Discrete modeling of the crushing of nomex honeycomb core and application to impact and post-impact behavior of sandwich structures

Castanie, Bruno and Aminanda, Yulfian and Barrau, Jean-Jacques and Thevenet, Pascal (2012) Discrete modeling of the crushing of nomex honeycomb core and application to impact and post-impact behavior of sandwich structures. In: Dynamic failure of composite and sandwich structures. Solid Mechanics and Its Applications, 192 (192). Springer Science+Business Media Dordrecht, Dordrecht Germany, pp. 427-489. ISBN 9789400753297 (O), 9789400753280 (P)

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Abstract

In this chapter, an original method for modeling the behavior of sandwich structures during and after impact is proposed and validated. It is based on the demonstration that Nomex honeycomb behaves in a post-buckling mode very early and that compression forces are taken up by the corners or vertical edges of the honeycomb cells in the same way as they are in the stiffeners in aircraft structures. Thus it is possible to represent the honeycomb discretely by a grid of springs located at the six corners of hexagonal cells. This approach represents the phenomenon of indentation on honeycomb alone or on sandwiches very well. This approach provides an understanding of how the sandwich and the core behave under compression after impact. An original criterion based on a local core crush is tested and validated to compute the residual strength. To consider the bending response of sandwich structures, a multi-level approach is also proposed.

Item Type:	Book Chapter
Additional Information:	5168/34929
Uncontrolled Keywords:	mpact Sandwich Compression after impact
Subjects:	T Technology > T Technology (General) T Technology > TJ Mechanical engineering and machinery
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Engineering > Department of Mechanical Engineering
Depositing User:	Prof Dr Ing yulfian aminanda
Date Deposited:	30 Jan 2014 10:57
Last Modified:	08 May 2014 11:51
URI:	http://irep.iium.edu.my/id/eprint/34929

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