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  • 1
    Electronic Resource
    Electronic Resource
    Behaviour of Cellular Structures under Impact Loading a Computational Study (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 566 (Nov. 2007), p. 53-60 
    Details
    ISSN: 1662-9752
    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: New multiphysical computational models for simulation of regular open and closed-cellcellular structures behaviour under compressive impact loading are presented. The behaviour ofcellular structures with fluid fillers under uniaxial impact loading and large deformations has beenanalyzed with the explicit nonlinear finite element code LS-DYNA. The behaviour of closed-cellcellular structure has been evaluated with the use of the representative volume element, where theinfluence of residual gas inside the closed pores has been studied. Open-cell cellular structure wasmodelled as a whole to properly account for considered fluid flow through the cells, whichsignificantly influences macroscopic behaviour of cellular structure. The fluid has been modelled byapplying a Smoothed Particle Hydrodynamics (SPH) method. Computational simulations showedthat the base material has the highest influence on the behaviour of cellular structures under impactconditions. The increase of the relative density and strain rate results in increase of the cellularstructure stiffness. Parametrical numerical simulations have also confirmed that filler influences themacroscopic behaviour of the cellular structures which depends on the loading type and the size ofthe cellular structure. In open-cell cellular structures with higher filler viscosity and higher relativedensity, increased impact energy absorption has been observed
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/18/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.566.53.pdf
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  • 2
    Electronic Resource
    Electronic Resource
    Thermal Post-Impact Behavior of Closed-Cell Cellular Structures with Fillers – Part I (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 553 (Aug. 2007), p. 196-201 
    Details
    ISSN: 1662-9752
    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 study describes the behavior of regular closed-cell cellular structure with gaseousfillers under impact conditions and consequent post-impact thermal conduction due to thecompression of filler gas. Two dependent but different analyses types have been carried out for thispurpose: (i) a strongly coupled fluid-structure interaction and (ii) a weakly coupled thermalstructuralanalysis. This paper describes the structural analyses of the closed-cell cellular structureunder impact loading. The explicit code LS-DYNA was used to computationally determine thebehavior of cellular structure under compressive dynamic loading, where one unit volume elementof the cellular structure has been discretised with finite elements considering a simultaneousstrongly coupled interaction with the gaseous pore filler. Closed-cell cellular structures withdifferent relative densities and initial pore pressures have been considered. Computationalsimulations have shown that the gaseous filler influences the mechanical behavior of cellularstructure regarding the loading type, relative density and type of the base material. It was determinedthat the filler’s temperature significantly increases due to the compressive impact loading, whichmight influence the macroscopic behavior of the cellular structure
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.553.196.pdf
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  • 3
    Electronic Resource
    Electronic Resource
    Evaluation of Thermal and Mechanical Filler Gas Influence on Honeycomb Structures Behavior (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 553 (Aug. 2007), p. 190-195 
    Details
    ISSN: 1662-9752
    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 behavior of hexagonal honeycombs under dynamic in-plane loading isdescribed. Additionally, the presence and influence of the filler gas inside the honeycomb cells isconsidered. Such structures are subjected to very large deformation during an impact, where thefiller gas might strongly affect their behavior and the capability of deformational energy absorption,especially at very low relative densities. The purpose of this research was therefore to evaluate theinfluence of filler gas on the macroscopic cellular structure behavior under dynamic uniaxialloading conditions by means of computational simulations. The LS-DYNA code has been used forthis purpose, where a fully coupled interaction between the honeycomb structure and the filler gaswas simulated. Different relative densities, initial pore pressures and strain rates have beenconsidered. The computational results clearly show the influence of the filler gas on themacroscopic behavior of analyzed honeycomb structures. Because of very large deformation of thecellular structure, the gas inside the cells is also enormously compressed which results in very highgas temperatures and contributes to increased crash energy absorption capability. The evaluatedresults are valuable for further research considering also the heat transfer in honeycomb structuresand for investigations of variation of the base material mechanical properties due to increased gastemperatures under impact loading conditions
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.553.190.pdf
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  • 4
    Electronic Resource
    Electronic Resource
    Thermal Post-Impact Behavior of Closed-Cell Cellular Structures with Fillers – Part II (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 553 (Aug. 2007), p. 202-207 
    Details
    ISSN: 1662-9752
