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  • 1
    Electronic Resource
    Electronic Resource
    Phase Field Simulation of Rafting Behavior of γ`Phase in Nickel Base Superalloy (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 471-476 
    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 phase field simulations of the rafting behavior of γ’ phase with asimple interfacial dislocation network model. The interfacial dislocation network model accounts forthe effect of the network on the lattice misfit between γ and γ’ phases and the subsequent raftingbehavior. The model is implemented into the phase field simulation to see the dependence of therafting behavior of γ’ phases on the interfacial dislocation network. Without the dislocation networkmodel, the amount of the rafting was negligibly small. On the other hand, with the dislocationnetwork model, the γ’ phases shows a large amount of rafting, which is in good agreement with theresults of the experimental observations. Therefore, the combination of the phase field method andthe simple interfacial dislocation network model developed in this work is appropriate for thesimulation of the rafting of γ’ phases
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.471.pdf
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  • 2
    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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  • 3
    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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  • 4
    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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  • 5
    Electronic Resource
    Electronic Resource
    An Operative Case of Inferior Vena Cava Stenosis Due to Fibrosis Around Permanent Pacemaker Leads (2002)
    Oxford, UK : Blackwell Futura Publishing, Inc.
    Pacing and clinical electrophysiology 25 (2002), S. 0 
    Details
    ISSN: 1540-8159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: SHIMADA, Y., et al.: An Operative Case of Inferior Vena Cava Stenosis Due to Fibrosis Around Permanent Pacemaker Leads. A 56-year-old woman presented with general fatigue, dyspnea on exercise, and hepatomegaly subsequent to secondary implantation of a pacemaker. On admission, cardiac echo examination showed tricuspid valve regurgitation due to a migrated looped lead. At surgery, there was evidence of severe stenosis at both orifices of the superior and inferior vena cavae due to fibrous tissue around the leads. We removed the fibrous tissue, pacing leads, and generator. New leads were anchored onto the epicardium and a generator was inserted under the rectus muscle. The postoperative course was satisfactory and the symptoms disappeared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1460-9592.2002.00223.x
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  • 6
    Electronic Resource
    Electronic Resource
    Computer Simulation of Microstructure Evolution of Fe-Cu Alloy during Thermal Ageing (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 917-922 
    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: This paper describes a computer simulation of thermal ageing process in Fe-Cu alloy. In order to perform accurate numerical simulation, firstly, we make numerical models of the diffusion and dissociation of Cu and Cu-vacancy clusters. This modeling was performed with kinetic lattice Monte Carlo method, which allows us to perform long-time simulation of vacancy diffusion in Fe-Cu dilute alloy. The model is input to the kinetic Monte Carlo method, and then, we performed the kinetic Monte Carlo simulation of the thermal ageing in the Fe-Cu alloy. The results of the KMC simulations tell us that the our new models describes well the rate and kinetics of thediffusion and dissociation of Cu and Cu-vacancy clusters, and works well in the kinetic Monte Carlo simulations. Finally, we discussed the further application of these numerical models
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.917.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    Dislocation Dynamics Simulation of Grain Boundary Effects on Yield Behavior of Metals (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 741-746 
    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: This paper describes dislocation dynamics simulation of grain boundary effects on yield behavior of metals, such as α-Fe bcc metal. Since the stress field arising from the grain boundary has not been well understood yet, the geometrical effect of the grain boundary can be handled in the simulation by the use of rigid boundary condition. The dislocation pileups can be observed near the grain boundary in the result of the DD simulation. And the yield stress in the crystal having the grain boundary becomes larger than that in the crystal having free surface. This result tells us that the Hall-Petch effect can actually describe well the effects of the grain boundary on the yield behavior of metals
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.741.pdf
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  • 8
    Electronic Resource
    Electronic Resource
    Molecular Dynamics Simulation of Displacement Cascade in α-Zr (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 923-928 
    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: In this work, the point defect production in α-Zr at 600K by displacement cascadewith Primary Knock-on Atom (PKA) energy up to 20KeV has been investigated by molecular dynamics (MD) simulations. Especially, the influence of subcascades formation on the point defect and cluster production in 20keV cascades has been investigated in detail. The subcascade formation was seen in 36 cases of 20keV cascade simulations out of 50 cases. As the damaged areas are divided into many small areas, the maximum size of point defect cluster tends to decrease when the displacement cascade is settled. On the other hand, subcascades formation has not had an influence on the number of Frenkel pairs in final state of the 20keV cascades comparatively
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.923.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Numerical Analysis of Dimple Fracture Process under Different Constraint Conditions (2000)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 183-187 (Apr. 2000), p. 875-880 
    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/2011/0528/01/45/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.183-187.875.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Computer Simulation of Human Mandibular Bone Structure by iBone, a Novel Reaction-Diffusion Bone Remodeling Model (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 306-308 (Mar. 2006), p. 1277-1282 
    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: Bone is a complex system with adaptation and repair functions. To understand how bone cells can create a structure adapted to the mechanical environment, we proposed a simple bone remodeling model, iBone, based on a reaction-diffusion system [1]. A 3-dimensional mandibular bone model consisting of approximately 1.4 million elements was constructed from sequential computer tomography (CT) images of a 14-year old female. Both teeth and bone were modeled withisoparametric voxel elements with Young's Modulus = 20 GPa and Poisson's ratio = 0.3. Both heads of the mandible were fixed allowing rotation and horizontal movement. Teeth were fixed vertically allowing horizontal movements. Incisor, right/left group, and right/left molar biting conditions were simulated. The locations and directions of muscles, and their forces were predicted from the CTimages. Remodeling simulation was performed by 10 sets of finite element method analysis and reaction-diffusion remodeling simulation to obtain internal structure adapted to each loading condition. As a result, the major part of the corpus of the simulated mandibular bone showed similar internal structures under different biting conditions. Moreover, these simulated structures were satisfactorily similar to that of the real mandible. Computer simulation of three-dimensional bonestructures based on CT images will be very useful for understanding the patho-physiological state of bone under various mechanical conditions, and may assist orthopedic doctors to predict the risk and efficacy of surgical therapies
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/50/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.306-308.1277.pdf
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