TY - JOUR A1 - Klobes, Peter A1 - Riesemeier, Heinrich A1 - Meyer, Klaus A1 - Goebbels, Jürgen A1 - Hellmuth, k.-H. T1 - Rock porosity determination by combination of X-ray computerized tomography with mercury porosimetry JF - Fresenius' journal of analytical chemistry N2 - Abstract First results are described of coupling of mercury porosimetry with X-ray computerized tomography (CT) as a new combination technique for rock porosity studies. This technique is suitable for rock samples with a pronounced mercury intrusion-extrusion hysteresis and includes CT measurements before and after mercury intrusion. The entrapped portion of mercury, when the pressure after the intrusion into the rock sample is reduced to 0.1 MPa, serves as a contrast agent in the porous network to localize spatial distribution of rock porosity by CT. The results obtained show that the mercury intrusion and therefore the porosity were quite different for the separate mineral phases. Therefore the combination of mercury porosimetry and computer tomography can give 3-D data on mineral-specific porosity distributions with additional pore size information. In contrast to mercury porosimetry as a single method, results of the combination technique with CT represent a direct visualization of porosity variation and do not depend on any special pore network model. PY - 1997 SN - 0937-0633 VL - 357 IS - 5 SP - 543 EP - 547 PB - Springer CY - Berlin AN - OPUS4-11970 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - GEN A1 - Klobes, Peter A1 - Riesemeier, Heinrich A1 - Meyer, Klaus A1 - Goebbels, Jürgen A1 - Siitari-Kauppi, M. A1 - Hellmuth, K.-H. ED - Gray, W. T1 - Investigation of rock samples using x-ray-microcomputer-tomography before and after mercury intrusion porosimetry T2 - Scientific basis for nuclear waste management XX N2 - A new method for the physical characterization of rock matrices for use in site investigations of nuclear waste repositories has been developed. The method can provide information needed in the assessment of the performance of the geosphere working as a natural barrier retarding the migration of radionuclides by diffusion into the rock matrix. Most conventional methods for the physical characterization of rocks give only bulk information. The combination of mercury porosimetry and computer tomography can give 3-D data on mineral-specific porosity distributions with additional pore size information. Additionally, limits for mineral-specific internal surface areas can be estimated, which is essential for the assessment of water-rock interaction and reactive interaction with radionuclides (sorption). Results of measurements on granitic rock (granodiorite) from the Baltic shield are discussed and integrated with results by complementary methods. T2 - 20th Materials Research Society Symposium on the Scientific Basis for Nuclear Waste Management CY - Boston, MA, USA DA - 1996-12-02 PY - 1997 SN - 1-558-99369-X SN - 0272-9172 N1 - Serientitel: Materials Research Society symposium proceedings – Series title: Materials Research Society symposium proceedings IS - 465 SP - 863 EP - 870 PB - Materials Research Society CY - Pittsburgh, Pa. AN - OPUS4-11971 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hellmuth, K.-H. A1 - Klobes, Peter A1 - Meyer, Klaus A1 - Röhl-Kuhn, Barbara A1 - Siitari-Kauppi, M. A1 - Hartikainen, K. A1 - Hartikainen, J. A1 - Timonen, J. T1 - Matrix retardation studies: size and structure of the accessable pore space in fresh and altered crystalline rock JF - Zeitschrift für geologische Wissenschaften N2 - For the assessment of the barrier function of the geosphere around a nuclear waste repository information about the nature of the accessible rock pore space and internal surfaces is needed. Intact samples of various types of fresh and altered crystalline rocks have been studied by means of mercury intrusion porosimetry and gas adsorption methods using various adsorbates. Furthermore, fluorescence microscopy and scanning electron microscopy was applied and the results were compared with those of impregnation with carbon-l4-polymethylmethacrylate (PMMA). Additional structural information was derived from hydraulic conductivity determinations using helium gas. The investigations were focussed on the reliability of these measurements of intact core samples, the influence of rock composition, structure and geological evolution on the microstructure of the matrices and the consequences regarding the retardation properties of the bedrock. PY - 1995 SN - 0303-4534 VL - 23 IS - 5/6 SP - 691 EP - 706 PB - Verl. für Geowissenschaften Wutzke CY - Berlin AN - OPUS4-11979 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Hellmuth, K.