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  • 1
    Electronic Resource
    Electronic Resource
    Molecular Dynamics Simulation for Compressive Mechanics Properties of SWCNT with Random Distributed Vacancies (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1161-1164 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Configurations of single-walled carbon nanotubes (SWCNTs) with randomly distributedvacancies were generated by numerical method. Molecular dynamics (MD) method was used toinvestigate the compressive mechanics properties of SWCNTs with vacancies. The simulation resultsshow that the SWCNTs with vacancies have more complicated deformation procedures and theYoung’s modulus is lower than the corresponding perfect SWCNTs. The Young’s modulus of theSWCNTs with no more than 20 vacancies ranges from 940Gpa to 620Gpa, and its value isapproximately linearly proportional to the number of vacancies. It is found that local buckling firstappears in the surface region having high density of vacancies of (10, 10) SWCNTs under axialcompression. As the loading increases, SWCNTs with more vacancies have more complicatedbuckling configuration and sluggish energy variation. Under a case of the same displacement load themore vacancies the SWCNT has, the more complicated the mechanical behavior is. SWCNTs with 20vacancies can still maintain self structure stabilization, this validates that SWCNTs have good spacialstabilization
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1161.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Atomistic Study of the Strain- and Size-Dependence of Poisson’s Ratio of Single-Walled Carbon Nanotubes (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1021-1024 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Three armchair single-walled carbon nanotubes (SWCNTs) (7, 7), (12, 12), (17, 17) andthree zigzag SWCNTs (12, 0), (16, 0), (20, 0) are investigated in this paper, using the moleculardynamic (MD) method with the second-generation Tersoff-Brenner (TB) potential. The Poisson’sratio of these nanotubes under tensile and compressive loading is obtained. The effect of the strainand size on the Poisson’s ratio of nanotubes is analyzed systematically, from the viewpoints of thestructure and the averaged atomic potential energy of nanotubes. The results show that the Poisson’sratio of nanotubes decreases as the strain increases. The Poisson’s ratios of nanotubes of larger chiralangle decrease more quickly. For nanotubes of the same chiral angle, the larger the diameters ofnanotubes are, the larger their Poisson’s ratios become. Moreover, the Poisson’s ratios of nanotubesof larger diameter are more approaching
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1021.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Molecular Dynamics Simulation and Analysis on the Stress Induced Crystallization Behavior of Metallic Glass Cu (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1011-1016 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: The compressive deformation of metallic glass Cu was studied under uniformly distributedstrains with different rates at 1 K temperature using molecular dynamics simulations. The interactionbetween atoms in the system adopts the embedded atom method (EAM) reported by Mishin. Wefound that MG Cu is an elastic/perfect plastic material and the Young modulus is about 50 Gpa withstrain rates from 0.1ns-1 to 10 ns-1. At low strain rates the sample deforms inhomogeneously and theamorphous phase transforms continuously to a crystalline phase. It was observed that the nucleation,growth and mergence processes of crystalline are induced by stress. At high strain rates the systempasses through plastic deformations homogeneously and keeps the amorphous structure. The higherflow stress occurs at higher strain with the strain rate increasing. The stress effect is an importantfactor that induces MG crystallization just like temperature effect. The relationship betweencharacteristic nucleation rate and strain rate determines the different deformation mechanism of MG
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1011.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Strength and Fracture of Single Crystal Metal Nanowire (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 33-38 
    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: Numerical simulations have been carried out to determine the mechanical property of single crystal copper nanowire subjected to tension using the molecular dynamics method. The mechanism of deformation, strength and fracture are elucidated based on these numerical simulations. No strengthening is found after yielding of the single crystal nanowire. The simulation results show that the strength of copper nanowire is far greater than that of realistic polycrystalline bulk copper. By decreasing the size of the nanowire's cross-section, which leads to an increase of the ratio of surface atoms, the yield stress is increased. The strain rate has an influence on strength, and mechanism of deformation and fracture. When the strain rate is comparatively low, plastic deformation arises from dislocation slips and twins. However, when the strain rate is sufficiently high, amorphization is a dominant factor of plastic deformation and super-plasticity is found. The fracture process isdemonstrated using the atomic images
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/47/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.261-263.33.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Atomistic Computer Simulation of Fracture Process at Nanoscale (2004)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 274-276 (Oct. 2004), p. 349-354 
    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/2011/0528/01/48/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.274-276.349.pdf
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  • 6
    Electronic Resource
    Electronic Resource
    A Three-Dimensional Finite Element Model of Hydraulic Progressive Damage (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 375-378 
