Biel/Bienne, Switzerland
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Ludwig T.,SMR Engineering and Development | Doreille M.,SMR Engineering and Development | Merazzi S.,SMR Engineering and Development | Vescovini R.,Polytechnic of Milan | Bisagni C.,Polytechnic of Milan
Progress in Aerospace Sciences | Year: 2015

This paper presents a methodology for predicting the damped response and energy dissipation of laminated composite structures, subjected to dynamic loads. Starting from simple coupon tests to characterize the material, the numerical simulation of damping properties is made possible by a novel linear viscoelastic model that has been developed and implemented in the finite element code B2000++. A nonlinear optimization procedure is adopted to fit experimental data and define the exponential Maxwell parameter model. To illustrate the potentialities of the method, the post-buckling analysis of a relatively complex aeronautical panel is presented, accounting not only for geometric nonlinearities, but also for viscoelastic effects. The results illustrate the effects due to material dissipation, their relation to the effects of inertia, and the influence of geometric imperfections on the response of the panel. © 2015 Elsevier Ltd.

De Wit A.J.,National Aerospace Laboratory Netherlands | Perdahcioglu D.A.,University of Twente | Ludwig T.,SMR Engineering and Development | Van Den Brink W.M.,National Aerospace Laboratory Netherlands | De Boer A.,University of Twente
Computers, Materials and Continua | Year: 2012

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 substructuring reduction method. Efficiency of the developed approaches is demonstrated via non-linear static and modal analysis of a carbon-fiber stiffened panel. © 2012 Tech Science Press.

Akcay Perdahcidotlessoglu D.,University of Twente | Doreille M.,SMR Engineering and Development | de Boer A.,University of Twente | Ludwig T.,SMR Engineering and Development
International Journal for Numerical Methods in Engineering | Year: 2013

A common mesh refinement-based coupling technique is embedded into a component mode synthesis method, Craig-Bampton. More specifically, a common mesh is generated between the non-conforming interfaces of the coupled structures, and the compatibility constraints are enforced on that mesh via L2-minimization. This new integrated method is suitable for structural dynamic analysis problems where the substructures may have non-conforming curvilinear and/or surface interface meshes. That is, coupled substructures may have different element types such as shell, solid, and/or beam elements. The proposed method is implemented into a commercial finite element software, B2000++, and its demonstration is carried out using an academic and industry oriented test problems. © 2013 John Wiley & Sons, Ltd.

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