TY - CONF A1 - Eberle, Arno A1 - Klingbeil, Dietmar A1 - Schicker, Johannes T1 - Die Berechnung dynamischer JR-Kurven aus der FE-Simulation des Kerbschlagbiegeversuchs unter Einbeziehung eines geschwindigkeitsabhängigen Schädigungsmodells T2 - 29. Tagung des DVM-Arbeitskreises Bruchvorgänge CY - Stuttgart, Germany DA - 1997-02-25 PY - 1997 N1 - Serientitel: DVM-Bericht – Series title: DVM-Bericht IS - 229 SP - 325 EP - 334 PB - DVM CY - Berlin AN - OPUS4-34624 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Komann, Steffen A1 - Kiyak, Yusuf A1 - Wille, Frank A1 - Zerbst, Uwe A1 - Weber, Mike A1 - Klingbeil, Dietmar T1 - Assessment of ductile cast iron fracture mechanics analysis within licensing of German transport packages N2 - In the design approval of transport packages for radioactive materials, the mechanical and thermal safety assessment is carried out in Germany by competent authority BAM. In recent years BAM was involved in several licensing procedures of new spent fuel and HLW package designs, where the cask body is of Ductile Cast Iron (DCI). According to IAEA regulations package designs have to fulfill requirements for specific conditions of transport. Type B(U) packages must withstand the defined accident conditions of transport. The temperature range from -40°C up to the operational temperature has to be considered. For the cask material DCI, it is necessary to determine safety against brittle fracture. The German guideline BAM-GGR 007 defines requirements for fracture mechanics of packagings made of DCI. Due to complex cask body structure and the dynamic loading a fracture mechanical assessment by analytical approaches is not always possible. Experience of recent design approval procedures show that the application of numerical calculations are applicable to determine the stresses and stress intensity factors in the cask body. At the first step a numerical analysis has to be done to identify the loading state at the whole cask body. Secondly an analysis of a detail of the cask body is made considering the displacement boundary conditions of the global model. An artificial flaw is considered in this detailed model to calculate the fracture mechanical loading state. The finite element mesh was strongly refined in the area of the flaw. The size of the artificial flaw is based on the ultrasonic inspection acceptance criteria applied for cask body manufacture. The applicant (GNS) developed additional analysis tools for calculation of stress intensity factor and/or J-Integral. The assessment approach by BAM led to the decision to develop own tools to the possibility for independent proof of the results. The paper describes the authority assessment approach for DCI fracture mechanics analysis. The validation procedure incl. the development of own tools is explained. BAM developed a postprocessor to determine the fracture mechanical loads. A horizontal 1 m puncture bar drop test is used to give a detailed description of the assessment procedure. 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 - 1 EP - 10 PB - Omnipress AN - OPUS4-30175 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klingbeil, Dietmar A1 - Svendsen, B. A1 - Reusch, F. T1 - Gurson-based modelling of ductile damage and failure during cyclic loading processes at large deformation N2 - Purpose is the formulation, numerical implementation, identification and application of a material model for ductile damage and failure during cyclic and non-proportional loading. The authors combined a hyperelasticity-based elasto-plastic model for non-linear isotropic as well as kinematic hardening with a modified Gurson model. Evolution strategy helped identify the model parameters for the high-strength steel 10MnMoNi5-5. The simulation of ductile failure in fracture mechanics specimens verified the model with respect to cyclic loading at two temperatures. The simulation of additional fracture mechanics applications validated the model as to the development of residual stresses at the crack tip under cyclic loads. KW - Ductile damage KW - Combined non-linear hardening with cyclic loading KW - Finite-element simulation KW - Material parameter identification KW - Residual stresses PY - 2016 UR - http://www.sciencedirect.com/science/article/pii/S0013794416301138 DO - https://doi.org/10.1016/j.engfracmech.2016.03.023 SN - 0013-7944 VL - 160 SP - 95 EP - 123 PB - Pergamon-Elsevier Science Ltd. CY - Oxford, UK AN - OPUS4-36121 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Eberle, Arno A1 - Klingbeil, Dietmar A1 - Schicker, Johannes T1 - The calculation of dynamic JR-curves from finite element analysis of a Charpy test using a rate-dependent damage model T2 - GJS 97 - German-Japanese seminar CY - Stuttgart, Germany DA - 1997-09-29 PY - 1997 SN - 0029-5493 SP - 75 EP - 87 AN - OPUS4-33828 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Kiyak, Yusuf A1 - Klingbeil, Dietmar A1 - Enderlein, M. A1 - Kuna, M. T1 - Vergleichende Untersuchungen von J-Integralen Postprozessoren bei statischen und dynamischen Rissbeanspruchungen T2 - 41. Tagung des DVM-Arbeitskreises Bruchvorgänge - Bruchmechanische Werkstoff- und Bauteilbewertung: Beanspruchungsanalyse, Prüfmethoden und Anwendungen CY - Wuppertal, Germany DA - 2009-02-17 KW - Dynamisches J-Integral KW - Postprozessor KW - Finite Elemente Methode KW - Dynamic J-Integral KW - Post Processor KW - Finite element method PY - 2009 SN - 1616-4687 SP - 293 EP - 302 AN - OPUS4-32818 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zerbst, Uwe A1 - Ainsworth, R. A. A1 - Beier, H.T. A1 - Pisarski, H. A1 - Zhang, Z. L. A1 - Nikbin, K. A1 - Nitschke-Pagel, T. A1 - Münstermann, S. A1 - Kucharczyk, P. A1 - Klingbeil, Dietmar T1 - Review on fracture and crack propagation in weldments - A fracture mechanics perspective N2 - Welding is one of the most common methods in industrial practice for joining components. Its main advantages are high speed in manufacturing combined with low costs and, usually, a high degree of flexibility, integrity and reliability. Nevertheless, welding is a highly complex metallurgical process and, therefore, weldments are susceptible to material discontinuities, flaws and residual stresses which may lead to structural failure and life time reduction. As a consequence weldments are an important field of fracture mechanics methods although its application is more complex than for homogeneous or non-welded structures. The aim of the paper is to provide an overview on the current state of fracture mechanics application to weldments. It starts by discussing the specific features which any fracture mechanics analysis of weldments has to take into account. Then, the experimental determination of fracture toughness, fatigue crack propagation and tensile properties of weldments is addressed. Finally, the analytical determination of the crack driving force in components and structural integrity assessment approaches for weldments are presented. KW - Weldments KW - Fracture mechanics KW - Fracture toughness KW - Fatigue crack propagation KW - Residual stresses KW - Strength mismatch PY - 2014 DO - https://doi.org/10.1016/j.engfracmech.2014.05.012 SN - 0013-7944 SN - 1873-7315 VL - 132 SP - 200 EP - 276 PB - Elsevier Science CY - Kidlington AN - OPUS4-32819 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klingbeil, Dietmar A1 - Kiyak, Yusuf T1 - Experimentelle und numerische Untersuchungen zum Versagensverhalten von Rohren aus dem Stahl 15NiCuMoNb5 unter Anwendung bruch- und schädigungsmechanischer Konzepte - Teil 2: Schädigungsmechanische Modellierung des Versagensverhaltens T2 - 31. Tagung des DVM-Arbeitskreises Bruchvorgänge - Bruchmechanische Bewertungskonzepte im Leichtbau CY - Darmstadt, Germany DA - 1999-02-24 PY - 1999 SN - 0943-3473 N1 - Serientitel: DVM-Bericht – Series title: DVM-Bericht VL - 231 SP - 237 EP - 248 AN - OPUS4-32874 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klingbeil, Dietmar A1 - Kiyak, Yusuf T1 - Experimentelle und numerische Untersuchungen zum Versagensverhalten von Rohren aus dem Stahl 15 NiCuMoNb 5 unter Anwendung bruch- und schädigungsmechanischer Konzepte - Teil 2: Schädigungsmechanische Modellierung des Versagensverhaltens T2 - 24. MPA-Seminar - Sicherheit und Verfügbarkeit in der Anlagentechnik mit dem Schwerpunkt Integrität und Lebensdauermanagement CY - Hannover, Germany DA - 1998-10-08 PY - 1998 SN - 0943-3473 VL - 2 SP - Beitrag 34 AN - OPUS4-32875 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Bettge, Dirk A1 - Klinger, Christian A1 - Klingbeil, Dietmar A1 - Eberle, Arno T1 - Investigations on the breakdown of a heat recovery steam generator during the initial operation run N2 - Several years ago, in 2003, an industrial heat recovery steam generator in charge of generating process steam in a petrochemical refinery was installed and prepared for initial operation. The steam generator enclosed an evaporator section and a superheater section consisting mainly of bundles of tubes with the longest up to several metres in length. During initial operation test runs severe leakages in the evaporator and superheater modules became noticeable. The test runs were stopped and after disassembly, through-wall cracks in several tube bends were found. BAM was commissioned to carry out the investigations in order to find out the reasons for the failure of the tubes. During on-site inspection a number of relevant damaged components and parts were selected and taken away to the laboratories for detailed inspection. Planned analyses were to comprise metallographic as well as fractographic investigations, mechanical fatigue testing and experimental as well as finite element vibration analyses on specimens and components. Soon, the fracture mechanism was found to be mechanical fatigue due to the fact that the examined fracture surfaces showed the very characteristic beachmarks and colouring patterns. To identify the particular loading and time at which crack initiation and crack propagation took place, experimental and numerical vibration analyses of specific tubes as well as mechanical fatigue tests on tube bends were carried out. Thus it was possible to identify the eigenfrequencies of individual tubes, to estimate the dynamic response as well as the nominal stresses and, hence, experimentally characterise the in-service fatigue strength of the components. Mechanical and thermal comparative tests on tube bends were performed simulating the conditions during the initial test run in order to get crack surfaces comparable to that of the originally damaged components. Thereby it became obvious that the fatigue cracks were initiated by vibrations the tube bundles were exposed to during rail transport from the manufacturer’s site to the place of installation. Based on these results, the damaged components could be repaired or exchanged without modification of the construction, but the rules relating packaging and securing for shipping had to be revised. KW - Steam generator KW - Fatigue failure KW - Vibration analysis KW - Vibrations due to shipping KW - Transport failure KW - Fatigue PY - 2014 DO - https://doi.org/10.1016/j.engfailanal.2013.12.005 SN - 1350-6307 SN - 1873-1961 VL - 43 IS - Special Issue 'A Tribute to Prof. A. Martens' SP - 253 EP - 270 PB - Elsevier Science Publ. CY - Oxford AN - OPUS4-31490 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klingbeil, Dietmar T1 - Adolf Martens - A Pioneer in Materials Testing and Characterisation of the Microstructure - An Overview of his Work on the Occasion of the 100th Anniversary of his Death in 2014 T2 - ECF20 - European Conference on Fracture CY - Trondheim, Norway DA - 2014-06-30 PY - 2014 AN - OPUS4-31127 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -