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  • Articles: DFG German National Licenses  (39)
  • 2005-2009  (39)
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  • Articles: DFG German National Licenses  (39)
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Years
Year
  • 11
    Electronic Resource
    Electronic Resource
    Bone Formation Based on the Turing Model under Compressed Loading Condition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 1011-1016 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this paper, the iBone (Imitation Bone) model which is coupled with Turingreaction-diffusion system and FEM, is used. The numerical simulation of bone forming process byconsidering the osteoclasts and osteoblasts process are conducted. The results shown, that the bonemass is increased with increase of the initial load value, then fibula and femur bones are obtainedrespectively by keeping the required bone forming value. The different bone shapes are obtained bychanging the both bone keeping value and the compressing force value. When set larger bone keepingvalue by keeping larger constant compressing force value, bone shape as a pipe with hole just likefemur, when set smaller bone keeping value by keeping the smaller constant compressing force value,it is close to solid pillar as like fibula
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.1011.pdf
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  • 12
    Electronic Resource
    Electronic Resource
    Study on Ductile Fracture Including Shear-Lip Fracture under Mixed Mode Loading Condition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 23-28 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Dimple fracture tests are conducted under mode I and mixed mode lading conditions.Dimple fracture zone and shear-lip fracture zone are observed by scanning electron microscopeprecisely. It is found that crack growth direction is affected largely by the change of loadingcondition. It is also found that the differences of fracture pattern between mid-plane and at freesurface are very large. Void diameter and crack growth direction are measured. Numericalsimulation is conducted to simulate fracture tests in three-dimensional field. Gurson’s constitutiveequation is used and large deformation analyses are conducted. It is assumed that void nucleation iscontrolled by both plastic strain and stress. Numerical results are compared with those ofexperiments. It is found that results of numerical simulation agree well with those of experimentqualitatively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.23.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Computer Simulation of the Formation of γ-Precipitates in Nickel-Based Superalloys (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 815-820 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Recent 3-Dimensional Atom Probe (3DAP) experimental observations showed theformation of spherical γ-precipitates at a central region of γ’ phases in nickel based superalloys. The γprecipitates should give a significant effect to the material strength. Whereat, in this work, we firstdeveloped a simulation technique for the investigation of the formation of γ-precipitates in γ’ phases,which is based on a combination of an Embedded Atom Method (EAM) interatomic potentialdesigned for Molecular Dynamics (MD) and the kinetic lattice Monte Carlo (KLMC) method. As ademonstration of the KLMC simulation, the formation of the L12 structure was simulated from aninitial state with randomly distributed aluminum atoms (25at.%Al). Finally, the γ’ phase with the L12structure is formed in the entire simulation volume. To understand the fundamental mechanism of theformation of the L12 structures, the binding energies between a pair of aluminum atoms in a nickelsingle crystal were calculated using MD method. The result gave a clear picture of the mechanism.The stability of the γ-precipitate was also investigated using the MD method. Finally, the formation ofγ-precipitates was simulated using the KLMC method. The dependence of the formation on thetemperature condition is discussed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.815.pdf
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  • 14
    Electronic Resource
    Electronic Resource
    Molecular Dynamics Simulation of Interaction between Screw Dislocation and Copper Precipitate in Iron (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 895-900 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper provides the results of the MD simulations of the interaction between a screwdislocation and a copper precipitate in iron. From the results, the screw dislocation has an attractiveinteraction with the copper precipitate. Also, the dependence of the Critical Resolved Shear Stress(CRSS) for the screw dislocation to break away from the copper precipitate on the size of theprecipitate and temperature is studied. Finally, the CRSS obtained by the MD simulations ismodeled statistically using a Russel-Brown model. Then we found that an addition of the Peierlsstress, which is calculated by the MD simulations, to the Russel-Brown model gives a goodprediction of the CRSS
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.895.pdf
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  • 15
    Electronic Resource
    Electronic Resource
    Computer Simulation of Irradiation Growth in Zirconium (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 889-894 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper describes the computer simulation of irradiation growths induced by neutronirradiations in zirconium using a combination of Molecular Dynamics (MD) and Kinetic Monte Carlo(KMC) methods. First, we performed the MD simulation of the displacement cascade on a defectcluster to study the interaction between the defect cluster and the displacement cascade. The MDsimulations provide a lot of information on the amount of the defect production and the subsequentmorphological change in the defect cluster. The results are used to make simple models that describethe nature of the displacement cascade overlap on the defect clusters. The models are thenimplemented into the KMC simulation code to extend the length- and time-scale of the simulation,which allows us to evaluate directly the defect cluster accumulations during a long-term irradiation.The irradiation growth strain resulting from the defect cluster accumulations is simply evaluated, andcompared to an available experimental data. The comparison suggests that the displacement cascadeoverlap plays an important role on the irradiation growth, and, consequently, the KMC method withthe simple models must be appropriate for the simulations of the irradiation growth
