The Experts below are selected from a list of 182481 Experts worldwide ranked by ideXlab platform

Kazutaka Asabe - One of the best experts on this subject based on the ideXlab platform.

  • Development of Oxide Dispersion Strengthened Ferritic Steels for FBR Core Application, (I)
    Journal of Nuclear Science and Technology, 2012
    Co-Authors: Shigeharu Ukai, Hirokazu Okada, Takanari Okuda, Masayuki Fujiwara, Nishida Toshio, Kazutaka Asabe
    Abstract:

    As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life Core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

  • development of oxide dispersion strengthened ferritic steels for fbr Core Application i improvement of mechanical properties by recrystallization processing
    Journal of Nuclear Science and Technology, 1997
    Co-Authors: Shigeharu Ukai, Toshio Nishida, Hirokazu Okada, Takanari Okuda, Masayuki Fujiwara, Kazutaka Asabe
    Abstract:

    As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life Core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

Shigeharu Ukai - One of the best experts on this subject based on the ideXlab platform.

  • Development of Oxide Dispersion Strengthened Ferritic Steels for FBR Core Application, (I)
    Journal of Nuclear Science and Technology, 2012
    Co-Authors: Shigeharu Ukai, Hirokazu Okada, Takanari Okuda, Masayuki Fujiwara, Nishida Toshio, Kazutaka Asabe
    Abstract:

    As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life Core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

  • Development of Oxide Dispersion Strengthened Steels for FBR Core Application, (II)
    Journal of Nuclear Science and Technology, 2012
    Co-Authors: Shigeharu Ukai, Toshio Nishida, Takanari Okuda, T Yoshitake
    Abstract:

    Previously manufactured oxide dispersion strengthened (ODS) ferritic steel cladding tubes had inferior internal creep rupture strength in the circumferential hoop direction. This unexpected feature of ODS cladding tubes was substantially ascribed to the needle-like grain structure aligned with the forming direction. In this study, the grain morphology was controlled by using the martensite transformation in ODS martensitic steels to produce an equi-axial grain structure. A major improvement in the strength anisotropy was successfully achieved. The most effective yttria addition was about 1 mass% in improving the strength of the ODS martensitic steels. A simple addition of titanium was particularly effective in increasing the strength level of the ODS martensitic steels to that of ODS ferritic steels.

  • development of oxide dispersion strengthened ferritic steels for fbr Core Application i improvement of mechanical properties by recrystallization processing
    Journal of Nuclear Science and Technology, 1997
    Co-Authors: Shigeharu Ukai, Toshio Nishida, Hirokazu Okada, Takanari Okuda, Masayuki Fujiwara, Kazutaka Asabe
    Abstract:

    As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life Core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

Takanari Okuda - One of the best experts on this subject based on the ideXlab platform.

  • Development of Oxide Dispersion Strengthened Ferritic Steels for FBR Core Application, (I)
    Journal of Nuclear Science and Technology, 2012
    Co-Authors: Shigeharu Ukai, Hirokazu Okada, Takanari Okuda, Masayuki Fujiwara, Nishida Toshio, Kazutaka Asabe
    Abstract:

    As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life Core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

  • Development of Oxide Dispersion Strengthened Steels for FBR Core Application, (II)
    Journal of Nuclear Science and Technology, 2012
    Co-Authors: Shigeharu Ukai, Toshio Nishida, Takanari Okuda, T Yoshitake
    Abstract:

    Previously manufactured oxide dispersion strengthened (ODS) ferritic steel cladding tubes had inferior internal creep rupture strength in the circumferential hoop direction. This unexpected feature of ODS cladding tubes was substantially ascribed to the needle-like grain structure aligned with the forming direction. In this study, the grain morphology was controlled by using the martensite transformation in ODS martensitic steels to produce an equi-axial grain structure. A major improvement in the strength anisotropy was successfully achieved. The most effective yttria addition was about 1 mass% in improving the strength of the ODS martensitic steels. A simple addition of titanium was particularly effective in increasing the strength level of the ODS martensitic steels to that of ODS ferritic steels.

