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  • Open AccessOpen Access

    ARTICLE

    Review of "The Theory of Materials Failure" by Prof. Richard M. Christensen, Stanford University Published by: Oxford University Press, 2013, 277 pages

    Satya N. Atluri1
    CMC-Computers, Materials & Continua, Vol.39, No.1, pp. 1-2, 2014, DOI:10.3970/cmc.2014.039.001
    Abstract This article has no abstract. More >

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    1542

  • Open AccessOpen Access

    ARTICLE

    Dynamic Instability of Rectangular Composite Plates under Parametric Excitation

    Meng-Kao Yeh1, Chia-Shien Liu2, Chien-Chang Chen3
    CMC-Computers, Materials & Continua, Vol.39, No.1, pp. 3-20, 2014, DOI:10.3970/cmc.2014.039.003
    Abstract The dynamic instability of rectangular graphite/epoxy composite plates under parametric excitation was investigated analytically and experimentally. In analysis, the dynamic system of the composite plate, obtained based on the assumedmodes method, is a general form of Mathieu’s equation, including parametrically excited terms. The instability regions of the system, each separated by two transition curves, were found to be functions of the modal parameters of the composite plate and the position and the excited amplitude of the electromagnetic device on the composite plates. The fiber orientation, the aspect ratio and the layer numbers of the composite plates were varied to assess… More >

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    1113

  • Open AccessOpen Access

    ARTICLE

    Change of Scale Strategy for the Microstructural Modelling of Polymeric Rohacell Foams

    J. Aubry1, P. Navarro1, S. Marguet1, J.-F. Ferrero1, O. Dorival2, L. Sohier3, J.-Y. Cognard3
    CMC-Computers, Materials & Continua, Vol.39, No.1, pp. 21-47, 2014, DOI:10.3970/cmc.2014.039.021
    Abstract In this paper a numerical model dedicated to the simulation of the mechanical behaviour of polymeric Rohacell foams is presented. The finite elements model is developed at the scale of the microstructure idealized by a representative unit cell: the truncated octahedron. Observations made on micrographs of Rohacell lead to mesh this representative unit cell as a lattice of beam elements. Each beam is assigned a brittle linear elastic mechanical behaviour in tension and an elastoplastic behaviour in compression. The plasticity in compression is introduced as a way to mimic the buckling of the edges of the cells observed in experimental… More >

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    1586

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    1499

  • Open AccessOpen Access

    ARTICLE

    A Novel Approach to Identify the Thermal Conductivities of a Thin Anisotropic Medium by the Boundary Element Method

    Y.C. Shiah1, Y.M. Lee2, T.C. Huang2
    CMC-Computers, Materials & Continua, Vol.39, No.1, pp. 49-71, 2014, DOI:10.3970/cmc.2014.039.049
    Abstract A common difficulty arises in characterizing the anisotropic properties of a thin sheet of anisotropic material, especially in the transverse direction. This difficulty is even more phenomenal for measuring its mechanical properties on account of its thickness. As the prelude of such investigation, this paper proposes a novel approach to identify the thermal conductivities of an unknown thin layer of anisotropic material. For this purpose, the unknown layer is sandwiched in isotropic materials with known conductivities. Prescribing proper boundary conditions, one may easily measure temperature data on a few sample boundary points. Therefore, the anisotropic thermal conductivities can be calculated… More >

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    1092

  • Open AccessOpen Access

    ARTICLE

    Electronic Structure and Magnetic Properties of New Rare-earth Half-metallic Materials AcFe2O4 and ThFe2O4: Ab Initio Investigation

    Jingguo Yan1, Xudong Wang1, Man Yao1,2, Ning Hu3,4
    CMC-Computers, Materials & Continua, Vol.39, No.1, pp. 73-84, 2014, DOI:10.3970/cmc.2014.039.073
    Abstract Electronic structure and magnetism of the rare-earth metals Ac and Th doped Fe3O4 Fe1-xRexFe2-yReyO4(Re=Ac, Th; x=0, 0.5, 1; y=0, 0.5, 1.0, 1.5, 2.0) are investigated by first-principle calculations. AcFe2O4, FeAc2O4 and ThFe2O4 are found to be II B-type half-metals. The large bonding-antibonding splitting is believed to be the origin of the gap for AcFe2O4, FeAc2O4 and ThFe2O4, resulting in a net magnetic moment of 9.0μB, 4.0μB and 8.1μB, respectively, compared with 4.0μB of Fe3O4. Also, the conductance of AcFe2O4 and ThFe2O4 are both slightly larger than that of Fe3O4. It can be predicted that the new rare-earth half-metals AcFe2O4 and… More >

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