-H. A1 - Siitari-Kauppi, M. A1 - Klobes, Peter A1 - Meyer, Klaus A1 - Goebbels, Jürgen T1 - Imaging and Analyzing Rock Porosity by Autoradiography and Hg-porosimetry/X-ray Computertomography-Applications JF - Physics and chemistry of the earth A N2 - The application of two sets of methods for the characterization of rock pore systems is reported. Both are discussed in the context of other techniques described in the literature. (i) Impregnation with labelled polymethylmethacrylate (PMMA) and autoradiography or direct measurement of the tracer activity allows the investigation of the pattern of the spatial porosity distribution and quantitative measurement of mineral-specific, local porosities, porosity gradients as well as an assessment of hydraulic and diffusive transport properties. (ii) Quantitative information on surface areas within certain pore size ranges can be achieved by combination of mercury intrusion porosimetry with X-ray absorption computertomography. As examples of applications of these techniques, the effects of weathering, alteration, mechanical stress and large diameter coring on the pore network of rocks have been studied. PY - 1999 SN - 1464-1895 VL - 24 IS - 7 SP - 569 EP - 573 PB - Pergamon CY - Oxford AN - OPUS4-11980 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - RPRT A1 - Siitari-Kauppi, M. A1 - Marcos, N. A1 - Klobes, Peter A1 - Goebbels, Jürgen A1 - Timonen, J. A1 - Hellmuth, K.-H. T1 - The Palmottu natural analogue project - physical rock matrix characterisation T2 - Report KW - C14-PMMA-Imprägnations-Radiographie KW - Hg-Porosimetrie KW - Computertomographie KW - Optische Mikroskopie KW - He-Diffusion KW - MMA-Diffusion KW - Wassersättigung PY - 2003 SN - 0783-3555 SP - 1 EP - 63 PB - Espoo AN - OPUS4-5194 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER - TY - JOUR A1 - Kingelhöffer, Hellmuth A1 - Affeldt, E. E. A1 - Bache, M. A1 - Bartsch, M. A1 - Beck, T. A1 - Christ, H. J. A1 - Fedelich, Bernard A1 - Hähner, P. A1 - Holdsworth, S. R. A1 - Lang, K.-H. A1 - McGaw, M. A1 - Olbricht, Jürgen A1 - Remy, L. A1 - Skrotzki, Birgit A1 - Stekovich, S. T1 - Editorial - Special issue: Recent developments in thermo-mechanical fatigue JF - International journal of fatigue N2 - Components in the Aerospace, Power and Automotive engineering sectors are frequently subjected to cyclic stresses induced by thermal fluctuations and mechanical loads. For the design of such components, reliable material property data are required which need to be acquired using well accepted and reproducible test procedures for thermo-mechanical fatigue (TMF) loading. There is limited availability of proven TMF data indicating there is need for further research and testing. The TMF behaviour of materials is often desired to be simulated in models which describe the cyclic stress-strain behaviour, the fatigue life and the cyclic crack growth behaviour. There is a continuous need for the development and amendment of such models. Models can be validated by using materials in industrial applications which are subjected to TMF loading. The 3rd Workshop on Thermo-Mechanical Fatigue was held on 27–29 April 2016 at BAM, Berlin, Germany. The workshop was attended by 90 attendees coming from 17 countries in the world. 38 presentations including five poster presentations were held. The following topics were covered by the workshop: – TMF of materials coated with Thermal Barrier Coatings. – Thermal Gradient Mechanical Fatigue. – TMF crack growth. – TMF + High Cycle Fatigue. – TMF Modelling and Lifetime Prediction. – TMF Properties of steels, cast iron, Al-, Mg- and Ni-alloys – Advanced TMF Testing Techniques. – Industrial Applications. A panel discussion was held regarding the present state of TMF testing standards (ISO and ASTM) and their potential for improvement. The discussion and contributions were summarized and forwarded to the standard committees. The 3rd TMF-Workshop ensured the continuation of international exchange of knowledge providing a forum to present and discuss all recent developments in the field of thermo-mechanical fatigue. The current special issue publishes eleven selected papers of the 3rd TMF-Workshop 2016. The papers were peer reviewed by a number of experts in the Thermo-Mechanical Fatigue sector. I hope you will enjoy reading papers of this special issue. T2 - 3rd International Workshop on Thermo-Mechanical Fatigue (TMF-Workshop 2016) CY - Berlin, Germany DA - 27.04.2016 KW - Fatigue damage KW - Thermo-mechanical fatigue KW - Fatigue life time KW - Life time prediction KW - TMF PY - 2017 DO - https://doi.org/10.1016/j.ijfatigue.2017.02.002 SN - 0142-1123 VL - 99 IS - 2 SP - 215 PB - Elsevier CY - Oxford AN - OPUS4-40895 LA - eng AD - Bundesanstalt fuer Materialforschung und -pruefung (BAM), Berlin, Germany ER -