CMC-Vol. 32, No. 3, 2012

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 >

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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. More >

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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 More >

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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 >

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An Enhanced Formulation of the Maximum Entropy Method for Structural Optimization
S. Hernández^1,2, 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, More >

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