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.889.pdf
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  • 16
    Electronic Resource
    Electronic Resource
    〈i〉In Vitro〈/i〉 Osteoclast Differentiation of Bone Marrow Cells on Hydroxyapatite/Collagen Self-Organized Bone-Like Nanocomposite Disk (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 396-398 (Oct. 2008), p. 449-452 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Osteoclast differentiation of bone marrow cells on hydroxyapatite/collagen self-organized bone-like nanocomposite (HAp/Col) disk in vitro was evaluated by coculture of mouse bone marrow cells with mouse osteoblasts with or without addition of osteoclastic inducers, 1,25-Dihydroxyvitamin D3 and 1 µM prostaglandin E2. Dentine slice and tissue culture polystyrene were used as controls. Good osteoclastic differentiation at day 7 were observed among the bone marrow cells cultured on the HAp /Col disk and controls with osteoclastic inducers. On the contrary, osteoclastic differentiation was observed only for marrow cells cultured on the HAp/Col disk. Nano- and micro- structures as well as chemical and mechanical properties have a potential to control cell differentiation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/58/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.396-398.449.pdf
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  • 17
    Electronic Resource
    Electronic Resource
    Dimple Fracture Simulation under Mixed Mode Loading Condition (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 757-760 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Dimple fracture under mixed mode loading condition is studied experimentally andnumerically. By the mixed mode loading, it is found that fracture surface becomes much rougherthan that of mode I fracture. It is also found that ductile fracture growth direction deviates from theoriginal plane. It becomes clear that there are two factors affecting ductile fracture processes, one ismixed mode ratio and another is thickness effect. Three-dimensional finite element analyses areconducted to study effects of these factors. For the simulation of ductile fracture, Gurson’sconstitutive equation is used with large deformation theory. These numerical results agree withexperimental observation very well qualitatively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.757.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Fatigue Crack Growth Simulation by Using S-Version FEM (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 385-387 (July 2008), p. 761-764 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Fatigue crack growth under mixed mode loading conditions is simulated using S-versionFEM (Superposition FEM, S-FEM). By using S-FEM technique, only local mesh should bere-meshed and it becomes easy to simulate crack growth. By combining with re-meshing technique,local mesh is re-meshed automatically, and curved crack path is modeled easily
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.385-387.761.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Preparation of the Hydroxyapatite/Collagen Three-Dimensional Scaffold from its Membrane (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 431-434 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Effect of osteogenic activities of MG63 on the HAp/Col membrane was examined at day10 and 14 by reverse-transcript and real-time polymerase chain reactions. Osteogenic activities ofMG63 were upregulated by culture them on the HAp/Col membrane in comparison to those ontissue culture polystyrene. The novel three-dimensional HAp/Col scaffold was prepared from theHAp/Col wavy membrane. The cylindrical HAp/Col scaffold was successfully prepared andindicated at least 2.5-times higher compressive strength and Young's modulus compared to theprevious HAp/Col composites. The novel scaffold could be useful for regenerative medicine
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.431.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Parallel Computing for Wave Propagation Analysis Based on Cellular Automaton (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 571-576 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: We have proposed a cell based parallel computing system using a cellular automatonmodel. The proposed system is designed by object-oriented technique to realize extensibility for parallel cellular automaton model. Because the system needs only information of model as cells which are represented by pixel and voxel mesh, model generation is very easy from any data formats. We implement several applications, which are 1-D life game, 2-D life game, 2-D diffusion, 2-D parallel diffusion, 2-D wave propagation, 3-D wave propagation and 3-D parallel wave propagation on the system. Status of cells is updated by adjacent status of cells. In other worth, behavior of system is completely specified in terms of a local relation. Cells can hold many properties to represent its status. Cellular automata system can calculate physical phenomena and discrete problem like a life game simultaneously. We present some results of a physical analysis and discrete analysis, and discuss effectiveness and parallel efficiency of proposed system
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.571.pdf
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