Experimental analysis and modeling of the crushing of honeycomb cores

In the aeronautical field, sandwich structures are widely used for secondary structures like flaps or landing gear doors. The modeling of low velocity/low energy impact, which can lead to a decrease of the structure strength by 50%, remains a designer’s main problem. Since this type of impact has th...

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Main Authors:	Aminanda, Yulfian, Castanie, Bruno, Barrau, Jean-Jacques, Thevenet, Pascal
Format:	Article
Language:	English
Published:	Springer 2005
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://irep.iium.edu.my/6286/ http://irep.iium.edu.my/6286/ http://irep.iium.edu.my/6286/1/applied_composite_2005.pdf

id	iium-6286
recordtype	eprints
spelling	iium-62862012-01-10T11:10:03Z http://irep.iium.edu.my/6286/ Experimental analysis and modeling of the crushing of honeycomb cores Aminanda, Yulfian Castanie, Bruno Barrau, Jean-Jacques Thevenet, Pascal TJ Mechanical engineering and machinery In the aeronautical field, sandwich structures are widely used for secondary structures like flaps or landing gear doors. The modeling of low velocity/low energy impact, which can lead to a decrease of the structure strength by 50%, remains a designer’s main problem. Since this type of impact has the same effect as quasi-static indentation, the study focuses on the behavior of honeycomb cores under compression. The crushing phenomenon has been well identified for years but its mechanism is not described explicitly and the model proposed may not satisfy industrial purposes. To understand the crushing mechanism, honeycomb test specimens made of Nomex™, aluminum alloy and paper were tested. During the crushing, a CCD camera showed that the cell walls buckled very quickly. The peak load recorded during tests corresponded to the buckling of the common edge of three honeycomb cells. Further tests on corner structures to simulate only one vertical edge of a honeycomb cell show a similar behavior. The different specimens exhibited similar load/displacement curves and the differences observed were only due to the behavior of the different materials. As a conclusion of this phenomenological study, the hypothesis that loads are mainly taken by the vertical edge can be made. So, a honeycomb core subjected to compression can be modeled by a grid of nonlinear springs. A simple analytical model was then developed and validated by tests on Nomex™ honeycomb core indented by different sized spherical indenters. A good correlation between theory and experiment was found. This result can be used to satisfactorily model using finite elements the indentation on a sandwich structure with a metallic or composite skin and honeycomb core. Springer 2005 Article PeerReviewed application/pdf en http://irep.iium.edu.my/6286/1/applied_composite_2005.pdf Aminanda, Yulfian and Castanie, Bruno and Barrau, Jean-Jacques and Thevenet, Pascal (2005) Experimental analysis and modeling of the crushing of honeycomb cores. Applied Composite Materials, 12. pp. 213-227. ISSN 0929-189X http://www.springer.com
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 Aminanda, Yulfian Castanie, Bruno Barrau, Jean-Jacques Thevenet, Pascal Experimental analysis and modeling of the crushing of honeycomb cores
description	In the aeronautical field, sandwich structures are widely used for secondary structures like flaps or landing gear doors. The modeling of low velocity/low energy impact, which can lead to a decrease of the structure strength by 50%, remains a designer’s main problem. Since this type of impact has the same effect as quasi-static indentation, the study focuses on the behavior of honeycomb cores under compression. The crushing phenomenon has been well identified for years but its mechanism is not described explicitly and the model proposed may not satisfy industrial purposes. To understand the crushing mechanism, honeycomb test specimens made of Nomex™, aluminum alloy and paper were tested. During the crushing, a CCD camera showed that the cell walls buckled very quickly. The peak load recorded during tests corresponded to the buckling of the common edge of three honeycomb cells. Further tests on corner structures to simulate only one vertical edge of a honeycomb cell show a similar behavior. The different specimens exhibited similar load/displacement curves and the differences observed were only due to the behavior of the different materials. As a conclusion of this phenomenological study, the hypothesis that loads are mainly taken by the vertical edge can be made. So, a honeycomb core subjected to compression can be modeled by a grid of nonlinear springs. A simple analytical model was then developed and validated by tests on Nomex™ honeycomb core indented by different sized spherical indenters. A good correlation between theory and experiment was found. This result can be used to satisfactorily model using finite elements the indentation on a sandwich structure with a metallic or composite skin and honeycomb core.
format	Article
author	Aminanda, Yulfian Castanie, Bruno Barrau, Jean-Jacques Thevenet, Pascal
author_facet	Aminanda, Yulfian Castanie, Bruno Barrau, Jean-Jacques Thevenet, Pascal
author_sort	Aminanda, Yulfian
title	Experimental analysis and modeling of the crushing of honeycomb cores
title_short	Experimental analysis and modeling of the crushing of honeycomb cores
title_full	Experimental analysis and modeling of the crushing of honeycomb cores
title_fullStr	Experimental analysis and modeling of the crushing of honeycomb cores
title_full_unstemmed	Experimental analysis and modeling of the crushing of honeycomb cores
title_sort	experimental analysis and modeling of the crushing of honeycomb cores
publisher	Springer
publishDate	2005
url	http://irep.iium.edu.my/6286/ http://irep.iium.edu.my/6286/ http://irep.iium.edu.my/6286/1/applied_composite_2005.pdf
first_indexed	2023-09-18T20:15:10Z
last_indexed	2023-09-18T20:15:10Z
_version_	1777407739395309568

Experimental analysis and modeling of the crushing of honeycomb cores

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