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  • 2005-2009  (39)
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Material
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Year
  • 1
    Electronic Resource
    Electronic Resource
    Numerical Simulation of Ductile Fracture Process Including Shear-Lip Fracture (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 345-346 (Aug. 2007), p. 839-844 
    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: Thickness effect is studied experimentally. At free surface of the specimen, shear lipfracture pattern appears, though dimple fracture pattern is observed inside of the specimen. The areaof shear-lip fracture changes due to the change of the specimen thickness. In this study, experimentalstudy is conducted by changing specimen thicknesses. Fracture surfaces are precisely observed usingSEM, and dimple patterns on them are observed. At the free surface, very narrow no-void area isobserved. It is also found that many voids are nucleated in shear-lip fracture area. FEM simulation iscarried out using Gurson’s constitutive equation. It is found that shear-lip type fracture is simulatednear free surface area by this method. The results show similar tendency with the experimentalobservation
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.839.pdf
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Development of In Situ-Formed Interconnected Porous Scaffolds with Low Porosity (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 415-418 
    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: Biocompatible and water-soluble fibers (sodium carboxymethyl cellulose (CMC)) werefabricated via a wet-spinning method. The CMC fibers/ polymethyl methacrylate (PMMA)mixtures and CMC fibers/Poly (L-lactide-co-glycolide-co- -caprolactone) (PLGC) mixtures wereprepared by a heat-kneading method. For CMC fibers/PMMA, after removal of the CMC fibersfrom the mixtures, the interconnected porous scaffolds with porosity from 27.79 % to 60.98 %(volume percent) were obtained. For CMC fibers/PLGC, the interconnected porous scaffolds withporosity 38.55 % and 76.83 % (volume percent) were prepared. The solid CMC fibers/PLGCmixtures had the higher ultimate tensile strength and Young, s modulus than those of porousPLGC scaffolds
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.415.pdf
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Changes in Osteogenic Activity of MG63 Cells on Hydroxyapatite/Collagen Nanocomposite Sponge under Pressure/Perfusion Culture (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 361-363 (Nov. 2007), p. 1079-1082 
    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 bone-like self-organized hydroxyapatite/collagen (HAp/Col) nanocomposite spongewas prepared from HAp/Col nanocomposite fibers. We analyzed osteogenic activity of humanosteoblastic MG63 cells in the HAp/Col sponge under pressure/perfusion culture. Collagen (Col)sponge was used as a control. The MG63 cells were attached well and showed good proliferation inthe HAp/Col sponge. The total DNA content in the HAp/Col sponge was approximately 1.8 timesgreater than that in the Col sponge at 21 days. The MG63 cells showed good osteogenic geneexpression in the HAp/Col sponge by reverse transcription-polymerase chain reaction analysis.These result suggested that HAp/Col sponge can be useful for bone tissue engineering scaffoldmaterials
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.361-363.1079.pdf
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Study on the Stress Intensity Factor for Mixed Mode Surface Crack under Three Point Bending (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 85-90 
    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 the virtual crack closure method (VCCM), the energy release rate is computed based onthe results of finite element calculation, and the stress intensity factor (SIF) is computed from theenergy release rate. In this paper, the stress intensity factor of mixed-mode surface cracks under threepoint bending is studied by using the three dimensional modified virtual crack closure method(MVCCM). The modified virtual crack closure method is required to open one element face areawhose shape is arbitrary and finite element widths are unequal across the crack front. The effect of thedistance between the location of load and crack face, crack shape and crack depth to the stressintensity factor is also discussed, along with practical results and conclusions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.85.pdf
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Fatigue Crack Growth Simulation Using S-Version FEM (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 133-138 
    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: Fatigue crack growth under mixed mode loading conditions is simulated using S-FEM. Byusing S-FEM technique, only local mesh should be re-meshed and it becomes easy to simulate crackgrowth. By combining with auto-meshing technique, local mesh is re-meshed automatically, andcurved crack path is modeled easily. Plural fatigue crack problem is solved by this technique. Fortwo parallel crack problem, criteria of crack coalescence are proposed. By simulating this problem byS-FEM, it is verified these criteria are conservative ones
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.133.pdf
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    Paper (German National Licenses)
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  • 6
    Electronic Resource
    Electronic Resource
    Research on Mode I and Mode II Dynamic Fracture in High Strength Steels under High Loading Rates (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 33-37 (Mar. 2008), p. 351-356 
    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: The Mode I and Mode II dynamic fracture toughness (DFT) values, KId and KIId for highstrength steels 40Cr and 30CrMnSiNi2A were evaluated using a combined experimental-numericalmethod. The tests were performed on three point bend (3PB) and shear specimens with Hopkinsonpressure bar. The time of crack initiation was determined by a strain gauge. With the assistance of3-D transient finite element analysis, the temporal evolution of the dynamic stress intensity factorunder different loading rates was obtained, and the DFT was determined by the fracture initiationtime. In Mode I tests, a brittle transgranular fracture was found in 40Cr, while evidence for ductilefracture was observed on the failure surface of 30CrMnSiNi2A. In Mode II tests, both tensile cracksand adiabatic shear bands were found for the two steels. The effect of ligament size on fracturetoughness was discussed. The correlations of KId and KIId with loading rate were also investigated.The micromechanisms of loading rate effect on the DFT were discussed for both modes
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.33-37.351.pdf
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    Paper (German National Licenses)
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  • 7
    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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  • 8
    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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  • 9
    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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  • 10
    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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