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Homogénéisation de plaques périodiques épaisses : application aux panneaux sandwichs à âme pliables en chevrons

Abstract : Sandwich panels are widespread in everyday life. Their structural efficiency is well-known and is a central criterion in possible applications. This Ph.D. thesis is dedicated to the study of a new sandwich panel core which might replace honeycomb in some applications: the chevron pattern. In order to compare this new core to other ones, an accurate knowledge of its mechanical behavior is necessary. However, the price for structural efficiency is a more complex mechanical behavior. This is the case for the shear forces stiffness which is critical when comparing sandwich panels cores. Thus, in this work we reconsider in details and in the general case how to derive plates behavior under shear forces. A new plate theory is suggested as well as the related homogenization scheme for periodic plates. This plate theory is the extension of the well-known Reissner-Mindlin plate theory in the case of heterogeneous plates. However, it cannot be reduced to a Reissner-Mindlin plate theory in the general case. In the special case of sandwich panels including the chevron pattern, applying the homogenization scheme brings out a skins distorsion phenomenon which affects a lot their shear forces stiffness
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  • HAL Id : tel-00557754, version 2

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Arthur Lebée. Homogénéisation de plaques périodiques épaisses : application aux panneaux sandwichs à âme pliables en chevrons. Mécanique des matériaux [physics.class-ph]. Université Paris-Est, 2010. Français. ⟨NNT : 2010PEST1070⟩. ⟨tel-00557754v2⟩

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