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Développement de méthodes de réduction d'échelle pour l'étude de structures composites sollicitées en dynamique rapide.

Abstract : The presence of unavoidable distortions makes that the standard methods of scale reduction
are not usable for the prediction of the non-linear behaviour of structures in laminated
composite. First, a new method able to cope with the scale effects is developed from the
example of energy absorbers in glass E / epoxy loaded in static axial compression. In a second
instance, a frequential study is carried out in order to extend this method to the loading in
rapid dynamic. Some comparisons with the results from the Cauchy's similarity law highlight
a significant improvement in term of the accuracy of the predictions of the plateaus of force.
Lastly, a model by finite elements is carried out in order to study the various phenomena
which occur during crashtests and to investigate the use of the indirect similarity method. This
numerical model also makes it possible to specify the causes of the scale effect previously
detected.
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Contributor : Rémi Grenêche <>
Submitted on : Wednesday, October 18, 2006 - 9:47:45 PM
Last modification on : Friday, November 13, 2020 - 8:44:11 AM
Long-term archiving on: : Tuesday, April 6, 2010 - 8:08:09 PM

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Rémi Grenêche. Développement de méthodes de réduction d'échelle pour l'étude de structures composites sollicitées en dynamique rapide.. Mécanique [physics.med-ph]. Université de Valenciennes et du Hainaut-Cambresis, 2006. Français. ⟨tel-00107498⟩

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