Home / Journals / CMC / Vol.32, No.3, 2012
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  • Open Access

    EDITORIAL

    Preface

    Raimund Rolfes1, Eelco Jansen2, Börje Andersson3, Alexander Kling3
    CMC-Computers, Materials & Continua, Vol.32, No.3, 2012
    Abstract This article has no abstract. More >

  • Open Access

    ARTICLE

    A Loose Coupling Multiscale Approach for the Detailed Analysis of the Influence of Critical Areas on the Global Behaviour of Composite Structures

    D. Chrupalla1, J. Kreikemeier1, S. Berg2, L. Kärger3, M. Doreille4, T. Ludwig4, E. Jansen2, R. Rolfes2, A.Kling1
    CMC-Computers, Materials & Continua, Vol.32, No.3, pp. 159-176, 2012, DOI:10.3970/cmc.2012.032.159
    Abstract In this paper, a loose coupling multiscale modeling technique for the detailed numerical analysis of critical areas in composite structures is presented. It is used to describe the global (macroscopic) behaviour of composite structures taking into account the effects of local phenomena. This is done by indirectly connecting the global and local FE-models. Prescribed displacements are assigned to the local boundaries in the transition from the global to local modeling level. The local-to-global transition is realized by assigning averaged local stresses to the respective global Gauss points and by updating the global tangent stiffness operator. To illustrate the feasibility of… More >

  • Open Access

    ARTICLE

    Design Optimization of Composite Cylindrical Shells under Uncertainty

    B. Kriegesmann1, R. Rolfes1, E. L. Jansen1, I. Elishakoff2, C. Hühne3, A. Kling3
    CMC-Computers, Materials & Continua, Vol.32, No.3, pp. 177-200, 2012, DOI:10.3970/cmc.2012.032.177
    Abstract Four different approaches for the design of axially compressed cylindrical shells are presented, namely (1) the knockdown factor (KDF) concept, (2) the single perturbation load approach, (3) a probabilistic design procedure and (4) the convex anti-optimization approach. The different design approaches take the imperfection sensitivity and the scatter of input parameters into account differently. In this paper, the design of a composite cylinder is optimized considering the ply angles as design variables. The KDF concept provides a very conservative design load and in addition an imperfection sensitive design, whereas the other approaches lead to a significantly less conservative design load… More >

  • Open Access

    ARTICLE

    Generic Linking of Finite Element Models for Non-Linear Static and Global Dynamic Analyses of Aircraft Structures

    A.J. de Wit1, D. Akçay Perdahcıoğlu2, T. Ludwig3, W.M. van den Brink1, A. de Boer2
    CMC-Computers, Materials & Continua, Vol.32, No.3, pp. 201-218, 2012, DOI:10.3970/cmc.2012.032.201
    Abstract Depending on the type of analysis, Finite Element (FE) models of different fidelity are necessary. Creating these models manually is a labor intensive task. This paper discusses two approaches for generating FE models of different fidelity from a single reference FE model. The models are created with a single modelling and meshing toolkit. These different fidelity models are created for use with global-local non-linear static analysis and for use with dynamic linear sub-structuring reduction method. Efficiency of the developed approaches is demonstrated via non-linear static and modal analysis of a carbon-fiber stiffened panel. More >

  • Open Access

    ARTICLE

    An Enhanced Formulation of the Maximum Entropy Method for Structural Optimization

    S. Hernández1,2, A. Baldomir1, J. Díaz1, F. Pereira1
    CMC-Computers, Materials & Continua, Vol.32, No.3, pp. 219-240, 2012, DOI:10.3970/cmc.2012.032.219
    Abstract A numerical optimization method was proposed time ago by Templeman based on the maximum entropy principle. That approach combined the Kuhn-Tucker condition and the information theory postulates to create a probabilistic formulation of the optimality criteria techniques. Such approach has been enhanced in this research organizing the mathematical process in a single optimization loop and linearizing the constraints. It turns out that such procedure transforms the optimization process in a sequence of systems of linear equations which is a very efficient way of obtaining the optimum solution of the problem. Some examples of structural optimization, namely, a planar truss, a… More >

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