    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 paper describes the post-impact thermal conduction of regular closed-cell cellularstructure with gaseous fillers due to the dynamic compression. Two different but subsequentcomputational analyses have been carried out for this purpose. To define the behavior of the cellularstructure under compressive dynamic loading, a unit volume element of the cellular structure hasbeen analyzed with the explicit finite element code LS-DYNA by considering a strongly coupledinteraction of the cellular structure base material with the gaseous pore filler. The resultingdeformed cellular structure has then been imported in the finite volume code ANSYS CFX 10.0 forfurther weakly coupled thermal-structural analyses of post-impact heat conduction through the basematerial and filler gas. The increased temperature and pressure of the filler gas after compressiveimpact loading from the initial analyses have been used as initial conditions for the thermalanalyses, where only the heat conduction due to the gas compression has been taken into account.This paper considers only the closed-cell cellular structure with two different relative densities andair inside the pores. Computational simulations have shown a low overall temperature increase ofthe cellular structure due to filler gas compression. The temperature increase of the base material isexpected to be higher at lower relative densities. The presented procedure illustrates a convenientapproach to solving strongly coupled fluid-structure interaction problems by considering also aweakly coupled thermal-structural solution, which can be used for a wide range of engineeringapplications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.553.202.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    SIMULATION OF PROGRESSIVE FRACTURING UNDER DYNAMIC LOADING CONDITIONS (1997)
    Chichester : Wiley-Blackwell
    Communications in Numerical Methods in Engineering 13 (1997), S. 127-138 
    Details
    ISSN: 1069-8299
    Keywords: transient dynamic analysis ; strain softening ; localization of deformation ; material rate-dependency ; viscoplasticity ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: Progressive fracturing in transient dynamic problems is considered, where it is assumed that microcracking is initiated upon the violation of a failure criterion and is further governed by the strain softening process. Strain-rate dependency of materials subjected to an impulsive loading is accounted for by the addition of viscous effects in a continuum description. The Perzyna viscoplastic material law is modified to ensure the well-posedness of the initial value problem at all times and to achieve a gradual reduction of the rate-dependent material strength after the rate-independent load carrying capacity vanishes. The occurrence of strain softening in the continuum leads to localization of deformation, and further propagation of these localized zones of intense deformation results in the development of fully opened cracks and ultimately in a structural discontinuity. A finite element removal technique is considered for modelling the final separation of the continuum. Two representative numerical examples are given. © 1997 John Wiley & Sons, Ltd.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Simulation of surface pitting due to contact loading (1998)
    Chichester [u.a.] : Wiley-Blackwell
    International Journal for Numerical Methods in Engineering 43 (1998), S. 33-50 
    Details
    ISSN: 0029-5981
    Keywords: contact problems ; material fatigue ; pitting ; fracture mechanics ; finite element method ; experiments ; Engineering ; Numerical Methods and Modeling
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mathematics , Technology
    Notes: A computational model for simulation of surface pitting of mechanical elements subjected to rolling and sliding contact conditions is presented. The two-dimensional computational model is restricted to modelling of high-precision mechanical components with fine surface finishing and good lubrication, where the cracks leading to pitting are initiated in the area of largest contact stresses at certain depth under the contacting surface. Hertz contact conditions with addition of friction forces are assumed and the position and magnitude of the maximum equivalent stress is determined by the finite element method. When the maximum equivalent stress exceeds the local material strength, it is assumed that the initial crack develops along the slip line in a single-crystal grain. The Virtual Crack Extension method in the framework of finite element analysis is then used for two-dimensional simulation of the fatigue crack propagation under contact loading from the initial crack up to the formation of the surface pit. The pit shapes and relationships between the stress intensity factor and crack length are determined for various combinations of contacting surface curvatures and loadings. The model is applied to simulation of surface pitting of two meshing gear teeth. Numerically predicted pit shapes in the face of gear teeth show a good agreement with the experimental observations. © 1998 John Wiley & Sons, Ltd.
    Additional Material: 17 Ill.
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  • 7
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    Influence of the explosive treatment on the mechanical properties and microstructure of copper (2015)
    Elsevier
    Details
    Publication Date: 2015-06-01
    Print ISSN: 0261-3069
    Electronic ISSN: 1873-4197
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 8
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    Structural characterisation of advanced pore morphology (APM) foam elements (2013)
    Elsevier
    Details
    Publication Date: 2013-11-01
    Print ISSN: 0167-577X
    Electronic ISSN: 1873-4979
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 9
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    Uni-directional porous metal fabricated by rolling of copper sheet and explosive compaction (2016)
    Elsevier
    Details
    Publication Date: 2016-05-01
    Print ISSN: 0167-577X
    Electronic ISSN: 1873-4979
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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  • 10
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    Mechanical and microstructural analysis of unidirectional porous (UniPore) copper (2016)
    Elsevier
    Details
    Publication Date: 2016-01-01
    Print ISSN: 0264-1275
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Published by Elsevier
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