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  • 1
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 353-358 (Sept. 2007), p. 651-654 
    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 stochastic nature of aluminum foam structure, having a random distribution of voids,makes it difficult to model its compressive deformation behavior accurately. In this paper, a2-dimensional simplified modeling approach is introduced to analyze the compressive deformationbehavior that occurs in Alporas aluminum foam (Al foam). This has been achieved using imageanalysis on real undeformed aluminum foam images obtained by VHX-100 digital microscope. Finiteelement mesh for the cross sectional model is generated with Object Oriented Finite element (OOF)method combined with ABAQUS structural analysis. It is expected that OOF modeling enableprediction of the origin of failure in terms of localized deformation with respect to the microstructuraldetails. Furthermore, strain concentration sites leading to the evolution of the deformation band canbe visualized. Thus, this investigation addresses the local inhomogeneity in the Al foam structure.This study implies that the OOF modeling approach combined with experimental observations canprovide better insight into the understanding of aluminum foam compressive deformation behavior
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 261-263 (Apr. 2004), p. 337-344 
    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 Indonesian railway transportation has adventages in term of capacity, efficiency, trafic, and safety compared to the other types of land transportations. At present, the Indonesian Railway Company has 519 locomotives, and 1643 passenger cars, that transport about 184 million man-trip each year[1,2]. Unfortunately, the rate of train collisions in Indonesian railway system was veryhigh. In the last ten years, 2352 train accidents have happened which claimed 997 lives and left 2638 people injured. The record shows that 110 of those accidents were train to train collisions[1]. This paper consider the structural impact behavior of Indonesian passenger railway car subject to collision forces. This characteristic is very important parameter for passenger protection during the course of collision[3-5]. The vehicle structure should be able to absorb the huge impact energy or impact force to ensure the passenger safety[6-9]. The impact energy of cars-train is evaluated using the principle of multibody dynamics[10,11]. The vehicle structure under impact load is analyzed using the finite element method. The principal of symmetry is adopted, so the collision scene could be simulated as collision between the vehicle with a rigid wall. The analysis result shows that the structure is collapse at the passenger area (saloon) which is in agreement with the real collision.Modification is proposed to protect the passenger area by introducing crush zone area and impact energy absorber
    Type of Medium: Electronic Resource
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