  • development of oxide dispersion strengthened ferritic steels for fbr Core Application i improvement of mechanical properties by recrystallization processing
    Journal of Nuclear Science and Technology, 1997
    Co-Authors: Shigeharu Ukai, Toshio Nishida, Hirokazu Okada, Takanari Okuda, Masayuki Fujiwara, Kazutaka Asabe
    Abstract:

    As to an oxide dispersion strengthened (ODs) ferritic steel cladding as the promising candidate for long-life Core materials of the fast reactors, previously fabricated claddings had inferior internal creep rupture strength in hoop direction and inferior formability due to less ductility. Those unexpected features of ODs claddings are substantially ascribed to the needle-like grain structure excessively elongated along the forming direction. Controlling the grain morphology by applying the recrystallization method to ODs ferritic steel made possible to improve those inferior features. The ranges of Y2O3 and excessive oxygen contents for possibly cold-rolling and recrystallization were revealed, and the effects of extruded temperature and deformation texture on recrystallization characteristics were evaluated. The recrystallized ODs ferritic steel showed superior internal creep rupture strength and ductility. It was demonstrated from those results that cold-rolling manufacturing of ODs cladding at room tem...

Peter Pharow - One of the best experts on this subject based on the ideXlab platform.

  • a model driven approach for the german health telematics architectural framework and security infrastructure
    International Journal of Medical Informatics, 2007
    Co-Authors: Bernd Blobel, Peter Pharow
    Abstract:

    Shared care concepts such as managed care and continuity of care are based on extended communication and cooperation between different health professionals or between them and the patient respectively. Health information systems and their components, which are very different in their structure, behavior, data and their semantics as well as regarding implementation details used in different environments for different purposes, have to provide intelligent interoperability. Therefore, flexibility, portability, and future orientation must be guaranteed using the newest development of model driven architecture. The ongoing work for the German health telematics platform based on an architectural framework and a security infrastructure is described in some detail. This concept of future proof health information networks with virtual electronic health records as Core Application starts with multifunctional electronic health cards. It fits into developments currently performed by many other developed countries.

  • MIE - A model-driven approach for the german health telematics architectural framework and the related security infrastructure.
    Studies in health technology and informatics, 2005
    Co-Authors: Bernd Blobel, Peter Pharow
    Abstract:

    Shared care concepts such as managed care and continuity of care are based on extended communication and co-operation either between different health professionals, or between them and the patient. Health information systems and their components, which are very different in their structure, their behaviour, the respective data, and their semantics as well as regarding implementation details used in different environments for different purposes, have to provide intelligent interoperability. Therefore, flexibility, portability, and future-orientation must be guaranteed using the newest development of model driven architecture. The ongoing work for the German health telematics platform based on an architectural framework and a security infrastructure is described in some detail. This concept of future-proof health information networks with virtual Electronic Health Records as Core Application starts with multifunctional Electronic Health Cards. It fits into developments currently performed by many other developed countries in Europe and beyond.

Christophe Bouvet - One of the best experts on this subject based on the ideXlab platform.

  • damage mechanics modelling of the shear nonlinear behavior of nomex honeycomb Core Application to sandwich beams
    Mechanics of Advanced Materials and Structures, 2020
    Co-Authors: Juan De Dios Rodriguezramirez, Bruno Castanié, Christophe Bouvet
    Abstract:

    In this work, a modelling strategy based on damage mechanics is presented for Nomex honeycomb Core. The proposed approach is based on the experimental analysis presented by the authors in [1] and consists of the decoupled modelling of the buckling and collapse of cells for the HRH-78 Nomex honeycomb Core with two damage parameters. The proposed approach shows good agreementwith the experimental tests. The computational cost is low, proving the efficacy of this technique. This strategy may avoid using full 3D models that mimic the real shape and is a step toward a full compression/shear nonlinear model for honeycomb Core.

  • Experimental and numerical analysis of the shear nonlinear behaviour of Nomex honeycomb Core: Application to insert sizing
    Composite Structures, 2018
    Co-Authors: Juan De Dios Rodriguez-ramirez, Bruno Castanié, Christophe Bouvet
    Abstract:

    This work is a contribution to the understanding of the nonlinear shear behaviour caused by cell postbuckling in Nomex honeycomb Cores. First, an experimental benchmark study was made of different designs for the shear testing of honeycomb Cores. Then, several test specimens were fabricated and tested, a 3D DIC system being used to measure and record the displacements. An Artificial Neural Network (ANN) was also used to identify the onset of bucking and collapse of the cells. The influence of the overall boundary conditions of shear tests on the buckling of the cells is presented both experimentally and numerically. The reversibility and test procedure results suggest that it may be possible to allow the shear strength to be increased by up to 35% under certain conditions.