Höhe T2 - Jahrestagung Kerntechnik CY - Hamburg, Germany DA - 2008-05-27 KW - Duktiles Gusseisen KW - Behälterdesign KW - Sicherheitsanalyse KW - Dynamische Beanspruchungsbedingungen KW - Finite-Element-Berechnung PY - 2008 SP - 380 EP - 383 PB - INFORUM-Verl. u. Verwaltungsges. CY - Berlin AN - OPUS4-18314 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Development of Assessment Methods for Transport and Storage Containers with Higher Content of Metallic Recycling Material T2 - 14th International Symposium on the Packaging and Transportation of Radioactive Materials CY - Berlin, Germany DA - 2004-09-20 KW - Ductile iron KW - Container design KW - Safety assessment KW - Fracture mechanics KW - Dynamic loading conditions PY - 2004 UR - http://www.iaea.org/inis/collection/NCLCollectionStore/_Public/37/088/37088594.pdf IS - 235 SP - 1(?) EP - 7(?) PB - BAM CY - Berlin AN - OPUS4-11478 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Weber, Mike A1 - Kovacs, Oliver A1 - Droste, Bernhard T1 - Application limits of low-ductile cast iron for radioactive waste containers T2 - PATRAM 2007, 15th International Symposium on the Packaging and Transportation of Radioactive Materials CY - Miami, Florida, USA DA - 2007-10-21 KW - Ductile iron KW - Container design KW - Safety assessment KW - Fracture mechanics KW - Dynamic loading conditions PY - 2007 IS - Session B, Paper #97 SP - 1 EP - 8 PB - Institute of Nuclear Materials Management AN - OPUS4-18399 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Qiao, Linan A1 - Wieser, Günter A1 - Zencker, Uwe A1 - Droste, Bernhard T1 - Dynamic finite element analyses of a HLW transport cask with polyurethane impact limiters in 9m drop tests T2 - PATRAM 2007, 15th International Symposium on the Packaging and Transportation of Radioactive Materials CY - Miami, Florida, USA DA - 2007-10-21 KW - Ductile iron KW - Cask design KW - Safety assessment KW - Impact limiter KW - Dynamic loading conditions PY - 2007 IS - Session E, Paper #60 SP - 1 EP - 7 PB - Institute of Nuclear Materials Management AN - OPUS4-18400 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Weber, Mike A1 - Kovacs, Oliver A1 - Droste, Bernhard T1 - Sicherheitstechnische Analyse von Transport- und Lagerbehältern aus Gusseisen mit erhöhten metallischen Reststoffanteilen mittels Fallversuchen T2 - KONTEC 2007 CY - Dresden, Deutschland DA - 2007-03-21 KW - Behälterdesign KW - Bruchmechanik KW - Duktiles Gusseisen KW - Dynamische Belastungsbedingungen KW - Sicherheitstechnische Bewertung PY - 2007 SP - 869 EP - 875 PB - Gesellschaft für technische Kommunikation mbH / Kerntechnische Gesellschaft CY - Dresden AN - OPUS4-14712 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Weber, Mike A1 - Qiao, Linan A1 - Kovacs, Oliver A1 - Droste, Bernhard T1 - Sicherheitstechnische Analyse von Transport- und Lagerbehältern aus Gusseisen mit erhöhten metallischen Reststoffanteilen mittels Fallversuchen T2 - 8. Internationales Symposium "Konditionierung radioaktiver Betriebs- und Stilllegungsbfälle" einschließlich 8. Statusbericht des BMBF "Stilllegung und Rückbau kerntechnischer Anlagen" CY - Dresden, Germany DA - 2007-03-21 PY - 2007 AN - OPUS4-14708 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Wieser, Günter A1 - Droste, Bernhard T1 - Dynamic finite element analyses of a HLW transport cask with polyrethane impact limiters in 9m drop test T2 - PATRAM 2007, The 15th International Symposium on the Packaging and Transportation of Radioactive Material CY - Miami, FL, USA DA - 2007-10-21 PY - 2007 AN - OPUS4-16190 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Weber, Mike A1 - Kovacs, Oliver A1 - Droste, Bernhard T1 - Application limits of low-ductile cast iron for radioactive waste containers T2 - PATRAM 2007, The 15th International Symposium on the Packaging and Transportation of Radioactive Material CY - Miami, FL, USA DA - 2007-10-21 PY - 2007 AN - OPUS4-16191 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Qiao, Linan A1 - Droste, Bernhard T1 - Entwicklung von