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  • 11
    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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  • 12
    Electronic Resource
    Electronic Resource
    Improvement of Unstructured Quadrilateral Mesh Quality for Multigrid Analysis (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 833-838 
    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: Due to more complex and severe design restrictions, more effective and faster finiteelement analyses are demanded. There are several ways to compute FE analysis efficiently: parallelcomputing, fast iterative or direct solvers, adaptive analysis and so on. One of the most effectiveanalysis ways is the combination of adaptive analysis and multigrid iterative solver, because anadaptive analysis requires several meshes with difference resolutions and multigrid solver utilizessuch meshes to accelerate its computation. However, convergence of multigrid solver is largelyaffected by initial shape of each element. An effective mesh improvement method is proposed here. Itis the combination of mesh coarsening and refinement. A good mesh can be obtained by the method tobe applied to an initial mesh, and better convergence is achieved by the improved initial mesh
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.833.pdf
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  • 13
    Electronic Resource
    Electronic Resource
    Mesh Generation of Revealable and Non-Revealable Multi-Shaped Sub-Domains (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 737-744 
    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 mathematical model for nonlinear multi-shaped randomly distributeddomains in revealable and non-revealbale fields is established by using waveform mesh generation(WMG) method with damp, and made the application function of finite element pre and posthandling system. The results show, this method can conduct mesh transformation to any givennonlinear function or given shapes in different scale randomly distributed domain in revealable andnon-revealable fields, and obtained some smoothly mesh with matching each boundary andneighboring domains interaction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.737.pdf
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  • 14
    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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  • 15
    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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  • 16
    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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  • 17
    Electronic Resource
    Electronic Resource
    Osteogenic Activity of MG63 Cells on Hydroxyapatite/Collagen Nanocompsosite under Pressure/perfusion Culture (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 317-320 
    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: The purpose of this study is to analyze osteogenic activity of human osteoblastic MG63cells on the bone-like self-organized hydroxyapatite/collagen (HAp/Col) nanocomposite spongecultured by a pressure/perfusion technique using collagen sponge as a control. Histologicalanalyses, alkaline phosphatase (AlkP) protein analysis and real-time polymerase chain reaction(PCR) analyses for AlkP and glyceraldehyde-3-phosphate dehydrogenase (GAPDH) to evaluate theosteogenic activity of MG63. The MG63 cells were attached well and showed good proliferation onthe HAp/Col sponge as well as in the control. The MG63 cells on HAp/Col sponge demonstratedhigher osteogenic activity than those on the control. The results suggested that the HAp/Col spongeis expected to be a good scaffold for bone tissue engineering
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.317.pdf
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  • 18
    Electronic Resource
    Electronic Resource
    Development of a Bioactive Inorganic/Organic Composite for Bone Formation Active Drug Carrier (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 330-332 (Feb. 2007), p. 1049-1052 
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.330-332.1049.pdf
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  • 19
    Electronic Resource
    Electronic Resource
    Bone Regeneration Materials (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 342-343 (July 2007), p. 277-280 
    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: Biomaterials Center is composed of five groups and collaborate each other to examineinterdisciplinary fields of biomaterials. In the ceramics-based biomaterials research, we have beendeveloping three novel bone regeneration materials, i.e., high-porosity hydroxyapatite (HAp)ceramics with high-strength, guided bone regeneration (GBR) membranes and bone-likenanocomposite composed of HAp and collagen. The GBR membrane composed of β-tricalciumphosphate and biodegradable copolymer of lactide, glycolide and ε-caprolactone has thermoplastic,pH auto-adjustment and enough mechanical property to protect an invasion of surrounding tissues.With the membrane, bone defect up to 20 × 10 × 10 mm3 in length in mandibles and segmentalbone defect up to 20 mm in length in tibiae of beagles are regenerated without any additional bonefillers or cell transplantations. The bone-like nanocomposite is synthesized by a co-precipitation ofHAp and collagen via their self-organization. The dense composite has a half to quarter mechanicalstrength (40 MPa) to cortical bone and the porous one demonstrates sponge-like viscoelasticity.The composites implanted into bone are incorporated into bone remodeling metabolism like asautogenous bone graft, i.e., they are resorbed by osteolasts followed by osteogenesis by osteoblasts
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.342-343.277.pdf
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  • 20
    Electronic Resource
    Electronic Resource
    Multi-Scale Strength Evaluations of SiC Particle Reinforced Aluminum Alloy by Using FEM Superposition Method (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 731-736 
    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 article presents a modified FEM Superpostion method (S-FEM) for compositematerial analysis. Around the reinforcement body, failure and interface fracture may occur in thematrix. So the S-FEM was employed to detect the stress distribution around the reinforcement. Oneparticle in big matrix is studied. Area of twice of particle radium is selected as local field.First, thefeasibility of modified S-FEM is verified. And by symmetric analysis, geometric distribution ofparticle which may influence on the strength of composite material were 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.33-37.731.pdf
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