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Entropy 2014, 16(5), 2869-2889; doi:10.3390/e16052869
Article

A Maximum Entropy Approach to Assess Debonding in Honeycomb aluminum Plates

* ,
 and
Department of Mechanical Engineering, Universidad de Chile, Beauchef 850, Santiago, Chile
* Author to whom correspondence should be addressed.
Received: 22 March 2014 / Revised: 12 May 2014 / Accepted: 21 May 2014 / Published: 23 May 2014
(This article belongs to the Special Issue Maximum Entropy and Its Application)
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Abstract

Honeycomb sandwich structures are used in a wide variety of applications. Nevertheless, due to manufacturing defects or impact loads, these structures can be subject to imperfect bonding or debonding between the skin and the honeycomb core. The presence of debonding reduces the bending stiffness of the composite panel, which causes detectable changes in its vibration characteristics. This article presents a new supervised learning algorithm to identify debonded regions in aluminum honeycomb panels. The algorithm uses a linear approximation method handled by a statistical inference model based on the maximum-entropy principle. The merits of this new approach are twofold: training is avoided and data is processed in a period of time that is comparable to the one of neural networks. The honeycomb panels are modeled with finite elements using a simplified three-layer shell model. The adhesive layer between the skin and core is modeled using linear springs, the rigidities of which are reduced in debonded sectors. The algorithm is validated using experimental data of an aluminum honeycomb panel under different damage scenarios.
Keywords: Sandwich structures; debonding; honeycomb; damage assessment; maximum-entropy principle; linear approximation Sandwich structures; debonding; honeycomb; damage assessment; maximum-entropy principle; linear approximation
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Meruane, V.; Fierro, V.D.; Ortiz-Bernardin, A. A Maximum Entropy Approach to Assess Debonding in Honeycomb aluminum Plates. Entropy 2014, 16, 2869-2889.

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