Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins

In the aircraft industry, manufacturers have to decide quickly whether an impacted sandwich needs repairing or not. Certain computation tools exist at present but they are very time-consuming and they also fail to perfectly model the physical phenomena involved in an impact. In a previous publicatio...

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Main Authors:	Castanie, Bruno, Bouvet, Christophe, Aminanda, Yulfian, Barrau, Jean-Jacques, Thevenet, Pascal
Format:	Article
Language:	English
Published:	Elsevier 2008
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://irep.iium.edu.my/6282/ http://irep.iium.edu.my/6282/ http://irep.iium.edu.my/6282/1/IJIE_Article_final.pdf

id	iium-6282
recordtype	eprints
spelling	iium-62822012-01-10T11:14:55Z http://irep.iium.edu.my/6282/ Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins Castanie, Bruno Bouvet, Christophe Aminanda, Yulfian Barrau, Jean-Jacques Thevenet, Pascal TJ Mechanical engineering and machinery In the aircraft industry, manufacturers have to decide quickly whether an impacted sandwich needs repairing or not. Certain computation tools exist at present but they are very time-consuming and they also fail to perfectly model the physical phenomena involved in an impact. In a previous publication, the authors demonstrated the possibility of representing the NomexTM honeycomb core by a grid of nonlinear springs and have pointed out both the structural behaviour of the honeycomb and the influence of core-skin boundary conditions. This discrete approach accurately predicts the static indentation on honeycomb core alone and the indentation on sandwich structure with metal skins supported on rigid flat support. In this study, the domain of validity of this approach is investigated. It is found that the approach is not valid for sharp projectiles on thin skins. In any case, the spring elements used to model the honeycomb cannot take into account the transverse shear that occurs in the core during the bending of a sandwich. To overcome this strong limitation, a multi-level approach is proposed in the present article. In this approach, the sandwich structure is modelled by Mindlin plate elements and the computed static contact law is implemented in a nonlinear spring located between the impactor and the structure. Thus, it is possible to predict the dynamic structural response in the case of low-velocity/low-energy impact on metal-skinned sandwich structures. A good correlation with dynamic experimental tests is achieved. Elsevier 2008-07 Article PeerReviewed application/pdf en http://irep.iium.edu.my/6282/1/IJIE_Article_final.pdf Castanie, Bruno and Bouvet, Christophe and Aminanda, Yulfian and Barrau, Jean-Jacques and Thevenet, Pascal (2008) Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins. International Journal of Impact Engineering, 35 (7). pp. 620-634. ISSN 0734-743X http://www.elsevier.com/locate/ijimpeng
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Castanie, Bruno Bouvet, Christophe Aminanda, Yulfian Barrau, Jean-Jacques Thevenet, Pascal Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins
description	In the aircraft industry, manufacturers have to decide quickly whether an impacted sandwich needs repairing or not. Certain computation tools exist at present but they are very time-consuming and they also fail to perfectly model the physical phenomena involved in an impact. In a previous publication, the authors demonstrated the possibility of representing the NomexTM honeycomb core by a grid of nonlinear springs and have pointed out both the structural behaviour of the honeycomb and the influence of core-skin boundary conditions. This discrete approach accurately predicts the static indentation on honeycomb core alone and the indentation on sandwich structure with metal skins supported on rigid flat support. In this study, the domain of validity of this approach is investigated. It is found that the approach is not valid for sharp projectiles on thin skins. In any case, the spring elements used to model the honeycomb cannot take into account the transverse shear that occurs in the core during the bending of a sandwich. To overcome this strong limitation, a multi-level approach is proposed in the present article. In this approach, the sandwich structure is modelled by Mindlin plate elements and the computed static contact law is implemented in a nonlinear spring located between the impactor and the structure. Thus, it is possible to predict the dynamic structural response in the case of low-velocity/low-energy impact on metal-skinned sandwich structures. A good correlation with dynamic experimental tests is achieved.
format	Article
author	Castanie, Bruno Bouvet, Christophe Aminanda, Yulfian Barrau, Jean-Jacques Thevenet, Pascal
author_facet	Castanie, Bruno Bouvet, Christophe Aminanda, Yulfian Barrau, Jean-Jacques Thevenet, Pascal
author_sort	Castanie, Bruno
title	Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins
title_short	Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins
title_full	Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins
title_fullStr	Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins
title_full_unstemmed	Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins
title_sort	modelling of low-energy/low-velocity impact on nomex honeycomb sandwich structures with metallic skins
publisher	Elsevier
publishDate	2008
url	http://irep.iium.edu.my/6282/ http://irep.iium.edu.my/6282/ http://irep.iium.edu.my/6282/1/IJIE_Article_final.pdf
first_indexed	2023-09-18T20:15:10Z
last_indexed	2023-09-18T20:15:10Z
_version_	1777407739096465408

Modelling of low-energy/low-velocity impact on Nomex honeycomb sandwich structures with metallic skins

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