    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: Three-dimensional finite element simulations were carried out to investigate the hydraulicprogressive damage and associated flow behavior in rock. In this study cohesive elements were usedto simulate the damage of rock. A three-dimensional coupled pore fluid flow and stress model wasproposed. The commercial engineering software ABAQUS is employed to simulate the damageprocess in rock along several predefined paths. A user-subroutine named FLOW was developed toenhance the capability of ABAQUS to deal the moving loadings. With the proposed coupling model,we studied the stress distribution, the pore pressure, the fluid loss, the geometry of the progressivedamage. The results show that the length and the width of the path of the progressive damage arestrongly influenced by both the hydraulic pressure and the injection time. The results provide goodinterpretation and understanding of the mechanism of hydraulic progressive damage in rock. Thisstudy is very useful and important to the oil engineering and some other rock engineering fields
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.375.pdf
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  • 7
    Electronic Resource
    Electronic Resource
    A boundary integral equation formulation for the Reissner's plates resting on two-parameter foundation (1992)
    Springer
    Acta mechanica solida Sinica 5 (1992), S. 85-98 
    Details
    ISSN: 0894-9166
    Keywords: two-parameter foundation ; Reissner's plates ; fundamental solutions ; BEM
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper a boundary integral equation formulation for the Reissner's plates resting on a two-parameter foundation is established. With the aid of the Hormander Operator method, the equations of the corresponding fundamental solutions are converted into a sixth order partial differential equation with a scale function as an unknown. In order to reduce the equation further, two auxiliary functions are introduced. They satisfy a second and a fourth order equation respectively. The expressions of the auxiliary functions can be derived easily. The fundamental solutions of the Reissnei's plates on the two-parameter foundation arc expressed by a linear combination of the auxiliary functions and their derivatives. The boundary integral equations are formulated by the use of the weighted residual procedure. The fundamental solutions obtained are taken as the kernel functions of the boundary integral equations. A few examples are studied. The numerical results show high accuacy and efficiency of the present formulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02215630
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  • 8
    Electronic Resource
    Electronic Resource
    A comparative study on algorithms of boundary element solution for free torsional vibration of bodies of revolution (1990)
    Springer
    Acta mechanica solida Sinica 3 (1990), S. 315-326 
    Details
    ISSN: 0894-9166
    Keywords: mixed BEM / FEM formulation ; fundamental solution ; free vibration ; bodies of revolution
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract In this paper the functionu=Ψrsinθ in cylindrical coordinates (r,θ,z) is introduced into the equation for free torsional vibration of bodies of revolution (whereΨ=v / r represents the angle of twist). With the static fundamental solution (−1 /R) a mixed BEM / FEM equation is derived. The domain integral term in the equation is discretized by Serendipity elements instead of commonly used constant value finite elements in the literature. The equation is an algebraic eigenvalue one. The dynamic fundamental solution (e 1λR /R) is also used for deriving the other mixed BEM / FEM equation. An appropriate iterative solution procedure is described. An algebraic eigenvalue equation can be obtained and its solution accuracy is almost interior meshing independent. A number of examples are studied. The results show the good economy and high accuracy of the algorithms proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02206401
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  • 9
    Electronic Resource
    Electronic Resource
    Modeling and Simulation of Hydraulic Fracturing Propagation in Permeable Reservoirs (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 324-325 (Nov. 2006), p. 383-386 
    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: Numerical simulation of hydraulic fracturing propagations in the permeable reservoirs wascarried out with the finite element analysis software (ABAQUS). A model of coupling the stressequilibrium and fluid continuity equations was proposed and implemented. The nonuniform of sinkpore pressure on the fracture surfaces which changes associated with the propagation of fracture wasdescribed by a self-developed subroutine through the FLOW in ABAQUS. Samples under differentconditions were conducted for studying the rules of the propagation of hydraulic fracturing. Theresults show that the permeability at the fracture tip is more serious than any other places of thefracture face. The model also illustrates that the fracture geometry is mainly determined by theminimal in-situ stress. The model can be used to simulate the effects of hydraulic fracturing pressuresand injection rates on fracture propagation. The results are of much significance for the design ofhydraulic fracturing treatments
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/52/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.324-325.383.pdf
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  • 10
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    Atomic Simulation of Structure and Deformation's Influence on the Mechanical Properties of Single-walled Carbon Nanotubes (2006)
    American Institute of Physics
    Details
    Publication Date: 2006-08-01
    Print ISSN: 1674-0068
    Electronic ISSN: 2327-2244
    Topics: Chemistry and Pharmacology , Physics
    Published by American Institute of Physics on behalf of Chinese Physical Society.
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