TY - CONF A1 - Baer, Wolfram A1 - Klingbeil, Dietmar T1 - Entwicklung einer Key Curve-Methode für Gusseisen mit Kugelgraphit bei dynamischer Beanspruchung T2 - 37. MPA-Seminar - Werkstoff- & Bauteilverhalten in der Energie- & Anlagentechnik CY - Stuttgart, Deutschland DA - 2011-10-06 KW - Dynamic fracture mechanics KW - Crack resistance curve KW - Single specimen technique KW - Key curve PY - 2011 SP - 35.1 EP - 35.19 AN - OPUS4-24618 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Baer, Wolfram A1 - Bösel, Dieter A1 - Eberle, Arno A1 - Klingbeil, Dietmar T1 - Determination of dynamic crack resistance of ductile cast iron using the compliance ratio key curve method KW - Dynamic crack resistance curve KW - Ductile cast iron KW - Single-specimen method KW - Key curve KW - Compliance ratio method PY - 2010 DO - https://doi.org/10.1016/j.engfracmech.2009.06.015 SN - 0013-7944 SN - 1873-7315 VL - 77 SP - 374 EP - 384 PB - Elsevier Science CY - Kidlington AN - OPUS4-20822 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Baer, Wolfram A1 - Bösel, Dieter A1 - Eberle, Arno A1 - Klingbeil, Dietmar ED - Jaroslav Pokluda, ED - Petr Lukás, ED - Pavel Sandera, ED - Ivo Dlouhý, T1 - On the development of key curve methods for the determination of dynamic crack resistance curves of ductile cast iron (DCI) T2 - 17th European Conference on Fracture (ECF17) - Multilevel Approach to Fracture of Materials, Components and Structures CY - Brno, Czech Republic DA - 2008-09-02 KW - Dynamic crack resistance curve KW - Key curve method KW - Ductile cast iron PY - 2008 SN - 978-80-214-3692-3 SP - 492 EP - 498 PB - VUTIUM Brno AN - OPUS4-17909 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Klinger, Christian A1 - Mehdianpour, Milad A1 - Klingbeil, Dietmar A1 - Bettge, Dirk A1 - Häcker, Ralf A1 - Baer, Wolfram T1 - Failure analysis on collapsed towers of overhead electrical lines in the region Münsterland (Germany) 2005 N2 - End of November 2005 strong south-west wind and heavy snowfall were predominant in the region Münsterland, north-western part of Germany. This led to accretion of a considerable quantity of wet snow to overhead electrical lines in form of snow rolls on the conductors. Eighty-two transmission towers failed catastrophically, most of them by buckling, however some by brittle fracture. As a consequence nearly 250,000 people have been cut off from electrical power supply for several days with major media attention. This paper describes the forensic analysis in order to investigate the failure cause. Therefore extensive materials investigations, mechanical testing of original components and specimens thereof, estimations for the real wind and snow loads and their combinations, structural analyses as well as detailed evaluations on the basis of previous investigations, literature and regulations were conducted. It was revealed that some of the examined components were manufactured from Thomas steel which was partially in embrittled condition. The investigated towers fulfilled the design codes valid at the time of erection. However the present line loads of the wet snow rolls on the conductors exceeded by far the ones given in the design codes valid at that time. The load case leading to failure was reconstructed by the derived positions of loads mainly caused by unequal and asymmetric distribution of snow rolls on left and right electrical system. The loads and corresponding stresses acting on the structure before failure were estimated. By comparison with the fracture forces from mechanical testing of original members of the collapsed tower the component that primarily failed was localised. The primary fracture occurred on a diagonal member under tension made of Thomas steel which was weakened by embrittlement. The failure cause was a combination of heavy weather conditions (storm, approx. 0 °C and wet snowfall leading to heavy snow rolls on conductors), asymmetric loading conditions and the usage of Thomas steel which was partially embrittled. Finally, recommendations for avoiding future failures are given. KW - Transmission towers KW - Thomas steel KW - Embrittlement KW - Snow loads KW - Ice loads PY - 2011 DO - https://doi.org/10.1016/j.engfailanal.2011.07.004 SN - 1350-6307 SN - 1873-1961 VL - 18 IS - 7 SP - 1873 EP - 1883 PB - Elsevier Science Publ. CY - Oxford AN - OPUS4-24517 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klingbeil, Dietmar T1 - Development of a Key Curve Method fo Ductile Cast Iron at Dynamic Loading T2 - 37th MPA-Seminar "Materials and Components Behaviour in Energy & Plant Technology" CY - Stuttgart, Germany DA - 2011-10-06 PY - 2011 AN - OPUS4-24455 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Baer, Wolfram A1 - Klingbeil, Dietmar T1 - Werkstoffprüfung bei Hochgeschwindigkeitsbeanspruchung KW - Werkstofftechnik KW - Hochgeschwindligkeitsbeanspruchung KW - Crash PY - 2003 DO - https://doi.org/10.1002/maco.200390134 SN - 0947-5117 SN - 1521-4176 VL - 54 IS - 8 SP - 612 EP - 617 PB - Wiley-VCH Verl. CY - Weinheim AN - OPUS4-2860 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Klingbeil, Dietmar A1 - Eberle, Arno A1 - Baer, Wolfram A1 - Wossidlo, Peter A1 - Häcker, Ralf ED - François, D. ED - Pineau, A. T1 - The calculation of dynamic JR-curves from 2D and 3D finite element analyses of a charpy test using a rate-dependent damage model T2 - Charpy Centenary Conference CY - Poitiers, France DA - 2001-01-02 PY - 2001 SN - 0-08-043970-5 SN - 1566-1369 N1 - Serientitel: ESIS publication – Series title: ESIS publication IS - 30 SP - 403 EP - 410 PB - Elsevier CY - Amsterdam AN - OPUS4-1928 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Baer, Wolfram A1 - Klingbeil, Dietmar ED - Fuentes, M. T1 - Experimental and numerical investigations of the failure behaviour of components by application of fracture and damage mechanics T2 - 13th European Conference on Fracture CY - San Sebastián, Spain DA - 2000-09-06 PY - 2000 SN - 0-08-043699-4 SN - 1566-1369 N1 - Serientitel: ESIS publication – Series title: ESIS publication IS - 26 SP - 1(?) EP - 8(?) PB - Elsevier CY - Amsterdam AN - OPUS4-840 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Baer, Wolfram A1 - Müller, Karsten A1 - Wossidlo, Peter A1 - Klingbeil, Dietmar T1 - Dynamic fracture toughness behaviour of ductile cast iron with respect to structural integrity assessment N2 - Modern structural integrity assessment procedures in the field of nuclear related technology incorporate fracture mechanical concepts. Therefore, they inevitably require the availability of both, loading parameters as well as material characteristics in terms of fracture mechanical quantities. Especially in case of dynamic loading conditions, the methods for the determination of the loading parameters need further improvement and there is a lack of material characteristics as well. In Germany, ductile cast iron (DCI) is used for heavy-sectioned casks for radioactive materials. New developments in cask design and efforts to extend the application limits require further investigations. The present study is part of an ongoing fracture mechanics research programme of BAM which is focused on the systematic mechanical and fracture mechanical material characterisation of DCI materials under dynamic loading conditions. In this study, results of fracture mechanics investigations on ductile cast iron from an original DCI container with a wide variety of microstructure under dynamic loading conditions in the temperature range from -50 °C to +22 °C are presented. Large scale as well as small scale single edge crack bend specimens SE(B) with thicknesses of 140 mm and 15 mm, respectively were tested. Furthermore, it is reported on the results of a finite element simulation of the dynamic large scale fracture mechanics tests. Strength and deformation characteristics were determined in dynamic tensile tests. They are discussed with respect to the influence of pearlite content and test temperature. The material specific experimental difficulties in the determination of reliable dynamic crack initiation toughness values of DCI are outlined. T2 - 17th International Conference on Structural Mechanics in Reactor Technology ; SMiRT 17 CY - Prague, Czech Republic DA - 2003-08-17 KW - Dynamic fracture toughness KW - Ductile cast iron KW - Structural integrity KW - Component KW - Specimen geometry KW - Testing KW - Loading rate KW - Test temperature KW - Microstructure KW - Graphite morphology KW - Crack initiation toughness KW - Analysis procedure KW - Finite element simulation KW - Fracture mechanics PY - 2003 IS - G04-4 SP - 1 EP - 8 CY - Prague AN - OPUS4-2856 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Klingbeil, Dietmar T1 - Investigations on the Dynamic Facture Toughness Behaviour of Modular Cast Iron T2 - 14th European Conference on Fravture, ECF CY - Kraków, Poland DA - 2002-09-09 PY - 2002 AN - OPUS4-6177 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -