TY - CONF A1 - Heckel, Thomas A1 - Zerbst, Uwe T1 - Einfluss von Save Life- und Schadenstoleranzkonzepten auf die ZfP von Eisenbahnradsatzwellen T2 - DGZfP-Jahrestagung 2013 CY - Dresden, Germany DA - 2013-05-06 PY - 2013 SN - 978-3-940283-49-8 IS - Mi.1.A.1 SP - 1 EP - 7 AN - OPUS4-28620 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zerbst, Uwe A1 - Madia, Mauro T1 - IBESS - ein DFG/AiF-Clusterprojekt: Integrale Bruchmechanische Ermittlung der Schwingfestigkeit von Schweißverbindungen T2 - 45. Tagung des DVM-Arbeitskreises Bruchvorgänge CY - Berlin, Germany DA - 2013-02-19 PY - 2013 AN - OPUS4-27595 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zerbst, Uwe A1 - Madia, Mauro T1 - Anwendung bruchmechanischer Werkstoffkennwerte in der Bauteilbewertung. Grundlagen, spezielle Aspekte, Regelwerke T2 - Fortbildungsseminar des DVM AK Bruchvorgänge CY - Berlin, Germany DA - 2013-02-18 PY - 2013 AN - OPUS4-27597 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zerbst, Uwe A1 - Beretta, S. A1 - Köhler, G. A1 - Lawton, A. A1 - Vormwald, M. A1 - Beier, H.T. A1 - Klinger, Christian A1 - Cerný, I. A1 - Rudlin, J. A1 - Heckel, Thomas A1 - Klingbeil, Dietmar T1 - Safe life and damage tolerance aspects of railway axles - A review N2 - The paper gives an overview on safe life and damage tolerance methods applied to railway axles. It describes failure scenarios due to fatigue crack initiation and propagation. Besides common aspects of design, specific features such as corrosion and impact damage from flying ballast are discussed which may reduce the fatigue strength of axles during service. Potential effects of non-metallic inclusions from the steel manufacturing process are addressed in the context of the very high number of loading cycles railway axles are designed for. With respect to damage tolerance general lines of fracture mechanics residual lifetime analyses are introduced. More specific discussion is provided on aspects such as the threshold value of fatigue crack propagation and reliability aspects of non-destructive inspection. KW - Railway axle KW - Safe life design KW - Damage tolerance KW - Fatigue strength KW - Fatigue crack propagation KW - Inspection intervals PY - 2013 U6 - https://doi.org/10.1016/j.engfracmech.2012.09.029 SN - 0013-7944 SN - 1873-7315 VL - 98 SP - 214 EP - 271 PB - Elsevier Science CY - Kidlington AN - OPUS4-27779 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zerbst, Uwe A1 - Madia, Mauro ED - Yu, S. ED - Feng, X.-Q. T1 - Fracture mechanics model for predicting fracture strength of metallic alloys containing large second phase particles N2 - An analytical fracture mechanics model for predicting the finite life fatigue strength of components is presented which Combines a number of well established and newly developed approaches such as Murakami’s and McEvily's approach for describing the transient behaviour of crack closure of short cracks, the analytical (long) crack closure function of Newman, the R6 procedure modified by a method for improving the ligament yielding correction proposed by the authors and other elements. Basic assumption is the preexistence of initial flaws such that the crack initiation or nucleation stage is small and can be neglected. The application of the model is demonstrated for small tension plates of aluminium Al 5380 H321 with artificial initial defects generated by FIB technology, the size of which was fixed on the basis of fractographic investigations on broken, smooth specimens. T2 - ICF13 - 13th International conference on fracture CY - Beijing, China DA - 16.06.2013 KW - Fatigue strength KW - S-N curve KW - Fracture mechanics KW - Crack propagation KW - Short cracks PY - 2013 SN - 978-988-12265-2-5 SP - 1 EP - 12 AN - OPUS4-29537 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Zerbst, Uwe A1 - Hübner, P. T1 - Bruchmechanik an Schweißverbindungen T2 - Gemeinschaftssitzung DVS-AGQ12, DVM AG Bruchmechanik an Schweißverbindungen und IBESS, BAM CY - Berlin, Germany DA - 2013-11-26 PY - 2013 AN - OPUS4-29501 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klingbeil, Dietmar A1 - Zerbst, Uwe A1 - Klinger, Christian ED - Yu, S. ED - Feng, X.-Q. T1 - Safe life and damage tolerance concepts of railway axles N2 - On July 9, 2008 a high speed train derailed in Cologne main Station, Germany at a low speed because an axle was broken. Fortunately, the derailment happened at a low speed so that nobody was injured. The reason for the broken axle was investigated and it turned out that most likely large inclusions located shortly undemeath the surface in a T-transition were the origin of the final crack. Basing on that result, a systematic investigation on existing safety assessments of railway axles was performed. This results in an analysis of the production process of axles and in a critical review of existing of existing assessments. Improvements and future developments are outlined. T2 - ICF13 - 13th International conference on fracture CY - Beijing, China DA - 16.06.2013 KW - Railway axles KW - Derailment KW - Service loading fatigue KW - Inclusions KW - Safety assessment PY - 2013 SN - 978-988-12265-2-5 SP - 1 EP - 10 AN - OPUS4-29651 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Zerbst, Uwe A1 - Klinger, Christian A1 - Klingbeil, Dietmar T1 - Structural assessment of railway axles - A critical review N2 - The safety assessment of railway axles is based on a two-stage approach: fatigue strength design and regular inspections which, in terms of a general safety philosophy refer to safe-life and damage tolerance concepts. Starting with a recent failure case, a broken axle of a German high speed train, a discussion is presented on issues of both safety levels. These include ideas for finite life design, the treatment of in-service effects on the fatigue strength due to flying ballast damage and corrosion pits, the effect of corrosion on fatigue crack initiation and propagation, potential effects of non-metallic inclusions in steels, the way to detect them by quality control measures and reliability aspects of non-destructive testing with respect to the detection of fatigue cracks. Proposals are made how the safety level could be further improved. KW - Railway axles KW - Safe life design KW - Damage tolerance design KW - Non-destructive testing KW - Flying ballast impact KW - Corrosion KW - Non-metallic inclusions PY - 2013 UR - http://www.sciencedirect.com/science/article/pii/S1350630712002531 SN - 1350-6307 SN - 1873-1961 VL - 35 IS - Special issue on ICEFA V- Part 1 SP - 54 EP - 65 PB - Elsevier Science Publ. CY - Oxford AN - OPUS4-29715 LA - eng 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 - CONF A1 - Zerbst, Uwe A1 - Klinger, Christian T1 - Anmerkungen zur Auslegung und zum sicheren Betrieb von Radsatzwellen aus der Sicht von Betriebsfestigkeit und Bruchmechanik N2 - Die Sicherheit von Radsatzwellen beruht gegenwärtig auf zwei Säulen: der Schwingfestigkeitsauslegung und periodischen Inspektionen. Ausgehend von einem Schadensfall, der gebrochenen ICE 3-Welle von Köln, 2008, sollen ausgewählte Aspekte beider Säulen diskutiert und Vorschläge zur weiteren Verbesserung gemacht werden. Diese betreffen u.a. Fragen einer Betriebszeitbegrenzung, Veränderungen der Schwingfestigkeit während des Betriebs infolge von Korrosion und Steinschlag, den Einfluss von Korrosion auf Schwingrissinitiierung und -fortschritt, den potentiellen Einfluss nichtmetallischer Einschlüsse auf die Schwingfestigkeit, die Möglichkeiten sie im Rahmen der Qualitätssicherung zu detektieren sowie Fragen der Bruchmechanik und der Zuverlässigkeit zerstörungsfreier Schwingriss-Prüfverfahren im Rahmen eines Konzepts regelmäßiger Inspektionen. T2 - 40. Tagung des DVM-Arbeitskreises Betriebsfestigkeit CY - Herzogenaurach, Germany DA - 09.10.2013 KW - Radsatzwellen KW - Schwingfestigkeit KW - Sichere Lebensdauer KW - Schadenstoleranz KW - Zerstörungsfreie Inspektion KW - Korrosion KW - Steinschlag KW - Nichtmetallische Einschlüsse KW - Railway axles KW - Fatigue strength KW - Safe life design KW - Damage tolerance design KW - Non-destructive inspection KW - Corrosion KW - Flying ballast impact KW - Non-metallic inclusions PY - 2013 N1 - Serientitel: DVM-Bericht – Series title: DVM-Bericht VL - 140 SP - 69 EP - 80 AN - OPUS4-29458 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -