Home / Journals / CMC / Vol.30, No.3, 2012
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  • Open Access

    ARTICLE

    Icosahedral-Decahedral Transformation in the (PdAg)309 Cluster Induced by Ag Atomic Segregation

    Guojian Li1, Qiang Wang1, Yongze Cao1, Kai Wang1, Jiaojiao Du1, Jicheng He1
    CMC-Computers, Materials & Continua, Vol.30, No.3, pp. 195-206, 2012, DOI:10.3970/cmc.2012.030.195
    Abstract This paper studies the influence of Ag atomic segregation on the structural evolutions of the mixed (PdAg)309 clusters during the heating processes by using molecular dynamics with a general embedded atom method. The results show that the Ag atomic segregation makes the cluster exhibit a segregate-melting stage in which the energy does not monotonic increase with the increase of temperature. In this stage, the cluster first transforms to form a disorder structure from the initial icosahedron and then a decahedron. By comparing with the cases in the pure Pd309, Ag309, and core-shell (PdAg)309, it is found that the icosahedral-decahedral transformation… More >

  • Open Access

    ARTICLE

    High Magnetic Field Annealing Dependent the Morphology and Microstructure of Nanocrystalline Co/Ni Bilayered Films

    Donggang Li1,2, Alexandra Levesque2, Qiang Wang1,3,2, Agnieszka Franczak2, Chun Wu1, Jean-Paul Chopart2, Jicheng He1
    CMC-Computers, Materials & Continua, Vol.30, No.3, pp. 207-218, 2012, DOI:10.3970/cmc.2012.030.207
    Abstract Co/Ni bilayered films were prepared on ITO glass by electrodeposition assisted with a magnetic field up to 0.5T aligned parallel to the electrode surface. The effect of a high magnetic field annealing up to 12T on morphology and microstructure of the post-deposited films was investigated by field emission scanning electronic microscopy (FE-SEM), X-ray diffraction (XRD) and atomic force microscopy (AFM). Grain shape and grain boundary in the Co/Ni morphology were modified dramatically when the high magnetic field was applied during the annealing process. Magnetic anisotropy appeared in the films due to the preferential orientation of fcc-CoNi alloy in comparison with… More >

  • Open Access

    ARTICLE

    An Enhanced Dipole Model Based Micro-Macro Description for Constitutive Behavior of MRFs

    Chunwei Zhao1,2, Xianghe Peng1,2,3, Jin Huang4, Ning Hu1,5,6
    CMC-Computers, Materials & Continua, Vol.30, No.3, pp. 219-236, 2012, DOI:10.3970/cmc.2012.030.219
    Abstract The validity of the two conventional micro-macro descriptions for MRFs, based respectively on the exact dipole model and the simplified dipole model, is examined with the results obtained with the commercially available finite element (FE) code ANSYS. It is found that although the simplified dipole model can match better the result by FE computation, there is still a marked difference. An enhanced dipole model is then suggested, which takes into account the contribution of the magnetized particles to magnetic field. Making use of a statistical approach and neglecting the interaction between particle chains, a micro-macro approach is developed for the… More >

  • Open Access

    ARTICLE

    Shape-Effect in the Effective Laws of Plain and Rubberized Concrete

    E. Ferretti
    CMC-Computers, Materials & Continua, Vol.30, No.3, pp. 237-284, 2012, DOI:10.3970/cmc.2012.030.237
    Abstract The procedure of the effective law outlined in this paper [Ferretti (2001); Ferretti and Di Leo (2003); Ferretti (2004b)] is an experimental procedure for identifying the constitutive law in uniaxial compression of brittle heterogeneous materials, and is based on the physical, analytical and numerical discussions about the existence or otherwise of strain-softening [Ferretti (2004a); Ferretti (2005)]. This procedure allows us to correct several incongruities that characterize the average stress versus average strain diagrams: it produces evidence against strain-softening in uniaxial compression [Ferretti (2004b)], whose existence may be questioned from a physical point of view [Ferretti (2004a); Ferretti (2005)], it provides… More >

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