Beurteilungsmethoden für Transport- und Lagerbehälter mit erhöhten metallischen Reststoffanteilen - Ein zusammenfassender Überblick T2 - Tagungsband KONTEC 2005 7. Internationales Symposium "Konditionierung radioaktiver Betriebs- und Stilllegungsabfälle" einschließlich 7. Statusbericht des BMBF "Stilllegung und Rückbau kerntechnischer Anlagen" CY - Berlin, Germany DA - 2005-04-20 PY - 2005 AN - OPUS4-7371 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Qiao, Linan A1 - Wieser, Günter A1 - Zencker, Uwe A1 - Droste, Bernhard T1 - Dynamische Analyse eines mit Stoßdämpfern ausgerüsteten Gefahrgutbehälters beim 9 m - Fallversuch T2 - 18. ABAQUS-Benutzerkonferenz 2006 CY - Erfurt, Deutschland DA - 2006-09-18 KW - Gefahrgutbehälter KW - Fallversuch KW - Finite-Elemente-Methoden PY - 2006 SP - 1 EP - 11(?) PB - ABAQUS CY - Aachen AN - OPUS4-13207 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe T1 - Methoden der numerischen Nachweisführung für mechanische und thermodynamische Beanspruchungen T2 - 1. RAM-Behältersicherheitstage 2009 CY - Berlin-Horstwalde, Germany DA - 2009-03-26 PY - 2009 AN - OPUS4-19175 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Völzke, Holger A1 - Wieser, Günter A1 - Zencker, Uwe A1 - Droste, Bernhard T1 - Mechanical and thermal safety analyses and demonstrations for cubic DCI multipurpose containers PY - 1997 SN - 0957-476X VL - 8 IS - 3-4 SP - 247 EP - 252 PB - Nuclear Technology Publ. CY - Ashford, Kent AN - OPUS4-21664 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zencker, Uwe A1 - Zeisler, Peter A1 - Droste, Bernhard T1 - Dynamic fracture mechanics assessments for cubic ductile cast iron containers PY - 2000 SN - 0957-476X VL - 11 IS - 1-2 SP - 113 EP - 118 PB - Nuclear Technology Publ. CY - Ashford, Kent AN - OPUS4-21857 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Wille, Frank A1 - Droste, Bernhard A1 - Zencker, Uwe A1 - Komann, Steffen T1 - Reflektion der verkehrsrechtlichen Bauartprüfung des CASTOR HAW 28M aus Sicht der zuständigen Behörde BAM T2 - Jahrestagung Kerntechnik 2010 CY - Berlin, Deutschland DA - 2010-05-04 KW - Bauartprüfung KW - Fallprüfungen KW - Transportbehälter KW - FEM PY - 2010 SP - 1 EP - 5 CY - Berlin AN - OPUS4-21241 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Weber, Mike A1 - Wille, Frank T1 - Finite element mesh design of a cylindrical cask under puncture drop test conditions N2 - Transport casks for radioactive materials have to withstand the 9 m drop test, 1 m puncture drop test and dynamic crush test with regard to the mechanical requirements according to the IAEA regulations. The safety assessment of the package can be carried out on the basis of experimental investigations with prototypes or models of appropriate scale, calculations, by reference to previous satisfactory safety demonstrations of a sufficiently similar nature or a combination of these methods. Computational methods are increasingly used for the assessment of mechanical test scenarios. However, it must be guaranteed that the calculation methods provide reliable results. Important quality assurance measures at BAM are given concerning the preparation, run and evaluation of a numerical analysis with reference to the appropriate guidelines. Hence, a successful application of the finite element method requires a suitable mesh. An analysis of the 1 m puncture drop test using successively refined finite element meshes was performed to find an acceptable mesh size and to study the mesh convergence using explicit dynamic finite element codes. The finite element model of the cask structure and the puncture bar is described. At the beginning a coarse mesh was created. Then this mesh was refined in two steps. In each step the size of the elements was bisected. The deformation of the mesh and the stresses were evaluated dependent on the mesh size. Finally, the results were extrapolated to an infinite fine mesh or the continuous body, respectively. The uncertainty of the numerical solution due to the discretization of the continuous