TY - CONF A1 - Lenke, Karoline A1 - Trappe, Volker T1 - Damage evolution in short fibre reinforced polyamide caused by biaxial loading N2 - The multiaxial fatigue damage behaviour of short fibre reinforced polyamide 6 is analysed on injection moulded tube samples. In parallel with the fatigue tests, the damage state is evaluated nondestructively by X-ray refraction analysis which detects inner surfaces by the variation of electron density. By applying X-ray refraction analysis and a model based on by GÜNZEL the micro damage evolution can be separated into fibre matrix debonding and matrix-Micro cracking. T2 - ECCM16 - 16th European conference on composite materials CY - Seville, Spain DA - 22.06.2014 KW - Short fibre reinforced composites KW - Multiaxial loading KW - Non-destructive testing KW - Damage evolution KW - Damage state PY - 2014 SN - 978-84-616-9798-4 N1 - Geburtsname von Lenke, Karoline: Metzkes, K. - Birth name of Lenke, Karoline: Metzkes, K. SP - 1 EP - 8 AN - OPUS4-31042 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Müller, Lars A1 - Schilling, O. A1 - Ballheimer, Viktor A1 - Wille, Frank A1 - Komann, Steffen T1 - Assessment strategy of numerical analyses of RAM package components - 14619 N2 - In Germany current package design safety cases include more and more advanced numerical methods, e. g. finite element analysis (FEA), often in combination with local concepts of strength evaluation of the structure. This approach requires extensive modeling and verification procedures. As a consequence the efforts of authority assessment of design safety analysis increase as well. Only the check of pre- and post-data of numerical calculations is often not sufficient for the safety assessment. On the other hand own analyses of the mechanical problem by performing an Independent numerical modeling and analyzing is not always realizable. Therefore it is necessary to look for optimized procedures of the assessment, without loss of safety. This paper shows possibilities for the assessment strategy of numerical analyses with focus on simple analytical approaches as comparative calculations. Such approaches can be helpful to support evaluation of numerical calculations in the whole assessment procedure. Three examples are considered to Show which possibilities and limits exist to support the assessment of numerical analyses using analytical comparative calculations. Two examples of bolt and lid analysis show the influence of component and boundary stiffness on the results. Thickness to length/width ratios are partially exceeded and only fixed or free boundary conditions can be analyzed analytical. Nevertheless These analytical approaches can help to evaluate the numerical results for the assessment. The example of a trunnion demonstrates the limits of analytical approaches. The trunnion shows a complex deformation behavior and local stresses. A single basic theory isn’t matching and a construct of several approaches is not useable for calculations of local stresses. Therefore numerical calculations during assessment are necessary. Analytical approaches are not always purposeful but often effective to reduce the effort of assessment for numerical analysis of complex and safety relevant components of RAM packages. T2 - WM2014 Conference CY - Phoenix, Arizona, USA DA - 02.03.2014 PY - 2014 SN - 978-0-9836186-3-8 SP - Paper 14619, 1 EP - 14 AN - OPUS4-31047 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Musolff, André A1 - Quercetti, Thomas A1 - Droste, Bernhard A1 - Müller, Karsten A1 - Gründer, Klaus-Peter T1 - Experimental investigation of RAM packages impact limiters - 14256 N2 - In context with new cask designs and their approval procedure the experimental testing of impact limiters under drop test conditions becomes more and more important in order to assess the damage mechanics behavior and safety margins for validation reasons. In recent years various designs of impact limiters have been tested by the Federal Institute for Materials Research and Testing (BAM) within specific component testing and particularly with regard to type B package design approval procedures. The paper focuses on the experimental realization of impact limiter tests and presents implemented measurement techniques to determine the amount of deformation and to explain the impact behavior by means of photogrammetric metrology and 3-d fringe projection method, high-speed motion analysis and adjusted deceleration measurements. T2 - WM2014 Conference CY - Phoenix, Arizona, USA DA - 02.03.2014 KW - Drop test KW - Impact limiters KW - RAM packages KW - Measurement methods PY - 2014 SN - 978-0-9836186-3-8 SP - Paper 14256, 1 EP - 10 AN - OPUS4-31050 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Pohl, Rainer A1 - Kreutzbruck, Marc A1 - Commandeur, Colin A1 - Pelkner, Matthias T1 - Development of adapted GMR-probes for automated detection of hidden defects in thin steel sheets N2 - Thin steel sheets with a thickness of 0.3 mm and less are the base materials of many everyday life products (cans, batteries, etc.). Potential inhomogeneities such as non-metallic inclusions inside the steel can lead to a rupture of the sheets when it is formed into a product such as a beverage can. Therefore, there is a need to develop automated NDT techniques to detect hidden defects and inclusions in thin sheets during production. For this purpose Tata Steel Europe and BAM, the Federal Institute for Materials Research and Testing (Germany), collaborate in order to develop an automated NDT-system. Defect detection systems have to be robust against external influences, especially when used in an industrial environment. In addition, such a facility has to achieve a high sensitivity and a high spatial resolution in terms of detecting small inclusions in the μm-regime. In a first step, we carried out a feasibility study to determine which testing method is promising for detecting hidden defects and inclusions inside ferrous thin steel sheets. Therefore, two methods were investigated in more detail – magnetic flux leakage testing (MFL) using giant magneto resistance sensor arrays (GMR) as receivers [1,2] and eddy current testing (ET). The capabilities of both methods were tested with 0.2 mm-thick steel samples containing small defects with depths ranging from 5 μm up to 60 μm. Only in case of GMRMFL-testing, we were able to detect parts of the hidden defects with a depth of 10 μm trustworthily with a SNR better than 10 dB. Here, the lift off between sensor and surface was 250 μm. On this basis, we investigated different testing scenarios including velocity tests and different lift offs. In this contribution we present the results of the feasibility study leading to first prototypes of GMR-probes which are now installed as part of a demonstrator inside a production line. T2 - Review of Progress in Quantitative Nondestructive Evaluation CY - Minneapolis, MN, USA DA - 26.07.2015 KW - GMR KW - NDT PY - 2016 DO - https://doi.org/10.1063/1.4940464 VL - 1706 SP - Article Number: 020018 PB - Amer institute physics CY - Melville, New York, USA AN - OPUS4-36100 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Oelsner, Günter ED - Ailor, W. H. T1 - Atmospheric corrosion testing in the Federal Republic of Germany T2 - International Symposium on Atmospheric Corrosion CY - Hollywood, FL, USA DA - 05.10.1980 PY - 1982 SN - 0-471-86558-3 SP - 797 EP - 805 PB - Wiley CY - New York AN - OPUS4-36039 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Olschewski, Jürgen A1 - Jordan, R. A1 - Brocks, Wolfgang A1 - Veith, Helmut A1 - Ziebs, Josef T1 - The influence of biaxial loading on fracture toughness - further results T2 - Trans. 7th Int. Conf. on Structural Mechanics CY - Chicago, IL, USA DA - 22.08.1983 PY - 1983 VL - G SP - 225 EP - 232 PB - North Holland Publ. Co. AN - OPUS4-36003 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Veith, Helmut T1 - Microstructural processes prior to and during fatigue softening of structural steels T2 - 2nd International Symposium CY - Mont Gabriel, Canada DA - 30.05.1982 PY - 1983 SP - 385 EP - 396 PB - Springer Netherlands CY - Dordrecht, Netherlands AN - OPUS4-36005 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Rücker, Werner ED - Cakmak, A. S. ED - Abdel-Ghaffar, A. M. T1 - Dynamic interaction of a railroad-bed with the subsoil T2 - Conference on Soil Dynamics and Earthquake Engineering CY - Southampton, UK DA - 13.07.1982 PY - 1982 SP - 435 EP - 448 PB - Balkema CY - Rotterdam AN - OPUS4-36129 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Isecke, Bernd T1 - Schadensfälle an Stahlbetonkonstruktionen infolge korrosiver Beanspruchung T2 - Jahrestagung '83 Werkstoff, Bauteil, Schaden CY - Munich, Germany DA - 09.03.1983 PY - 1983 SP - 63 EP - 70 PB - VDI Verlag CY - Dusseldorf, Germany AN - OPUS4-36217 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - CONF A1 - Isecke, Bernd T1 - Einfluß unterschiedlicher Arten der Vorkorrosion auf die Zähigkeitseigenschaften von Spannstählen T2 - Korrosionsverhalten von Spannstählen CY - Berlin, Germany DA - 07.06.1983 PY - 1983 SP - 13 EP - 15 CY - Berlin, Germany AN - OPUS4-36183 LA - deu AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -