Contribution à la modélisation du comportement mécanique des structures sandwichs soumises à l'impact

Abstract : This work deals with the modelling of the mechanical behaviour of sandwich structures submitted to impact loadings. It focuses on the study of sandwichs made of composite woven fabric skins and Nomex honeycomb core.

A hypoelastic constitutive law dedicated to composite woven fabrics is developed in local objective referential at the meso scale of the elementary ply. Orthotropy, irreversibilty and strain rate dependence are taken into account. To avoid the localisation phenomena that arises when a softening law is used and that creates spurious mesh dependence, a delayed damage meso model is chosen.

To characterise the response of Nomex honeycomb core, experimental tests are performed on classical compressive specimens and on quad-blocs shearing specimens. A detailed numerical study highlights the effects of the free edges, the interfaces and the structure. It gives hints on how to improve the tests.

The mechanical behaviour of Nomex honeycomb core is then modelled and special care is paid to the non linear response in out of plan compression. Coupling damage and plasticity, enables the model to deal with the whole response in an integrated fashion.

Last, simulations of impacts on sandwich plates conclude the work.
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Contributor : Steven Marguet <>
Submitted on : Monday, May 26, 2008 - 5:20:50 PM
Last modification on : Monday, March 25, 2019 - 4:24:08 PM
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Steven Marguet. Contribution à la modélisation du comportement mécanique des structures sandwichs soumises à l'impact. Mécanique [physics.med-ph]. Ecole Centrale de Nantes (ECN), 2007. Français. ⟨tel-00276946v2⟩

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