problem is given. A safety factor is discussed to account for the uncertainty. The calculation results are compared with experimental data from a puncture drop test with a half-scale model of a cylindrical cask. This paper supports the convergence studies of the Task Group on Computational Modeling for Explicit Dynamics reporting to the ASME BPV Code Working Group on Design Methodology. T2 - PATRAM 2010 - 16th International symposium on the packaging and transport of radioactive materials CY - London, UK DA - 2010-10-03 KW - IAEA puncture drop test KW - Numerical analysis KW - Verification KW - Explicit dynamics PY - 2010 SP - 1 EP - 8 (Session T45 / Paper 219) AN - OPUS4-23843 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Neser, A. A1 - Schreiber, D. A1 - Magallanes, J. A1 - Martinez, R. A1 - Zencker, Uwe A1 - Weber, Mike T1 - A material testing program to characterize the concrete behavior under static and dynamic loads N2 - In this paper a comprehensive material testing program is described to characterize a German final repository concrete material (BERB1) subjected to static and dynamic loads. The BERB1 material was developed und specified by the German Bundesanstalt für Materialforschung und -prüfung (BAM) for targets used for drop tests according to the KONRAD requirements. The testing consists of three concurrent laboratory experimental programs performed in the USA. An extensive preliminary testing program in Germany was performed to assure the required concrete specifications during fabrication and curing. The first set of data is the static basic material test program consisting of structural tests to quantify macroscopic concrete properties under quasi-static loads. Cubic and cylindrical specimens are investigated under this effort. The second set of test data is from the static complete material test program, where cylindrical concrete specimens are subjected to a variety of quasi-static axial and radial stress and strain paths using a high-pressure hydraulic tri-axial chamber. The material is characterized for confining pressures up to 400 MPa. The third set of data is from the dynamic complete material test program, which uses a modified Split-Hopkinson Pressure Bar to induce dynamic compression and tension waves into cylindrical concrete specimens that generate strain-rates up to 400 s-1. The ensemble of data generated in these experiments provides a complete set of data that effectively describes the behavior of this concrete and can be used to develop a constitutive calculation model. In addition, the results of the tests show a significant effect of moisture on the strength and rheology of this concrete for quasi-static pressures greater than 50 MPa. Numerical drop test simulations with the developed constitutive model in the Lagrangian finite element code, LS-DYNA, show good agreement with the experimental results from a BAM research project. T2 - PATRAM 2010 - 16th International symposium on the packaging and transport of radioactive materials CY - London, UK DA - 2010-10-03 KW - Testing program KW - Concrete behavior KW - Static loads KW - Dynamic loads KW - KONRAD acceptance criteria KW - Ductile cast iron cask PY - 2010 SP - 1 EP - 8 (Session T40 / Paper 123) AN - OPUS4-23845 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe T1 - Finite Element Mesh Refinement Study for IAEA Pucture Drop Test T2 - 2012 Pressure Vessels & Piping conference CY - Toronto, Canada DA - 2012-07-15 PY - 2012 AN - OPUS4-26818 LA - deu 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 - TY - THES A1 - Zencker, Uwe T1 - Entwicklung rechnerischer und experimenteller Methoden zur Sicherheitsbewertung von Transport- und Lagerbehältern aus gering duktilem Gusseisen bei Stoßbelastung KW - Gussbehälter KW - Sicherheitsbewertung KW - Bauteilfehler KW - Stoßbelastung PY - 2013 UR - http://d-nb.info/1045218227 SN - 978-3-86012-468-0 IS - 13 SP - 1 EP - 142 PB - TU Bergakademie Freiberg AN - OPUS4-30129 LA - deu 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 T2 - 17th International Symposium on the Packaging and Transportation of Radioactive Materials (PATRAM 2013) CY - San Francisco, CA, USA DA - 2013-08-18 PY - 2013 AN - OPUS4-29171 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Daum, Werner A1 - Gründer, Klaus-Peter A1 - Kadoke, Daniel A1 - Protz, Christian A1 - Zencker, Uwe T1 - Optical 3D dynamic deformation analysis of a ram container during a drop test T2 - 30th Danubia-Adria symposium on advances in experimental mechanics CY - Primosten, Croatia DA - 2013-09-25 KW - Steel sheet container KW - Drop test KW - Numerical simulation KW - Optical digitization KW - High speed stereo photogrammetry PY - 2013 SN - 978-953-7539-17-7 SP - 45 EP - 46 AN - OPUS4-29414 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Weber, Mike A1 - Völzke, Holger A1 - Zencker, Uwe A1 - Hauer, Katharina A1 - Herz, A. A1 - Kreienmeyer, M. T1 - Aufbau eines Aufprallfundamentes mit reproduzierbaren Eigenschaften für Baumusterprüfungen von Abfallbehältern für das Endlager Konrad N2 - Abgeleitet aus den in Teil 3 der „Systemanalyse Konrad“ definierten Lastannahmen für den „untertägigen Anlagenbereich“ müssen Verpackungen, die der Abfallbehälterklasse I (ABK I) mit dem zusätzlichen Merkmal der störfallfesten (sf) Verpackung oder der ABK II zugeordnet werden, gemäß den „Endlagerungsbedingungen, Endlager Konrad“, nach einem „…Fall aus 5 m Höhe auf eine unnachgiebige Unterlage…“ bestimmten Anforderungen genügen. Eine nähere Beschreibung der Prüfeinrichtung sowie die Definition detaillierter Anforderungen an das Aufprallfundament erfolgen in der „Produktkontrolle, Endlager Konrad“: „Die Prüfeinrichtung, bestehend aus einer Hebeeinrichtung und einem Fundament ist so zu gestalten, dass der Fall des Prüfmusters in jeder beliebigen Aufprallorientierung aus 5 m Höhe, gemessen von der Unterkante des Prüfmusters zum Fundament, möglich ist. Das Fundament ist aus Beton der Mindestgüte B 35 herzustellen und muss so beschaffen und verankert sein, dass keine Zerstörung in zahlreiche kleinere Bruchstücke erfolgt und keine horizontale Verschiebung des Fundamentes oder seiner Teile auftritt. Maße und Masse des Fundaments müssen so beschaffen sein, dass der Einfluss des Baugrundes unter dem Fundament auf den Aufprallwiderstand vernachlässigbar ist.“ Im Rahmen der Bauartprüfung für Behälter zur Endlagerung radioaktiver Abfälle mit zu vernachlässigender Wärmeentwicklung im Endlager Konrad wird die Bundesanstalt für Materialforschung und -prüfung (BAM) von der Bundesgesellschaft für Endlagerung (BGE) als Sachverständige hinzugezogen und ist in der Regel auch mit der Durchführung der notwendigen Fallprüfungen auf dem Testgelände Technische Sicherheit der BAM (BAM TTS) einschließlich der Bereitstellung der benötigten Prüfeinrichtungen sowie des regelkonformen Aufprallfundamentes beauftragt. Der Prozess, beginnend von der Gewährleistung einer von allen Beteiligten als gültig bewerteten Fallprüfung bis hin zur abschließenden Bewertung und Interpretation der Versuchsergebnisse erfordert dabei u.a. eine sorgfältige Planung und Fertigung der für das Endlager Konrad repräsentativen Fundamentplatte und deren Ankopplung an einen Untergrund im Sinne der „Regulations for the Safe Transport of Radioactive Material“ wie er zum Beispiel auf den beiden Fallversuchsanlagen des BAM Testgelände Technische Sicherheit (BAM TTS) zur Verfügung steht. Um diese Anforderungen zu erfüllen muss zum einen der Erhalt der Integrität der Fundamentplatte beim Fallversuch durch eine geeignete Auswahl und kraftflussgerechte Anordnung der Stabstahl-Bewehrung sowie deren Verankerung garantiert und damit eine unzulässige Energieaufnahme durch Risse sowie eine unzulässige „… Zerstörung (der Fundamentplatte) in zahlreiche kleinere Bruchstücke …“, wie in [3] gefordert, verhindert werden. Außerdem ist zu gewährleisten, dass der Beton die Anforderungen an die vorgeschriebene Mindestgüte bzw. -festigkeit zum Zeitpunkt der Fallprüfung erfüllt, die Betonfestigkeit jedoch zur Vermeidung unnötig verschärfter Prüfrandbedingungen eine zu definierende Obergrenze nicht überschreitet. Ausgehend von dem 2009 im Rahmen der KONTEC veröffentlichten Wissensstand präsentiert die BAM im vorliegenden Beitrag die wesentlichen Ergebnisse der zwischenzeitlich bei der Planung und Durchführung von zahlreichen Fallprüfungen gewonnenen Erfahrungen bzgl. Spezifikation und Fertigung der für die Fallversuche notwendigen Fundamentplatten sowie deren Anbindung an den Untergrund. Neben den immer wieder notwendigen Anstrengungen zur Gewährleistung einer im Rahmen der Definition korrekten Betondruckfestigkeit am Tag der Fallprüfung wird die Anpassung der Bewehrungsführung an verschiedene Fallpositionen diskutiert. Zur Ergänzung des gültigen Regelwerks entsteht parallel zu diesem Dokument eine Fachnotiz, in der BGE und BAM die Vorgaben und Spezifikationen zur regelwerkskonformen Herstellung und Montage von Fundamentplatten für Fallprüfungen im Rahmen der Behälterbauartprüfungsverfahren für das Endlager Konrad zusammenfassen und veröffentlichen werden. Diese Fachnotiz soll detaillierte Vorgaben und Spezifikationen zur Planung, Beauftragung, Herstellung und abschließenden Prüfung eines solchen Fundamentes und dessen Anbindung an den Untergrund enthalten. Damit soll allen beteiligten Organisationen wie Antragstellern, Sachverständigen und BGE ein langfristig verlässlicher Leitfaden im Hinblick auf die Durchführung anforderungsgerechter Fallprüfungen unter definierten und reproduzierbaren Randbedingungen im Rahmen der Bauartprüfungsverfahren für das Endlager Konrad an die Hand gegeben werden. T2 - KONTEC 2021 CY - Dresden, Germany DA - 25.08.2021 KW - Aufprallfundament KW - Endlager Konrad KW - Fallprüfung PY - 2021 SP - 1 EP - 10 CY - Dresden AN - OPUS4-53372 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Gaddampally, Mohan Reddy A1 - Völzke, Holger T1 - Fracture Mechanics Analysis of Spent Fuel Claddings during Long-Term Dry Interim Storage N2 - The prevention of brittle fracture of spent fuel claddings during long-term dry interim storage is based on experimental investigations, numerical analyses and assessment methods for predicting the mechanical behavior and determining limiting conditions. The ring compression test (RCT) is an established experimental method for characterizing cladding material. Test results for various high-burnup pressure water reactor zirconium-based fuel cladding alloys (e.g., ZIRLO®, M5®) are publicly available. To reduce the effort associated with irradiated samples in hot cells, it is helpful to perform studies on unirradiated surrogate cladding material. Based on such experimental data, load-displacement curves were numerically analyzed for selected cladding materials. In the presence of radial hydrides, a sample may suddenly fail by fracture even at small deformations. Noticeable load drops in the RCT occur associated to unstable crack propagation through the radial hydride network. The failure mechanism is quasi-cleavage in the hydrides and micro-void nucleation, growth, and coalescence in the zirconium matrix, with ductile tearing patches connecting neighboring hydrides. The failure process was simulated by cohesive zones controlled by the fracture energy and the cohesive strength. A modeling approach is presented in which the radial hydride morphology is taken into account. Based on the developed fracture mechanics approach with cohesive zone modeling, not only the deformation behavior but also the failure behavior of irradiated as well as unirradiated claddings with radial hydrides under RCT loading conditions can be adequately described. T2 - 20th International Symposium on the Packaging and Transportation of Radioactive Materials (PATRAM 2022) CY - Juan-les-Pins, France DA - 11.06.2023 KW - Extended Interim Storage KW - Nuclear Fuel Cladding KW - Numerical Failure Analysis KW - Ring Compression Test KW - Spent Fuel Characterization PY - 2023 AN - OPUS4-59147 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kasparek, Eva Maria A1 - Scheidemann, Robert A1 - Zencker, Uwe A1 - Wolff, Dietmar A1 - Völzke, Holger T1 - Effect of dynamic loading on compressional behavior of damping concrete N2 - In drop test scenarios related to assessing and licensing the storage procedure of spent fuel and high active waste, the casks under examination are generally not equipped with impact limiters. Hence, the extent of mechanical stresses in case of an assumed handling accident is largely affected by the ground properties of the reception hall floor in the specific storage facility. Unlike conventional brittle foundation materials, damping concrete performs quite well in such applications as it features high stiffness as well as high energy absorption due to the filler pore volume. However, its damping ability is not sufficiently exploited in current finite element (FE) calculations due to a lack of advanced material models for simulating its impact response. An implementation of qualified concepts that account for plastic, strain rate dependent behavior requires additional information that has to be provided by systematic test series. BAM recently started a research project to generate such data, subsequently to develop and to improve numerical methods for the analysis of impact limiters and damping foundation material and thus to optimize safety assessment tools for the design of transport and storage casks. A major part of this research concerns dynamic compression tests of variably shaped specimens conducted at a servo hydraulic 1MN impact testing machine as well as at a BAM facility for guided drop tests. This presentation focuses 100mm damping concrete cubes deformed vertically at constant rates under different constraint conditions. For example, a special fitting jig was constructed to subject the specimens to multi-axial loading. Thereby a deformation of 60% could be applied. Simulation was conducted by FE code ABAQUS™ based on material models “Concrete damaged plasticity” and “Crushable foam” which both allow defining rate sensitive nonlinear stress-strain relations in compression beyond the classic metal plasticity approach. T2 - PATRAM 2010 - 16th International symposium on the packaging and transport of radioactive materials CY - London, UK DA - 2010-10-03 KW - Damping concrete KW - Strain rate sensitivity KW - Numerical simulation KW - Material model PY - 2010 SP - 1-8 (Thursday-T40-114) AN - OPUS4-23708 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zencker, Uwe A1 - Müller, Karsten A1 - Droste, Bernhard A1 - Rödel, Roland A1 - Völzke, Holger T1 - The Application of Fracture Mechanics to the Safety Assessment of Transport Casks for Radioactive Materials T2 - 14th International Symposium on the Packaging and Transportation of Radioactive Materials (PATRAM 2004) CY - Berlin, Germany DA - 2004-09-20 PY - 2004 AN - OPUS4-4569 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Qiao, Linan A1 - Kasparek, Eva Maria A1 - Völzke, Holger A1 - Zencker, Uwe A1 - Scheidemann, Robert T1 - Development of a finite element model for damping concrete under severe impact loads N2 - 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. T2 - PATRAM 2013 - 17th International symposium on the packaging and transportation of radioactive materials CY - San Francisco, CA, USA DA - 18.08.2013 PY - 2013 SP - Session D, Paper 127, 1 EP - 10 PB - Omnipress AN - OPUS4-29110 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kasparek, Eva Maria A1 - Völzke, Holger A1 - Scheidemann, Robert A1 - Zencker, Uwe T1 - Numerical and experimental investigations of polyurethane foam for use as cask impact limiter in accidental drop scenarios T2 - WM2012 - Waste management conference CY - Phoenix, AZ, USA DA - 2012-02-26 KW - Plasticity KW - Finite elements KW - Material models KW - Rate dependency KW - Temperature dependency KW - Compression tests KW - Drop tests KW - Parameter identification PY - 2012 SN - 978-0-9836186-1-4 N1 - Serientitel: WM Symposia – Series title: WM Symposia IS - Paper 12099 SP - 1 EP - 9 AN - OPUS4-26270 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -